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Mathematics Questions and Answers October 18, 2019

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When field data is plotted on a graph, what could a decreasing failure rate curve indicate? O Random failures Sabotage O Latent defect failures O Wear out failures

Researchers want to determine the proportion of trees in a city that need to be removed. A random sample of 607 trees in the city is chosen and it is determined that 159 trees must be removed. Determine the sample proportion for this situation. Round your answer to four decimal places. , where represents population proportion the sample proportion

For ln(time) = -1.04 (25th percentile): Hazard ratio = e^(0.14 + (-0.88) * (-1.04)) = e^(0.14 + 0.9152) = e^1.0552 2.87 (not 2.48, there seems to be a calculation error here) For ln(time) = 0.104 (50th percentile): Hazard ratio = e^(0.14 + (-0.88) * 0.104) = e^(0.14 - 0.09152) = e^0.04848 1.05 (correct) For ln(time) = 0.443 (75th percentile):

a population has a normal distribution. A sample of size n is selected from this population. Describe the shape of the sampling distribution of the sample mean for each of the following cases: a. n=94 b. N=11 Can someone please solve this and show step by step how it was solved. Thank You,

Differentiate the following two visualization techniques (Viz 1, andViz 2)? When would it be used? Viz 1

Section One Define and give an example of the following types of sampling: Simple Random Sampling Systematic Sampling Stratified Sampling Disproportionate Stratified Sampling Multistage Cluster Sampling Multistage Cluster Sampling with Stratification Define and give an example of the following types of modes of observation: Survey Research

The mean incubation time of fertilized eggs is 20 days. Suppose the incubation times are approximately normally distributed with a standard deviation of 1 day. Determine the 11% for incubation times. Determine the incubation times that make up the middle 39%

A researcher is interested in whether using personal pronouns in emergency warnings would be more effective during an emergency. 56 participants were presented with a written emergency warning for an upcoming category 4 hurricane. The first group (n=27) received the written warning with the personal pronoun of "you" (e.g., "You should seek a

Project description: The assignment for this project is to pose an interesting statistical question that can be researched or developed; collect a relevant data set (using the links below); and use the data, in conjunction with the tools we have learned in this class, to answer the question you have posed. Make sure to talk about any uncertainty

Compute the mean age, rounding to the nearest whole number for the participants in the provided data set. Age 21 GPA 3.4 age 22 GPA 3.4 age 21 GPA 3.7 age 23 GPA 3.5 age 42 GPA 3.2 age 44 GPA 3.1 age 29 GPA 3.0 age 21 GPA 3.0 age 33 GPA 4.0 age 34 GPA 3.7 age 27 GPA 3.8

on trail ridge road in rocky mountains national park,1 out or every 60 hours the road is closed due to sustained gale-force winds. you observe the road for 108 hours. what is the probability the road is closed 2 times? what is the probabilty the road is closed at least 1 time?what is the probabilty the raod is closed less than 5 times

Jose has a new test that has three steps. He calculates that in each step some of the sample must be discarded. Step 1 has a discard rate of 2%, step 2 has a discard rate of 5% and step 3 has a discard rate of 1%. How much of the sample is available after step 3? 86.5% 99.1% 82.0% 75.5%

During the Final Four, demand for basketball jerseys is uniformly distributed with minimum demand a = 200 and maximum demand b = 700. Each jersey costs $30. The selling price is $50 per jersey. How many jerseys should be ordered to maximize expected profits

Rates of violence against disabled adults are nearly ____________ than those of non-disabled adults. Question 1 options: 10 times higher 4 times higher 100 times higher Rates are about the same

York U want to offer test prep programs for taking math tests. They test the effect of the difference in average exam scores for students from two different schools? What kind of statistical test should be run? a. Repeated Measures ANOVA b. two sample t-test c. paired t-test d. one sample t-test e. Between-subject ANOVA

The table accompanying this example shows the result of a survey of alcohol and tobacco consumption by secondary school students from Daytona, Ohio. a) State the conditional distributions of tobacco consumption, otherwise on the one hand those who consume alcohol and on the other hand them who do not consume alcohol. Compare and interpret. Now it

A random sample of n = 77 data items hasx = 105 and s = 24. What is the 80% confidence interval estimate of ?

1. Researchers want to test whether an Indian child's school grades are influenced by his or her caste. They believe graders simply take 10 points off the score of an exam written by a student belonging to a lower caste. In order to test this hypothesis, they obtain the scores of children of higher and lower castes, on a test on which children are

A lock combination is made up of 3 numbers chosen from the number 0 to 30. How many combinations can be created that start with the number 10?

