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Mathematics Questions and Answers September 16, 2018

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how would you use MATLAB to recalculate the 95% confidence interval

It is believed that a patient's FEV (forced expiratory volume) can be predicted by their height. A doctor collected the following data to explore relations between height (x) in inches and FEV (y) in liters. xi 60.6 62.2 63.8 65.4 67.1 68.5 70.1 yi 2.5 2.9 3.0 3.3 3.4 3.9 4.2 1. Assuming E[y] = 0 + 1x, compute the least squares estimates 0 and 1

An initial study conducted of a global software services company indicates that higher work-life balance leads to higher employee retention. Which of the following statements is true about the nature of the variables in the study? Select one. Question 6 options: Work-life balance is the dependent variable. None of the above. Employee retention is

This exercise can be solved using combinations even though the problem statement will not always include a form of the word "combination" or "subset." An electronics store receives a shipment of 40 graphing calculators, including 8 that are defective. Four of the calculators are selected to be sent to a local high school. How many of these

The following histograms display the same average grant aid data separated for private and public universities. 5000 10000 15000 20000 25000 30000 35000 40000 45000 50000 55000 -5000 50 100 150 200 250 -50 -100 Average Grant Aid for Top Universities: Public 5000 10000 15000 20000 25000 30000 35000 40000 45000 50000 55000 -5000 50 100 150 200 250

Part 2: Create a brief description at the beginning of your survey. Pretend that you are sending this survey out to potential participants. In the brief description, include: The purpose of the survey in your own words (do not just copy and paste the research question or objective) A statement that says the principal investigator of this study is

Given the following box plot: This is a horizontal boxplot graphed over a number line from 0 to 13. The first whisker extends from the smallest value, 0, to the first quartile, 2. The box begins at the first quartile and extends to third quartile, 12. A vertical, dashed line is drawn at median, 10. The second whisker extends from the third

A coin-operated coffee machine made by BIG Corporation was designed to discharge a mean of 7.1 ounces of coffee per cup. BIG has good reason to believe that the mean amount of coffee dispensed by the machine, , is greater than 7.1 ounces, and plans to do a statistical test of the claim that the machine is working as designed. Technicians gather a

Dengan menggunakan data penjualan bulanan selama tahun 2024 diperoleh persamaan trend linear sebagai berikut: Yt =9,83 +2,72X, dengan penjualan bulan Februari 2024 sebagai bulan dasar (Xt= 0), maka ramalan penjualan bulan Januari 2025 adalah sebesar

Write one or more excel fucntion(s) in cell stats!b11 that calculates the 3 highest number of hours exercised. Make sure this function can be copied down to stats!b12 and stats!b13 with no changes.

An aviation student researcher examined the relationship between pilots' simple visual reaction times and experience, which she defined as number of flight hours including simulator time. Visual reaction time was measured by having participants press a joystick immediately at the appearance of a suprathreshold spot target and was measured in

An investor believes that investing in domestic and international stocks will give a difference in the mean rate of return. They take two random samples of 15 months over the past 30 years and find the following rates of return from a selection of domestic (Group 1) and international (Group 2) investments. Can they conclude that there is a

In a true experiment, people are randomly assigned to the Group of answer choices Independent variable Dependent variable Correlation coefficient Demand characteristic

Your school district decides to implement exit exams for students in 12th grade to ensure that all students demonstrate mastery of basic concepts in reading, math, and writing. Students must obtain a passing score of 70% correct on these exams in order to graduate. Interpretation of scores from these exit exams is an example of

coin toss Toss a quarter 50 times. Let the coin fall freely. data set and the type of tests that apply as useful for analysis

Which process involves choosing part of a population of interest for inspection?

4 Mark this question Find the total area bounded by the graphs of f left parenthesis x right parenthesis equals 3 x cubed minus x squared minus 10 x and g left parenthesis x right parenthesis equals short dash x squared plus 2 x. 12 space u n i t s squared 32 space u n i t s squared 24 space u n i t s squared 8 space u n i t s squared

There is a strong possibility that a convenience sample will be biased. Group of answer choices True False

If grades go up as the number of study hours go up, this is called what type of relationship? a. positive b. a fluke c. inverse d. negative

