I need typing clear urjent no chatgpt use i will give 5 upvotes In a statistics class, the standard deviation of the heights of all students was 3.9 inches. The standard deviation of theheights of males was 3.5 inches and the standard deviation of females was 3.4 inches. Why is the standard deviation of theentire class more than the standard deviation of the males and females considered separately?Choose the correct answer below.OA. The smaller sample size results in a smaller sample standard deviation.OB. The distribution of the heights for the entire class generally has more spread than the distribution of the heights ofthe individual sexes.OC. There is more dispersion in the heights of the male and female samples than the heights of the entire class.OD. The sample sizes of the male students and female students are less than the sample size of the entire class.

The correct answer is:B. The distribution of the heights for the entire class generally has more…

Answered: In a statistics class, the standard…

Understanding Business

12th Edition

ISBN:9781259929434

Author:William Nickels

Publisher:William Nickels

Chapter1: Taking Risks And Making Profits Within The Dynamic Business Environment

Section: Chapter Questions

Problem 1CE

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You want to provide an overview of the characteristics of the respondents in your sample. Which of the following would you use to provide insight in the age of your respondents? a. A frequency table and a bar chart b. The mode, median and the standard deviation c. The mean and the variance. d. The mean, the median, and the mode
According to Reader's Digest, 47% of primary care doctors think their patients receive unnecessary medical care. Use z-table. a. Suppose a sample of 310 primary care doctors was taken. Show the sampling distribution of the proportion of the doctors who think their patients receive unnecessary medical care. E(F) (to 4 decimals) b. What is the probability that the sample proportion will be within ±0.03 of the population proportion. Round your answer to four decimals. c. What is the probability that the sample proportion will be within 0.05 of the population proportion. Round your answer to four decimals. d. What would be the effect of taking a larger sample on the probabilities in parts (b) and (c)? Why? The probabilities would - Select your answer - This is because the increase in the sample size makes the standard error, Op . - Select your answer - ♥
Which of the following would be an advantage of using variables sampling ratherthan probability-proportional-to-size (PPS) sampling?(1) An estimate of the standard deviation of the population’s recorded amount isnot required.(2) The auditor rarely needs the assistance of a computer program to design anefficient sample.(3) The inclusion of zero and negative balances usually does not require specialdesign considerations.(4) Any amount that is individually significant is automatically identified andselected.
You may need to use the appropriate appendix table or technology to answer this question. The following results come from two independent random samples taken of two populations. Sample 1 Sample 2 n1 = 60 n2 = 25 x1 = 13.6 x2 = 11.6 σ1 = 2.5 σ2 = 3 (a) What is the point estimate of the difference between the two population means? (Use x1 − x2.) (b) Provide a 90% confidence interval for the difference between the two population means. (Use x1 − x2. Round your answers to two decimal places.) to (c) Provide a 95% confidence interval for the difference between the two population means. (Use x1 − x2. Round your answers to two decimal places.) to
What is the meaning of x ~ N (50, 20)? 1. Sampling distribution of x is distributed with a mean of 20 and a standard deviation of 50 2. x-bar is normally distributed with a mean of 20 and a standard deviation of 50 3. x is normally distributed with a mean of 50 and a standard deviation of 20 4. Sampling distribution of x is distributed with a mean of 50 and a standard deviation of 20
Given a data set with μ=18 and σ=3, find the percent of data within each range: between 15 and 21 = [""] % between 12 and 24 = [""] % below 18 = [""] % between 12 and 21 = [""] %
The weights of a random sample of cereal boxes that are supposed to weigh 1 pound are given below. Estimate the standard deviation of the entire population with 92.8% confidence. 0.95 1.01 0.97 0.95 1.04 0.98 1.02 1.03 LCL = UCL =
8. assignment variable at which the treatment status does NOT change In Regression Discontinuity framework, the cutoff is defined as the level of the True False 9. What regression equation do we use for regression discontinuity framework? a) Y = Bo + B1 T + B2Xu+ Ei b) Y = Bo + B,T+ B2C + ei c) Y, = Bo + B, T+ B2 (Xi-C) + ei d) Y, = Bo + B1T + B2 (Xu + C) + € 10. Regression Discontinuity Design accomplices apples-to-apples comparison by comparing individuals as far from the cutoff as possible. True False
Which of the following involves a test of two-related samples? Multiple Choice Test of whether the mean salary of professors at Metro University is higher than the national average for university professors Test of differences in the percent of men and women who are or are not members of Greek organizations on campus Test of whether a change occurred in the proneness for heart disease among people who switched to a diet high in fish Test of the average incomes of subscribers of Southern Living and Better Homes and Gardens Test of differences in ad recall among three experimental groups (each of which saw a different advertisement) and a control group
What is the meaning of x ̅ ~ N (50, 2)? 1. The Sampling distribution is distributed normally with a mean of 50 and a standard deviation of 2 2. Sampling distribution of x is distributed normally with a mean of 2 and a standard deviation of 50 3. x is normally distributed with a mean of 50 and a standard deviation of 2 4. x-bar is normally distributed with a mean of 2 and a standard deviation of 50
A simple random sample is a sample drawn in such a way that each member of the population has: some chance of being selected in the sample. an equal chance of being included in the sample. a 1% chance of being included in the sample.
A sample of twenty automobiles was taken, and the miles per gallon (MPG), horsepower, and total weight were recorded. Develop a linear regression model to predict MPG using horsepower as the only indepen- dent variable. Develop another model with weight as the independent variable. Which of these two models is better? Explain. MPG 44 44 40 37 37 34 35 32 30 28 26 26 25 22 20 21 18 18 16 16 4 HORSEPOWER 67 50 62 69 66 63 90 99 63 91 94 88 124 97 114 102 114 142 153 139 WEIGHT 1,844 1,998 1,752 1,980 1,797 2,199 2,404 2,611 3,236 2,606 2,580 2,507 2,922 2,434 3,248 2,812 3,382 3,197 4,380 4,036

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