Consider all bit strings of length 12. b) How many have exactly four 1's?

A professor is studying exam scores. As part of the study, the professor takes a sample of 25 exams and records the score. The data appear in the Exams worksheet of the Chp 11 HW Problems data workbook on Moodle. a) State the Hypothesis to show the variance in exam score is different than 64. b) Choose a level of Use = 0.05 for this problem. c)

Question 2: Confounding and Interaction (24 points) From the summary table below, suggest whether there is presence of confounding and interaction, no confounding, and no interactions, or confounding and no interactions. Example Study (Effect Measure) Adjusted vs. Crude Stratum 1 Estimate Stratum 2 Estimate Crude Estimate 1 Longitudinal (RR) 1.02

After some consideration, the CEO of ABC Enterprises determined that the mean meal expenditure for the population is really about 56 dollars per day. Accountant X in ABC Enterprises has been collecting receipts from the company's travelers, and 56 dollars "felt wrong" to her. She had receipts from 18 employees on her desk. Upon averaging them, she

We can be 95% confident that the true difference in mean RDI levels between men and women with traumatic brain injuries is contained within the bounds of the interval above. Choice 1 of 2: incorrect Choice 2 of 2: correct

What would the histogram look like that matches this frequency table

approximately normally distributed with mean 5.11 ounces and standard deviation 0.062 ounce. Round to 4 decimal places, if neccessary. a) What proportion of the baseballs produced by this factory are too heavy for use by major league baseball? b) What proportion of the baseballs produced by this factory are too light for use by major league

Determine whether the correlation coefficient is an appropriate summary for the scatter plot and explain your reasoning.

View the video and read the article at the Australian Bureau of Statistics website (http://www.abs.gov.au/websitedbs/a3121120.nsf/home/statistical+language+-+correlation+and+causation). A school district found that the number of absences in a school increased with the decrease in temperatures. When a correlation coefficient between absences and

Follow these steps: Think about a life experience that involved probability and share it by posting it to this discussion. Within your post, you must identify the approach to probability that is relevant to your experience. Reply to a post that you found interesting, could relate to, or found surprising. Here is an example of a post: I have to

Please help I have covid!!!!! This week, we learned about correlations. For the discussion board this week: 1) Read the journal article Correlation Does Not Imply Causation. 2) Discuss why correlation is not the same as causation. 3) Provide an example that would demonstrate that correlation is not the same as causation (Don't use the murder rates

Give an example of a confidence interval for the mean of a population when you know the population standard deviation by describing the population, the variable, and how you would go about finding the interval. You may want to mention a sample size, a confidence level, and a possible interval.

A researcher has repeated the same study 10 times. Each time the study is repeated, the p value decreases. As the p value approaches zero, the size of the sample increases. chance that the results are due to a sampling error decreases. value of the study decreases. chance that the results are due to a sampling error increases.The name given to the

Assignment Guidance: In the Excel document, you will find the 2018 data for 17 cities in the data set Cost of Living. Included are the 2018 cost of living index, cost of a 3-bedroom apartment (per month), price of monthly transportation pass, price of a mid-range bottle of wine, price of a loaf of bread (1 lb.), the price of a gallon of milk and

Summarize the stem and leaf graphs (stemplots), line graphs and bar graphs with the help of diagrams or graphs

A manufacturer of game controllers is concerned that its controller may be difficult for left-handed users. They set out to find lefties to test. About 12% of the population is left-handed. If they select a sample of 8 customers at random in their stores, what is the probability of each of the outcomes described in parts a through f below? 1.

Suppose a math class contains 29 students, 11 females (three of whom speak French) and 18 males (two of whom speak French). Compute the probability that a randomly selected student speaks French, given that the student is male.

In a randomized, controlled study of pre-emptive analgesia in men who underwent radical prostatectomy surgery, functioning was statistically (alpha=0.05) and clinically significantly improved in men who received the experimental treatment compared with men who received usual care. Which one of the following can be said about the assessment of

Calculate and state a 1% value of the stock on day 1. Determine the probability for the daily stock change of: the value of the stock decreasing by 1%. (X < 1% of the value of the stock) the value of the stock increasing by 1%. (X > 1% of the value of the stock) Explain if these are high or low likelihoods for change.

