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Mathematics Questions and Answers December 03, 2021

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Which of the following uses a brokerage model? Question 8 options: a) Dell b) Yahoo! c) Tradestation d) The DAO Hub

The statistical tests used in these analysesvaried from very simple two-group t tests orbivariate correlations to complex multiple-regression and structural equation models.Because some of the variables areintercorrelated and issues of mediation,moderation, suppressor effects, andinteraction terms are likely, the mostsophisticated statistical

As the new chief administrator for a large social service agency, one of your goals is to equalize workloads within the various departments. You have gathered data on caseloads per employee in each department. \f
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1A) A study is conducted of whether students with fewer extracurricular activities have a higher GPA than students in general. Explain what the Type | and Type II error would be in this study. (Be sure to state your answer in terms of the variables of this particular study.) 1 B) If you set a stringent significance level (e.g., .0001), what is the
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ID injections are given at a 15-degree angle. ID injections are given at a 15-degree angle. True False

Select the correct choice that completes the sentence below. Experiments done without replacement will result in dependent compound independent mutually exclusive events

I'm looking for the correct way to do the graphs for each one. Normal Curve (using the Z/Normal Chart) Please make aseparate sketch foreachquestion!!. Put all of the information and answers on your pictures (percents inside the curve, z-scores under the curve, mean and raw scores under the curve...). A. (determining exact percentages, not

3. (8 points) Suppose you get sick this weekend, and you are worried you have COVID. Based on your lifestyle, the overall probability you have COVID is .02 (2% chance). a) You get a rapid test from the pharmacy which is 95% accurate. Your test result is positive. Given this positive test result, what is the probability you have COVID? b) You
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Which of the following statements are true? Mark all that apply. Hint: treat each one as it's own true/false statement, not like they're connected. Which of the following statements are true? Mark all that apply. Hint: treat each one as it's own true/false statement, not like they're connected. Sample mean is represented by the Greek letter mu.

True or False? LES allows for an estimate of the level and trend of the data. Group of answer choices Tru

Consumers were surveyed on the relative number of visits to a Sears store (often, occa-sional, and never) and if the store was located in an enclosed mall (yes and no). When variables are measured nominally, such as these data, the results are usually summarized in contingency table. (10 marks ) i. Are the number of visits and enclosed mall

In 2005, Health Canada claimed that 16.8% of Canadian adults are obese. A researcher wanted to check whether this percentage has increased in 2009. He randomly selected 205 Canadian adults and found 43 of them are obese. Write down lower value for 93% confidence interval for percentage of Canadian adults with obesity. Example, if the CI is

Six customers enter a three-floor restaurant. Each customer decides on which floor to have dinner. Assume that the decisions of different customers are independent, and that for each customer, each floor is equally likely. Find the probability that exactly one customer dines on the first floor.

Question:: A botanist is studying a newly identified soybean disease. The botanist collected soil samples from all of the soybean fields in randomly selected states to see if there were significant differences the sulfur levels in fields with and without the disease. 1)What is the population? a)all US botanists b)all US diseases c)all US soil

The half-life of a radium is 1690 years. If 90 grams are present now, how much will be present in 280 years?

Use the following information to find the best predicted value for y given x = -5.47 m =5.32b = -12.48 Assume that the variables x and y have a significant correlation. The minimum value of x in the data set is -4.99. The maximum value of x in the data set is -0.97. Do not round your answer. Show work .If the value is not meaningful,then you

A hypothesis test is performed, and P= 0.033 Which of the following is the best conclusion? is rejected at the level. is rejected at the level. is rejected at the level. is rejected at the level

How do spreadsheets assist during the iNterpret stage of data analysis? 1 point Spreadsheets allow analysts to create complex machine-learning models for predictive analysis. Spreadsheets automatically collect raw data from primary sources. Spreadsheets facilitate data extraction from external databases. Spreadsheets offer built-in functions to

The data set below represents the heights (in inches) of students in a particular high school class: 73, 78, 70, 75, 68, 72, 71, 67, 71 What will happen to the median if a new student who is 48 inches tall joins the class? The median will be a larger value and may no longer be a good measure of center. The median will be a smaller value and may no

7. An investment counselor, Anna Lynn, wonders if the Metals fund is significantly riskier than the Income Jnd. She randomly selected 10 investors ( 11.} of buying Metals fund and 12 investors (11,} of buying Income fund. The average return of Metals fund (id is 24.65% while the average return of Income fund {fl} is 8.51%. In addition, the
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Evidence obtained during the booking process is lawful so long as the _______________ is lawful

When is the analysis of variance (ANOVA) statistical test necessary instead of a t test? Compare an ANOVA with a t test and provide an example of each.