The probability distribution for scores on a ten-question quiz are given below. Find the mean and the standard deviation of the probability distribution using a TI-83, TI-83 Plus, or TI-84 graphing calculator. Round the standard deviation to three decimal places. Score (x): P(x) 0 0 10 0.02 20 0.04 30 0.05 40 0.05 50 0.05 60 0.4 70 0.3 80 0.04 90

A researcher weighs each individual in a sample of 25 laboratory rats and calculates the average weight for the sample. The average weight of 312 grams is an example of a ___________. Group of answer choices parameter statistic variable nominal scale of measurement

About 6% of employed adults in the United States held multiple jobs. A random sample of 63 employed adults is chosen. Use Excel as needed. Is it appropriate to use the normal approximation to find the probability that less than 6.3% of the individuals in the sample hold multiple jobs? If so, find the probability. If not, explain why not. It

content area top Part 1 Determine the point estimate of the population proportion, the margin of error for the following confidence interval, and the number of individuals in the sample with the specified characteristic, x, for the sample size provided. Lower boundequals0.127, upper boundequals0.403, nequals1000

content area top Part 1 The table shows population statistics for the ages of Best Actor and Best Supporting Actor winners at an awards ceremony. The distributions of the ages are approximately bell-shaped. Compare the z-scores for the actors in the following situation. Best Actor Best Supporting Actor muequals44.0 muequals50.0 sigmaequals8.9

What grade would someone earn if they had: 6 mastered prelabs 5 mastered plans 0 Not-yet-mastered safety scores 6 mastered summaries 6 mastered postlabs 3 mastered scientific communications 3 mastered peer evaluations 2 mastered quizzes, and had completed all beginning-of-term activities and satisfactory attendance? Choice 1 of 4:A Choice 2 of

What is one way to directly compare two or more sets of d_____ is derived from raw data and has a known basis for comparison. Group of answer choices A percentile A standard score A standard deviationata? Group of answer choices Percentiles Ratios Z-scores

1. A financial advisor is putting together a report on different Exchanges on which stock is traded (NYSE, AMEX, or other). What type of variable and level of measurement is the advisor using in his report? a. Categorical variable (qualitative), ordinal level of measurement b. Categorical variable (qualitative), nominal level of measurement c.

The bedrock of the lean six sigma philosophy is Group of answer choices Statistics FMEA It's focus on the voice of the customer Process mapping

conduct a candle observation lab. Observe the unlit candle for a couple minutes. list 3 quantitative and 3 qualitative observations

Under a normal distribution, which of the following is more likely? (Note: this question can be answered without any calculations if you draw out the distributions and shade properly.) Getting a z score greater than z = 2.75 Getting a z score less than z = 1.50

In the frequency table, L50 represents: Question 69Answer a. The upper limit of the class below the median class b. The upper limit of the median class c. The lower limit of the class above the median class d. The lower limit of the median class

Praxis for 5453 test for educators sample test and tips . Rephase and add words. Special ed

Which factor would indicate that a qualitative research method would be most appropriate? O The researcher has established an a priori hypothesis. O The researcher wants to examine the relationship between variables. The researcher has developed their own theory and wants to see if it works in the field. O The researcher does not have any

The set of potential outcomes that are mathematically exhaustive and mutually exclusive is a definition of Possibility Vulnerability Probability Risk

chat caculate the average: 8.2% 8.2% 8.4% 8.8% 8.7% 9.1% 8.6%

A power analysis of .70 revealed the need for a sample of at least 190 participants

Overall, scholarship centered on measuring the nature and extent of campus sex assault has revealed ____________. Group of answer choices that college students are significantly more likely to report sexual victimization as compared to the general population. that college students have similar rates of reporting as compared to the national

If the wheel is spun once, what is the probability of getting the number zero? A.) 3 over 4 B.) 1 fourth C.) 1 over 12 D.) 1 half

In the game of craps, a pair of dice are rolled, and people bet on the outcome. For example, you can bet $1 that the sum of the dice will be 11 (also called "Yo-leven"). The probability that you win is 1/18, and if you win, your profit is $15. If you lose, you lose $1. (a) What is the expected value of your profit? Round the answer to two decimal

The medal count for the 2018 winter Olympics is recorded below. Run an independence test to find out if the medal won is dependent on country. Use =0.10. Gold Silver Bronze Norway 17 14 11 Germany 16 9 6 Canada 13 9 11 United States 12 10 7 Enter the test statistic - round to 4 decimal place

what is the volume expression to the problem: The problem involves finding the volume of a region enclosed by the curve y = 1 + x y=1+x, x = 0 x=0, and x = 9 x=9 when rotated about the line x = 9 x=9. This requires using two disk methods

Based on a survey, assume that 28% of consumers are comfortable having drones deliver their purchases. Suppose that we want to find the probability that when four consumers are randomly selected, exactly two of them are comfortable with delivery by drones. Identify the values of n, x, p, and q.