From the following stem and leaf plot, determine the distribution of the dataset. Stem Leaf 0 4 1 8 9 2 3 4 6 3 1 2 3 4 5 5 7 9 4 0 0 2 4 Question 21 options: a) Normal distribution b) Unable to determine c) Negatively skewed distribution d) Positively skewed distribution

Pick the best choice as it applies to standard statistical inference. PROPOSITION ONE: Alternative hypotheses cannot be proven because Type One Errors exist; PROPOSITION TWO: Alternative hypotheses cannot be proven because Type Two Errors exist

What is the purpose of public opinion polling? What is the proper use of public opinion polls? Are public opinion polls accurate? Does it depend on the way a survey is conducted? Please explain. Why are some polls wrong

The Wall Street Journal reported some interesting statistics on the job market. One statistic is that 40% of all workers say they would change jobs for "sliguhtly higher pay. Suppose 16 workers are randomly selected and asked if they would change jobs for "slightly higher pay." -Answer the following questions by using Table. (40 points) What is

A jar contains 20 jellybeans: 4 are red, 6 are green. and the rest are yellow. If one jellybean is selected at random, what is the probability that it is yellow

Make a histogram, using your graphing calculator. Let the calculator choose the class width, and press ZOOM 9. Assume that your job is to choose potential applicants based on some criterion (such as, students who score over some value or perhaps the top 35% of students), and you want to use a histogram to build this choice. Then change the class

You will be costing the impacts of an agreement outlined as follows: Agreed to a 3-year contract effectiveApril1, 2021 to March 31, 2024. Key terms: 2% general wage increase onApril1, 2022 and April 1, 2023 $3600 signing bonus for each employee PRIOR TO the start of contract i.e. paid in full before April 1, 2021. Cost the settlement and provide

El nmero de ecuaciones lineales independientes es igual al rango de la matriz de coeficientes de las ecuaciones. Trminos clave Ecuaciones desacopladas 1 55) Ecuaciones independientes 1 53) Grados de libertad 1 59) Sobreespecificado 159) Solucin nica 1 53) Subespecificado 159) Variables de la corriente (p. 154) Prueba de autoevaluacin 1 . significa

Which of the graphs shown below gives the best eulerization of the given graph? (In the graphs below, added edges are denoted with zigzag lines.)

Analyze the scenario and complete the following: The number of customers who indicate they were satisfied on a customer satisfaction survey out of the two customers surveyed, if the overall customer satisfaction rate is 0.85. . Complete the discrete probability distribution for the given variable. Round to four decimal places if necessary x 0 1 2

In the conduct of statistical test, what are the two possibilities why the result is "not significant"? What measure indicates possibilities? Discuss.

The lifespan Golden Retriever dogs is normally distributed with mean 11.62 years and standard deviation of 1.22 years. (50 years ago the lifespan of Golden Retrievers was much higher at 16 to 17 years. There are scientific studies being conducted as to why the lifespan has been decreasing so rapidly over a relatively short amount of time.) What is

According to a study by the National Institute of Standards and Technology released in 2010, the most efficient engine company is composed of a crew of how many people? Question 10 options: A) 3 B) 4 C) 5 D) 6

Need to provide feedback or respond to this question, Uploaded is what i turned in. Thank you for getting this submitted. Normal null and alt are formatted in a specific manor, such as the following: Ho new = 0.0126 Ha new 0.0126 or Yours id currently off track. T-test stat looks like you got it. Critical value looks like you pulled the value for

Your colleague Alex has a meeting scheduled with you to discuss an important project. Alex sends an email an hour before the meeting, apologizing and mentioning they might need to push back the meeting due to an unexpected call with a client. Typically, Alex has had to reschedule meetings about 20% of the time. Whenever Alex is going to

Consider a normal distribution with mean 21 and standard deviation 8. What is the probability a value selected at random from this distribution is greater than 21? (Round your answer to two decimal places.)

Help with all steps please. Also help with answering question in complete sentence

A scientist studying babies born premature would like to obtain an estimate for the mean birth weight, u, of babies born the 24th week of gestation period. She plans to select a random sample of birth weights of such babies and use the mean of the sample to estimate u. Assuming that the population of birth weights of babies born during the 24th

Tell whether you have the following things associated with university life. Use forms of avoir in your answers MODELE des livres , j'ai des livres(Non , je n'ai pas de livres. ) un ordinateur portable 2. une tlvision 3. des camarades de chambre 4. un sac dos un vlo 6. une voiture

Analyze the annual data below for a hospital. What factor(s) impacted the CMI (Case Mix Index) in Year 2 and why? Number Medicare cases Average LOS Case Mix Index Year 1 8,525.00 6.07 1.2408 Year 2 9,138.00 6.11 1.2340 Question 15 options: Number of cases and average LOS: The volume of patients seen in Year 2 increased, and patients stayed longer

If a method produces a random error for each measurement of 4%, but a percent error of equal to or less than 1% is required for this value for later analysis, what is the minimum number of measurements that must be collected and averaged? You will need to solve equation 1 in section 25 for the value of n that meets the criterion of a 1% error in

A lock combination is made up of 3 numbers chosen from the number 0 to 30. How many combinations can be created that contain only even numbers?