Consider selecting one ball at a time from a box which contains 10 red, 6 yellow and 4 blue balls. What is the probability that the first ball is red and the second ball is also red? Express the probability in fraction format. (Show all work. Just the answer, without supporting work, will receive no credit.) (a) Assuming the ball selection is

1. Set up both the dx and dy integrals representing the area in the first quadrant between the curves y = 2.y =15 - 2x, and x = 2. (You do not have to solve either integral.) 1 + 3x V9x2+1 2. Evaluate dx o 3x + 9x2 +1
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If the raw score is seventy the average seventy-five and the standard deviation is three what the probability that someone will score less than 70

what factors should I include in my survey (regressional analysis)

What does the absolute zero point of ratio variables represent? (Re: Provide an Example of Nominal, Ordinal, Interval, and Ratio Levels of Measurement) a. An arbitrary starting point b. The midpoint of the scale c. The highest value on the scale d. A total lack of the quantity measured

Multiple Select Question Select all that apply Three areas of concern in forecasting include Multiple select question. demand estimation excludes important variables. data is missing the functional form yields significant estimates the structure of the estimation changes confidence intervals can increase as forecast go farther out in time

A civil engineer is analyzing the compressive strength of concrete. Compressive strength is approximately normally distributed with variance of 1000 psi^2. A random sample of 12 specimens has a mean compressive strength (xbar) of 3255.42 psi

Describe a scenario in which you explain what the raw scores are for an event or situation and then state what z score you would personally like to have for that scenario. The scenario can be grounded in reality or totally fictional. Be sure to visualize the normal distribution and the corresponding percentile ranks when deciding what a desirable

We counted the number of people who entered our store across the span of a week in the morning, afternoon, and evening. What is the simplest test to see if there is any difference in the frequency of people coming to our store at different times across days? Please pick one of the below answers. The correct answer is one of the following options:

When volunteers are put into experimental conditions in such a way that each person is equally likely to be put into any of the conditions the procedure is called random assignment random selection. accidental assignment accidental sampling

Look at North Carolina's local K-12 school divisions and provide an interesting local funding statistic supported by a source

Which of the following interpretations of the mean is correct? A. The observed value of an experiment will be equal to the mean of the random variable in most experiments. B. The observed value of an experiment will be less than the mean of the random variable in most experiments. C. As the number of experiments increases, the mean of the

1. A manufacturer of skateboard wheels purchases ball bearing from their supplier in 2 kg and 4kg containers. The quality of the ball hearings in n 2 kg containers and m 4kg containers were assessed to ensure that they meet the necessary specication for man- ufacturing wheels. Let the independent random variables X1, . . . 1X\" and 1/1.... ,Ym
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A local elementary school offers a morning kids' camp that runs from 9 a.m. until noon Monday through Friday. The camp director would like to know if evening camps would be better attended by the children in the community than morning camps. Upon pickup, a random sample of parents was asked, "Do you prefer morning camp hours (9 a.m.-noon) or would

A convenience store needs to make a decision of how many packages of California rolls prepare for tomorrow. A package of California rolls cost the store $2.00 and it sells for $6.00. Daily demand is normally distributed with a mean of 100 packages of California rolls and a standard deviation of 40 packages of California rolls. If there are

Suppose we conduct a two-step hierarchical regression analysis. The p-value associated with the ANOVA statistic at Step 2 is .305. What can we conclude from these results? The full model is statistically significant. The full model is not statistically significant. The full model explains 31% of the variation in the dependent variable. The

the distribution of hourly wages in the USA is skewed right. Can the 68-95-99.7% rule(also know as the empirical rule) be used with this distribution? 1 yes, the rule can be used with bell-shaped data 2 yes, the rule only applies to skewed data 3 no, the rule does not apply to bell-shaped data 4 no, the rule canot be used with skewed data

Extraneous Variables This happens to be part of the unwanted influences, and the design that I plan to use in research question should eliminate this unwanted influence. The extraneous variables are the variables that are likely to interfere with independent variable actions. These extraneous variables are not part of the research study and

can i get an introduction for this assignment In this course you will conduct a mini study. You will survey 50 people through any method you choose to find out information on your topic. You will then calculate the statistics for your data. It is important to remember your mini study should use quantitative values since this is a statistics course