N = 258 domestic flights in the U.S. We assume the overall FEI mean relative to all commercial airlines in the U.S. is = 84, = 8, and the population of scores is normally distributed. As a performance analyst at a prominent U.S.-based commercial airline, your current focus revolves around investigating and optimizing fuel consumption practices

Find a linear model of the relationship between the X and Y variables and report the regression line. In 300-500 words, address the following: Identify the predictor variable and the criterion variable. Describe the relationship between Substance Use and Suicides in terms of strength (weak/strong) and direction (positive/negative). Discuss whether

The number of pairs of dress shoes owned by men is a discrete random variable with the following probability distribution. x 0 1 2 3 4 5 p ( x ) 0.61 0.16 0.11 0.07 0.03 0.02 (a)What is the variance of this discrete random variable?(b)What is the standard deviation of this discrete random variable? (Round your answer to two decimal places.) Need

Describe ampliamente con argumentos detallados Qu prueba estadstica consideras es la mas recomendada, la que mas se usa en tiempos modernos, facil de comprender, usar, explicar y el por que , para la investigacin y evaluacin en consejera? cita referencias bibliograficas reciente

A randomized trial comparing the efficacy of two drugs showed a difference between the two (with a p value

It implies difference in a positive direction. Question 9Select one: a. Non-directional hypothesis b. Negative directional hypothesis c. All of the Above d. Positive directional hypothesis

true or false - Random or statistical variables are those which cannot be measured in interval scales

9.2 What is wrong with this definition of the problem, "Sales are off, our numbers are down, and we need more customers

A political polling agency predicts candidate A will win an election with 54% of the votes. Their poll has a margin of error of 4% both above and below the predicted percentage. Which inequality represents the predicted possible percent of votes, x, for candidate A? 50 x 58 x 50 or x 58 x 52 or x 56 52 x 56

he correlation coefficient is -0.98 (note: absolute values less than 0.95 MAY mean the model is not appropriate for making predictions). What does the correlation coefficient mean in terms of price and demand of the iPod touch? answer in 3 sentences

SUMMARY OUTPUT Regression Statistics Multiple R 0.570918 R Square 0.325947 Adjusted R Square 0.303479 Standard Error 15.68819 Observations 32 ANOVA df SS MS F Significance F Regression 1 3570.423 3570.423 14.50688 0.000644 Residual 30 7383.577 246.1192 Total 31 10954 Coefficients Standard Error t Stat P-value Lower 95% Upper 95% Lower 95.0% Upper

In quantitative research, descriptive statistics is used when the researcher needs to summarize data. Which of the following is not included in descriptive statistics? Group of answer choices Mean Frequency distribution Correlations Standard deviation

Which of the following variables is a measurement variable? Group of answer choices Length Sex Color Gender

What pattern can be seen in the U.S. concentration of wealth since 1945? Group of answer choices Continuous increase to level not seen since 1929 Stable distribution with minor periodic changes Decline followed by a rebound to levels seen in the 1920s Steady decrease with no significant fluctuations

2. A call center receives 100 calls per hour. On average, a call lasts for 6 minutes. How many calls are being handled simultaneously on average? (3)

pbs find out the percentage increase from 2024 10,013 billion to fy 2025 10,729 billion

In what ways do the recent replacements differ from NAD 83 and NAVD 88? Check all that apply. Group of answer choices The National Geodetic Survey will discontinue the Continuously Operating Reference Stations (CORS). The new terrestrial reference frame will correct a discrepancy of about 2.2 meters between the origin of NAD 83 and the earth's

will be scored. Each of the following statements is a description of either an observational study or an experimental study. Select the state describes an observational study. A researcher measures bacterial growth in water. They then add acid to water to decrease the pH and measure bacterial growth ag D A researcher asks people to eat a lemon and