Hello tutor, can I please get your help with the following stats? Consider a random sample of size n (i.e, a set of i.i.d. r.v. X_1, X_2,......, X n ) from a two-parameter distribution with parameter unknown and parameter known. The density function of , =1,..., is: (a|,) = 1/{(/}, < How would you find the joint density function f(x_1, ..., x_n)

a. Develop an estimated regression equation relating y to x1 . = ( )+() x2 Predict y if x1 = 45

What type of analysis is used if we have multiple qualitative independent variables, and one continuous dependent variable

Can I please get help with this page? Thank you

Los siguientes ejemplos vienen del espaol escritos por aprendices anglohablantes. Identifique el error y explique cul es la fuente del error. Usted recibir un punto por identificar el error y un punto por dar una explicacin acerca de la fuente del error. Error 1: Hay muchos turistos en las principales ciudades de Japn. Error 2: Cuando estaba una

A group of post-graduate students work together to complete a mini-research project. Their lecturer indicated that they should make use of explanatory research in the project. The students are disagreeing on the use of this type of research. A study that attempts to test predictions and hypotheses is more likely to be _____ . For this reason, if

College Basketball: Out of each team which one you predict to win Teas A&M vs Houston Yale vs San Diego State Grand Canyon vs Alabama Northwestern vs Connecticut Utah State vs Purdue Duquesne vs Illinois Oregon vs Greighton Colorado vs Marquette Washington State vs Iowa State Oakland vs NC State Texas vs Tennessee

In Module 1 you read about qualitative and quantitative variables and about the different levels of measurement (nominal, ordinal, interval, and ratio). In the past at RTC we use to assign letter grades A, B, C, D, and F. Now at RTC we use decimal values (4.0, 3.9, 3.8, ...1.2, 1.1, 1.0, 0.0) to assign grades. Please see course syllabus for

Consider the estimated equation from Example 4.3, which can be used to study the effects of skipping class on college GPA: colGPA 5 1.39 1 .412 hsGPA 1 .015 ACT 2 .083 skipped (.33) (.094) (.011) (.026) n 5 141, R2 5 .234. (i) Using the standard normal approximation, find the 95% confidence interval for bhsGPA. (ii) Can you reject the hypothesis

Studying the business of baseball, we look at the number of double-headers (consecutive games played on same day) by each team during the COVID seasons (2020, 2021). We find the following measurements: # of Double-headers 2 3 4 5 6 7 8 9 10 11 or more Frequency 5 2 3 4 4 2 3 3 1 3 Build the Probability model for these measurements. (Use 3 decimal

National test scores for school mathematics proficiency in Canada have a mean of 75 points. A sample of 42 school aged children were tested and they had an average score of 78, with a standard deviation of 10.23 points. Using a .05 significance level test the hypothesis that the mean test scores for Canadian School aged children is different than

Lunch break: In a recent survey of 697 working Americans ages 25 - 34, the average weekly amount spent on lunch as $44.09 with standard deviation $2.86 . The weekly amounts are approximately bell-shaped. (a) Estimate the percentage of amounts that were less than $41.23. Round the answer to one decimal place. Approximately % of the amounts were

(a) The 9 members of a fraternity have the following test scores: 118, 120, 121, 123, 126, 128, 129, 130, 182 . Which measure should be used to summarize the data? Mean Median Mode (b) At a certain company, the 9 employees have the following weekly salaries: $820, $850, $870, $880, $890, $910, $940, $960, $970 . Which measure should be used to

Using the table below, what is the sensitivity? (Please give your answer as a percentage, e.g., 8.6%.) Disease X No Disease X Positive 150 30 Negative 50 770

I have been working on this practice problem for a little while now, but I am having trouble. Can someone please walk me through how to solve it?