Compare how sample size and population size effect sample mean distribution. Provide evidence and examples to support your claims

John is a driver and his weekly income depends heavily on the weather condition. Assume each day can be classified as Rainy Day (20%) or non-Rainy Day (80%) and each day's weather is independent. John checks his past delivery history and estimates that he can earn 150 dollar on a rainy day but earns half the amount on a rainy day what is his

Open spreadsheet a. Compare the firstplace finish times for men anditisneith the men and w s Fall competed is one group, in what place would winner of women's marathon have finished? Round voul answer to e decimal clad The Just place runner in the men's group finished EFEC HITHIS mimites Ehead wv w of the first plank runner in the women's group.
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The IT characteristic "the more the merrier" means __________________. A. an increase in the number of students results in a significant rise in the value of the good or service B. an increase in the number of participants results in a significant rise in the value of the good or service C. an increase in the number of entrepreneurs results in a

The following table show the results from a famous social experiment in the U.S. on recidivism for criminals who were convicted and later released from prison (Rossi, Berk, and Lenihan, AJSVol 88 No 2, September 1982).Recidivism reflects whether or not they were rearrested after being released.The treatment is the study was whether or not the
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Scenario: Is there a relationship between worker type (X) and productivity (Y)? The researcher defined worker type (X) as blue or white collar, and productivity (Y) as "high" or "low". Question: What is the most appropriate statistical test to conduct given this scenario? Group of answer choices Pearson's r correlation Chi Square Test of

A company has developed a new insect repellent and wants to determine how long each application will be effective. A study of 40 applications of the repellent shows that the effective time for each application has a mean of 10.5 hours and a standard deviation of 1.8 hours. Can we use the Central Limit Theorem to describe the sampling distribution

(Please provide a breakdown and describe/show step by step details on how you arrived the answers so I can learn - thanks) QUESTION: The Chili's Restaurant chain wants to test if their "Meal For Two" program increases customer traffic enough to support the cost of the program. For each of 15 stores, one day is selected at random to record customer

An archaeologist is uncovering the graves of an ancient civilization. He finds that some people were buried with small statues. The table below is a summary of his data. Statue No statue Male 85 54 Female 60 38 Explore this data to determine if there is an association between gender and burial practice. You will get marks for showing calculations

I am writing a proposal paper and am on the methods section. My mock research study is on the affects of gut health on mental health (specifically the affects of paleo diet with fermented foods on depression and anxiety). I have chosen to used stratified random sampling (strata being: depressed individuals, anxious individuals, individuals with

Explain how data collection procedures, pre-surveys and post-surveys will be implemented, including a timeline for data collection activities. Discuss any potential obstacles to data collection, including supporting details or specific examples

The mean value of a measurement refers to the __________. Question 16 options: A) sampling error of the measurement B) average of the measurement C) the alternative facts of the measurement D) standard error of the measurement E) sample size of the measurement

A medical study found a negative relationship between exercise (in minutes per week) and stress-related heath problems (r = 0.35). Which of the following conclusions is appropriate? Explain why the other is not appropriate. (a) 12.25% of the variance in stress-related health problems can be explained by the amount of weekly exercise. (b)

explain 2 possible sources of bias and a way to help avoid creating each type of bias when creating surveys or performing studies.

Probability is expressed as a. a decimal c. a percent b. a fraction d. any of the above In a probability experiment to simulate an event such as the gender of a baby, what you would use? a. a sixsided die c. a spinner with 3 equal sectors b. a coin d. none of the above If something is certain, the probability is a. l b. 1 c. 2 d. 1000 2 A bag has
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Which approach would be most appropriate for testing the hypothesis that studying for an hour each night in the days leading up to a test will yield a higher score than only studying the night before a test

You are betting on a game in which each bet has an expected value of -$0.38. This means that... If you play the game many times, on average you will have won about 38 cents per game If you play the game many times, on average you will have lost about 38 cents per game You will win 38 cents every time you play You will win 38 cents every time you

When comparing population aging on a global level, which demographic measure is not typically used to compare countries? Average life-expectancy The number of people over age 65. The ratio of men vs women. The percentage of the population over ages 65 or 75