If Y is three times greater than X, and Y is 10 more than Z. If X = 35 what is Z

Antecedents set the occasion for a behavior to occur and consequences alter the probability that the behavior will occur again. Question 5 options: a) True b) False

What distinguishes pivotal from pilot studies? Group of answer choices A. Pilot studies must occur after pivotal ones B. Pivotal studies follow GCP and support regulatory approval C. Pivotal studies are less expensive D. Pilot studies are longer E. Pivotal studies are exempt from audits

Give one example of a data collection method (surveys, how can surveys be a disadvantage to researchers

Marsha has worked 8 hours today and had a total of 48 sales. What is her average sales per hour? Group of answer choices 2 4 6 8

The type of statistics that makes conclusions about a population by drawing conclusions from a sample is called ________. a. Descriptive statistics b. Inferential statistics c. Generalized statistics d. Mathematical statistics

does the following assignment mean i only need to complete and submit the module assignment template? For this assignment, you will analyze three types of quantitative research design presented in the course and graphically illustrate the designs using an APA-formatted table or three figures. Step 1 Review the quantitative research designs

The trend analysis report of Basic, Inc. is given below (in millions): 2026 2025 2024 2023 2022 Net income $ 690 $ 602 $459 $406 $ 400 Using 2022 as the base year, the net income in 2026 is ________. Question content area bottom Part 1 A. 42.0% higher B. 73.0% higher C. 27.0% higher D. 58.0% higher

Exercise 1. Probability of cyan - generalized In the edX exercises for this section, we calculated some probabilities by hand. Now we'll calculate those probabilities using R. One ball will be drawn at random from a box containing: 3 cyan balls, 5 magenta balls, and 7 yellow balls. What is the probability that the ball will be cyan

YLLs are the product of the number of deaths from a particular cause (in a particular age group) multiplied by the _____________ for that age group Group of answer choices population age distribution mortality prevalence reference life expectancy annual number of live births

Use the scenario to answer the following questions | Jen, the HR Manager at an R&D firm, is concerned about high employee turnover rates. She has collected data on various factors such as turnover intent, salary, performance ratings, and employee engagement scores. She wants to use this data to understand and predict turnover. What would a

Mention five (5) criteria for formulating a hypothesis. Define the concept of Hypothesis. What is the purpose of the null hypothesis? What is the quantitative and qualitative approach of the Correlational Study? What conditions must the Causal Relationship Hypothesis meet? (References)

Use the scenario to answer the following questions | Jen, the HR Manager at an R&D firm, is concerned about high employee turnover rates. She has collected data on various factors such as turnover intent, salary, performance ratings, and employee engagement scores. She wants to use this data to understand and predict turnover. When visualizing the

The median is the same as the (Choose one) quartile

The sampling technique used by a researcher is generally determined by the modern empirical advances O interest of the studied population research goals and purpose sufficiency principle

What do you think the odds of winning the lottery are? Winning in Vegas

reply to Discussion 1 Sampling Methods in Business Simple random and stratified sampling are helpful in business, but they work differently. Random sampling gives everyone the same chance of being picked, which makes it fair, but it does not always guarantee that all groups are represented. Stratified sampling splits people into groups, such as by

It is popularly known as the "fishbowl technique". Question 12Select one: a. Snowballing b. Lottery method c. Table of random numbers d. Network sampling

why is the mode an appropriate measure of variation for the categorical variable

(10 points) (AM) Is there a difference in how much males and females use aggressive behavior to improve an angry mood? For the "Anger-Out" scores: a. Create parallel box plots

In JMP a diamond is displayed in the box, where the center of the diamond is _________. Group of answer choices The skewness value The halfway between outliers The median The mean

A school tracks the amount of screen time students report each day and their GPA. Which variable would you consider explanatory, and which would you consider the response variable, and why? Note: Even if your answer is not what I might expect, you may still receive full credit if your explanation demonstrates that you know correctly understand how

The following table shows deaths due to tuberculosis (TB) in City A and City B in a certain year. Complete parts (a) through (c) below. City A City B Race Population TB Deaths Population TB Deaths White 4 comma 696 comma 000 8200 84 comma 000 130 Nonwhite 90 comma 000 400 47 comma 000 170 Total 4 comma 786 comma 000 8600 131 comma 000 300 Question