A survey was conducted to determine the amount of credit card debt incurred by students attending college in the United States. In a sample of 25 college students, the sample mean credit card debt is $4,500 with a standard deviation of $1,200. Construct a 95% confidence interval for the true population mean of credit card debt of college students

A norm-based derived score based on totals of subdomain scaled scores, used to compare one child's performance on the BDI-2 to the performance of same-aged peers, average is 100. A. Confidence interval B. Norm-referenced score C. Standard Score

Can you provide step by step for finding p-value when r= .61?

n 2016 a poll estimated that 3.2% of adults in a certain country are vegetarian. A nutritionist thinks this rate has changed. The nutritionist samples 300 adults from this country and finds that 16 are vegetarian. Complete parts (a) through (c) below. Question content area bottom Part 1 a. What is ModifyingAbove p with caret, the sample proportion

Please, answer questions #1 & #2. Thank you!! According to the National Postsecondary Student Aid Study conducted by the U.S. Department of Education in 2008, 62% of graduates from public universities had student loans. We randomly select 50 students at a time. Question#1 What is the mean of the distribution of sampling proportions? Do not round,

This is a student survey conducted by college students, not professionals. 50 participants took a survey based on Alzheimer's disease and use this data to find the mean, standard deviation, and t-test of males and females, the CorrAge. Remember, it was 50 participants who took the survey. Percentage of Races- African American 38%, Caucasian 16%,

9) A psychologist is interested in the conditions that affect the number of dreams per month that people report in which they are alone. In the general population the number of such dreams per month follows a normal curve, with = 5 and = 4. The psychologist studies 36 individuals and found that their mean number of alone dreams is 8. What is the Z

all questions. Please round if needed, follow the questions prompts.

The Bonferroni method is a conservative approach for handling the estimation of the chance of error in multiple tests compared to other tests such as Tukey's HSD and Scheffe. Explain why

a participant does not know the answer to a survey question but there isn't a dont know response option offered so they choose an answer randomly; a _ will occur

You wish to describe the type of patients who use the anticoagulation monitoring services your department/hospital provides. Specifically, the Pharmacy and Therapeutics Committee (P&T) is interested in the age of the population served. Which one of the following pieces of information [about the type of patient, related to their age] will be most

Have you ever collected original data and performed an analysis, perhaps as an assignment for another class? Briefly describe the data you collected and your analysis. Keep in mind, an analysis doesn't have to be complex, it could be as simple as reporting summary statistics (e.g., sample average and standard deviation). Please respond to at least

Inquiry-based question for 4.2E: Perform repeated investigations to increase the reliability of results

For the following problem, solve it in detail (show all of your steps). Answer the following questions: a) For a catered event, how many unique ways can 4 appetizers be selected from 12 available? b) For a first prize of $1000, 2 nd prize of $100, 3 rd prize of $50, and a 4 th prize of $10, how many different ways can 4 people be selected from 12

In a student survey, fifty-two part-time students were asked how many courses they were taking this term. The (incomplete) results are shown below: Please round your answer to 4 decimal places for the Relative Frequency if possible. # of Courses Frequency Relative Frequency Cumulative Frequency 1 18 2 0.3654 37 3 15 0.2885 52 What percent of

To investigate water quality, in early September 2016, the Ohio Department of Health took water samples at 2424 beaches on Lake Erie in Erie County. Those samples were tested for fecal coliform, which are the E. coli bacteria found in human and animal feces. An unsafe level of fecal coliform means there is a higher chance that diseasecausing

Suppose the following table contains data representing the number of employees laid off at a particular company

The SFCC model differs from SFBT in what key procedural way? a. There are no differences b. The miracle question is asked before the goals are set c. The miracle question is asked after the goals are set d. The SFCC does not have a follow up stage

What kind of data was used to help predict the outcome of the Women's NCAA Tournament 2024

The Royal Bank of Canada (RBC) issues VISA credit cards. It is estimated that the balances on all VISA credit cards issued by RBC have a mean of $845 and a standard deviation of $270. Assume that the balances on all these VISA cards follow a normal distribution. a) What is the probability that a randomly selected VISA card issued by this bank has

A zookeeper records the number of male and female giraffes born in a particular year. 35% of the giraffes are male, and 65% are female. 40% of the time, male giraffes are born with brown eyes, and 25% of the time, females are born with brown eyes. The zookeeper created this diagram to represent the number of male and female giraffes. How many blue

Suppose you are conducting a survey to assess the satisfaction levels of students in a university. The student population can be categorized into three major departments: Arts, Science, and Engineering. To ensure representation from each department, you decide to select a random sample of students from each department. Which sampling method are

Individuals with a bachelor's degree are expected to earn: less than those with high school diplomas. less than those with some college experience. more than those with some college experience but no degree. about the same as those with some college experience but no degree

complete Developed innovative curriculum to instruct individual students, small groups, and classes of 20 plus students in grades 7-12

paraphrase think the group data represents the data the best because we are looking if one solution or all can cause a difference to the data and it supports the alternative hypothesis that ATP and Salts would make a difference to the length. The class data has a change in solutions A,B,C when we are looking for no change so it rejected the null

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