In 2005, Health Canada claimed that 16.7% of Canadian adults are obese. A researcher wanted to check whether this percentage has changed in 2009. In 2009, he randomly selected 165 Canadian adults and found 24 of them are obese. Use a 4% significance level. The decision rule is

pick which answer exposed credit loss is calculated as chance of defualt x loss given default, chance of default x2-score, chance of defualt x total sefk, chance of defualt x maket value of equaity

Mach each of the following ANOVA df values with the correct formula. 1 2 3 4 5 6 7 df numerator (as it's called in the critical value calculator) df within df totall df denominator (as it's called in the critical value calculator) df between

A researcher theorizes the correlation between age and driving violations is zero in the population of adults. Another researcher decides to test this theory. She believes there is a correlation, but she is not sure of the direction. She collects data from a sample of 62 individuals and finds a correlation of .20. Use this information to answer

When an event's probability depends on the occurrence of another event, the probability is a(n) ___________? Wrong Answer: conditional probability Answers: empirical probability joint probability posterior probability conditional probability

Calculate probabilities of exact number of successes. Number of Trials 22 (N) Pls show excel formula too. Number of Success (P) Probability of Success (X) 0.999999998 1 2 3 4 5 6 7 8 9 10

in a one-way anova, the outcome (dependent) variable can be what type of variable

The sampling distribution for an independent-sample t test is a distribution of the differences between ______. Group of answer choices a population mean and the means of the two groups in our study sample and a population mean the means of the two groups in our study the population means for the two groups in our study

Describe your proposed study's target, source, and sample population. Describe the sampling method and process you will use for your proposed study. Use the sample size calculator(new tab) and determine the sample size required for your proposed study. Describe the method and questionnaire or survey you will use to collect data for your proposed

Using a TI-84 calculator, find the area under the standard normal curve to the left of the following z The area to the left of z= 1.58 is E]. 111e area to the left of z=0.22 is E]. The area to the left of z=-0.37 is D. 111e area to the left of z=-0.12 is D
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with 90% confidence for sample mean 331.50 sample standard deviation 13.40 and sample size 35, what is the upper confidence limit with 2 decimal places

Choco-Chippy Cookie Company has two different manufacturing plants. Company officials want to test whether each plant fills the bags with the same number of ounces. A random sample of cookie bags from plant A had a mean of 24.2 ounces in each bag. A random sample from plant B had a mean of 22.2 ounces. They randomized the data over 100 trials, and
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help with questions (c) Determine the linear correlation coefficient between compensation and stock return. r= (Round to three decimal places as needed.) (d) Does a linear relation exist between compensation and stock return? Does stock performance appear to play a role in determining the compensation of a CEO? The linear correlation coefficient
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It is claimed that the average amount of time boys and girls (age between 7 and 11) spend playing each day is the same. A child psychologist believes that boys, on average, spend more time playing sports than girls. He randomly selected 35 girls and 95 boys and observed their play time on sports. From his samples he found that girls have spend on

DTSC 560 Data Science for Business Module 5 Assignment: Logistic Regression Analysis This material is for enrolled students' academic use only and protected under U.S. Copyright Laws. This content must not be shared outside the confines of this course, in line with Eastern University's academic integrity policies. Unauthorized reproduction,
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Using the TI-84 calculator, find the area under the standard normal curve that lies between the following z -values. Round the answers to four decimal places. Using the TI-84 calculator, find the area under the standard normal curve that lies between the following z-values. Round the answers to Four decimal places. (a) Find the area under the
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(5) [BA || Plus calculator desirable] Sean and Karl each borrowed an identical amount from their parents at an annual effective rate of interest of 5%. Sean repays his loan by making monthly payments at the end of each month for eight years. For the rst four years these monthly payments are each $200 and for the next four years they are each $500.
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I need a statistical analysis of the pre- and post-survey data for a quality improvement initiative I completed for my doctorate project. Including, but not limited to: Qualitative and quantitative analysis, descriptive analysis, details of process measures and outcomes.

For both ANOVAs and correlations, which of the following are always true if you correctly reject the null hypothesis? your calculated value has a larger absolute value than the critical value you can make a claim about one variable causing changes in another there is less than a 5% chance that your results are by chance you have found significant

Use frequency tables for the variable \"Parnt2\" to calculate the variance and standard deviation for this measure. The mean for this measure is 6.23. Standard Deviation: 1.383 Variance: 1.292 Using a frequency table and the procedures outlined for calculating the variance and standard deviation for grouped data, calculate the standard deviation
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Why does the denominator of sigma with hat on top subscript 2 need to be N-K (and not N)? a. so we will know how the estimate is distributed if H subscript 0 is true b. so we can extrapolate the results to other values of x c. so that the root MSE will be a positive number d. so the estimator will be unbiased

Summarize the statistical findings for the article, Tandberg, B. S., Frslie, K. F., Flacking, R., Grundt, H., Lehtonen, L., & Moen, A. (2018). Parent-infant closeness, parents participation, and nursing support in single-family room and open bay NICUs. The Journal of Perinatal & Neonatal Nursing, 32(4), E22-E32.