Refer to the table below. Of the 36 possible outcomes, determine the number for which the sum (for both dice) is 6. Die 1 1 2 3 4 5 6 Die 2 1 (1,1) (1,2) (1,3) (1,4) (1,5) (1,6) 2 (2,1) (2,2) (2,3) (2,4) (2,5) (2,6) 3 (3,1) (3,2) (3,3) (3,4) (3,5) (3,6) 4 (4,1) (4,2) (4,3) (4,4) (4,5) (4,6) 5 (5,1) (5,2) (5,3) (5,4) (5,5) (5,6) 6 (6,1) (6,2) (6,3)

The quantum-mechanical orbitals represent________A________. Each orbital has a region of highest ___B____. roughly corresponding to its ____C____ . The farther from this region, the ____D___ the probability of finding the electron, but the probability never quite reaches ___E___ . This produces a fuzzy effect. Group of answer choices A B C D E

Determine whether the statement is true or false. A vertical line intersects the graph of a function at most once.Determine whether the statement is true or false. If x1 < x2 and f is a decreasing function, then f(x1) > f(x2). True

3 Provide the coefficient of determination for the relationship between MAT and the percentage of trees with lobed leaves (to two decimal places). (1 Mark) %Lobed; 0.545 4 . Provide the coefficient of determination for the relationship between MAT and the percentage of trees without toothed leaves (to two decimal places). (1 Mark) Trees without

9. I need to hire some more people to work in my growing curry empire. Naturally, with the great benefits and high salaries, lots of time off and endless supplies of curry - not to mention the prospects of international travel when we open our distribution centers in Brazil, I believe that 90% of people I make an offer to will accept the job - I

The Women's Health Study included 39,876 female health professionals aged 45 years and older who were followed for an average of 10 years (Ridker et al., 2005). At the beginning of the study, participants were randomly assigned to take either a daily low-dose aspirin or a daily placebo pill for the duration of the study. At the end of the study,

Which of the following best describes the results for the redfin data? Question 3Select one: a. Both clustering methods (k-means and hierarchical) provide similar clusters. b. All k-means clusters are very different from the hierarchical clusters. c. Four of the 5 clusters are similar but one cluster is different between the two cluster methods.

sing data from 15 automobile accidents, the correlation coefficient between the combined speeds of the cars (x) in an accident and the amount of damage done (y) is 0.7831. The regression equation for the two variables is y = 801.518 + 162.845x Is this a significant correlation? Yes No Question at position 14 14 Numeric 2 points Question at

What is the union probability formula and how is it written

Can you compute the descriptive statistics for all the numerical variables in the data without repeating your code for each variable? HINT: You can use functions like lapply() or sapply() in R to do this. Optional Bonus Question (+2 points) Can you create a function that takes two inputs: input_data (a dataframe) and id (a column name). Here are

1-Consider a binomial random variable with n = 9 and p = 0.7. Let x be the number of successes in the sample. Evaluate the probability. (Round your answer to three decimal places.) P ( x 3 2- Consider a binomial random variable with n = 6 and p = 0.7. Let x be the number of successes in the sample. Evaluate the probability. (Round your answer to

A recent study assessed the long-term quality of life of oral/oropharyngeal cancer survivors who received a new type of treatment. A total of 135 survivors completed a quality of life questionnaire called the EORTC QLQ-C30. Their mean social functioning score was 75.0 with a standard deviation of 23.2. For this scale, a score of 82.6 is what we

Piping used in sprinkler systems is normally designed to withstand a working pressure of not less than Select one: A. 175 psi. B. 212 psi. C. 340 psi. D. 500 psi

puedes abundar sobre esto y citar textualmente algunos autores El Instrumento de recoleccin de datos que recomendara seria las encuestas estructuradas en formato fsico o digital con fcil accesibilidad que permita llegar a una gran audiencia en el rea metropolitana, las respuestas estructuras que se obtienen de estas encuestas permite el anlisis

(d) Based on the confidence interval constructed in part (a), is it likely that the mean number of personal computers is greater than 3.22? It ? likely that the mean number of personal computers is greater than 3.22

Why is corpus-based analysis useful for quantitative analysis? Question 5Select one: a. To identify linguistic patterns that are generally true for a register. b. To ensure accuracy in research c. To communicate with a specific person d. None of the choices

A researcher would like to compare two treatment conditions with a set of 30 scores in each treatment. If a repeated-measures design is used, the study will require n = 60 participants. Group of answer choices True False

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