The profiling data approach is associated with diagnostic analytics. True false question. True False

Consider the "height-for-age" data below: Table 3: Height for age data Age in Years 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 Height in cm 102 107 112 116 121 126 130 136 143 149 154 158 161 162 163 a) Make a scatter plot of the data. [1] b) Find the least square regression line and add it to the scatter plot in Question 6 a). [3] c) Find the

T st @ Question e e B e it Suppose the true proportion of voters in the county who support a specific candidate is 0.56. Consider the sampling distribution for the proportion of supporters with sample size n = 90. What is the mean of this distribution? i} What is the standard error (i.e. the standard deviation) of this sampling distribution,
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There are 13,011 eligible voters in one town. In a poll of 827 eligible voters from thistown, the proportion who say that they plan to vote in the next mayoral election is 0.47. Based on that samplestatistic, what is the best estimate of the proportion for all eligible voters in thetown? Please provide step by step

Find each of the shaded areas under the standard normal curve. Round the answers to four decimal places. \f
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The result of computing a linear correlation coefficient when a somewhat curvilinear relationship exists will be a(n) O reasonable estimate of the relationship. O spuriously high index of relationship. O underestimation of the relationship. O zero correlation coefficient

15. (8 marks) Let A := 1 where r is some constant. By applying suitable ERO's, transform A into a row echelon matrix and determine its rank. Hence, find all values of r so that A is invertible
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fine the equation of the line that contains give points P1( 7,2) P2 (7,-8)

What are top three personal strengths as someone who is interested in doing socail work ,Include at least one example of how those personal strength can help the person to achieve a goal in life . Name one learning goal to pass a Math class and one overall semester goal as a student at a university . Discuss what it would mean to pass Math class

Unlike classical probability, this type of probability uses actual observations, such as the number of times an event has occurred in the past week: Group of answer choices Relative Frequency Assessment Subjective Probability Assessment Objective Probability Assessment Stratified Probability Assessment

The Data: (40) De Anza students were asked how many movies (at the movie theatre) they saw in March. The data is summarized in the table below (om Chapter 1 Project). Number of Movies Relative Cumulative Relative Frequency 0.3000 0.3000 0.2250 0.5250 0.1750 0.7000 0.1250 0.8250 0.1000 0.9250 0.0000 0.9250 0.0250 0.9500 0.0500 1.0000 G H M mm GNU]
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6 A data analyst obtains data from two sources to begin their analysis. What criteria should they use to check the data's validity? Select all that apply. 1 point The data is gathered from a small sample The data is accurate The data is objective The data comes from a credible source

The prices of various cereal boxes is normally distributed with a standard deviation of 0.5. If a box of lucky charms sells for $4.29 and has a z-score of 1.6, what is the mean price of a box of cereal?

Data that have an approximately normal distribution are characterized by a frequency distribution that starts low, increases to one or two high frequencies, then decreases to a low frequency. Also, the frequencies are relatively symmetric about the maximum frequency

1. Identify the correct hypothesis test (chi square, t test, ANOVA, correlation, or regression) you would use to examine the following relationships: [3.0pts] Potential Study Measured as: Test? a IV: Age DV: Arrest IV: Number of Years DV: Number of Arrests Click or tap here to enter text. b IV: Gender DV: Sentence Length IV: Male or Female DV:

Match the purpose of the study with the appropriate research design below." The purpose of this study was to determine if a group of men with pancreatitis and another without pancreatitis had regular alcohol intake" Group of answer choices: Case control design retrospective study Descriptive research Correlational study Prospective study

Compare and contrast dependence and interdependence techniques. List the statistical techniques for both.

I can NOT see any files please put the answer in the text box :) The lengths of pregnancies in a small rural village are normally distributed with a mean of 261 days and a standard deviation of 16 days. In what range would we expect to find the middle 50% of most lengths of pregnancies? Round the answer to one decimal place. Between and days
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