Nine students took a standardized test. Their scores are listed below. Later on, they took a test preparation course and retook thetest. Their new scores are listed below. Use the Wilcoxon signed-ranks test to find the test statistic T to test the hypothesis that thetest preparation had no effect on their scores. Use a = 0.05.Student1 234567990Before Score 970 1,100 890940 1,030 1,160After Score 1,170 1,100 790 1,390 1,240 1,130 1,060OA. 2OB. 32OC. 41OD. 48 91,070 8301,470 1,030

The wilcoxon signed ranks test, checks the median difference between two paired groups. If the…

Answered: Nine students took a standardized test.…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Which of the following can increase error in a statistical experiment? (Select all that apply) a. Convenience Sample b. Small sample size c. The sample that has the same characteristics as the population. d. None of these condition will increase error in statistical experiments.
The 25th and 75th percentile points (without interpolation) are?
You perform a two-sample hypothesis test to compare the proportions of two populations. You find that your p-value is greater than alpha. This means: Group of answer choices a.You have evidence that the population proportions are the same. b.You have evidence that the population proportions are different. c.You do not have evidence that the population proportions are different. d.You do not have evidence that the sample proportions are different.
When we test the hypothesis that the population proportions are equal, we can use the Z test for a one-sided as well as a two-sided alternative. Select one: a. False b. True C. Not sure
Members of fraternities and sororities are required to volunteer for community service. Do fraternity brothers work fewer volunteer hours on average than sorority sisters? The data below show the number of volunteer hours worked for thirteen randomly selected fraternity brothers and eleven randomly selected sorority sisters. Brothers: 14 7 11 13 9. 11 8 12 7 13 10 13 Sisters: 13 19 16 11 11 19 5 10 16 17 7 | d. The p-value is ? O a e. Based on this, we should Select an answer the null hypothesis. f. Thus, the final conclusion is that ... The results are statistically significant at a = 0.05, so there is sufficient evidence to conclude that the population mean volunteer hours for fraternity brothers is less than the population mean volunteer work hours for sorority sisters. The results are statistically insignificant at a = 0.05, so there is insufficient evidence to conclude that the population mean volunteer hours for fraternity brothers is less than the population mean volunteer work…
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A public opinion poll surveyed a simple random sample of voters. Respondents were classified by gender (female or male) and by voting preference (Republican, Democrat, or Independent). The results are presented here: Republican 261 202 Female Male You want to determine if gender and voting preference are independent. Use a level of significance of a = 0.05. What is the test statistic for this test? (Round your answer to three decimal places.) Democrat 239 181 Independent 42 62
Scenario: 200 people were asked, “Who is your favorite superhero?” Below are the data. Test the null hypothesis that the population frequencies for each category are equal. α= .05. Iron Man Black Panther Wonder Woman Spiderman fo = 40 fo = 60 fo =55 fo = 45 fe = fe = fe = fe = What is the correct result based on the data?
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Participants who agree to use a certain weight loss pill to help alleviate their hunger were randomly surveyed before and after taking the weight loss pill. Their responses are given below using a scale from 1 to 10, where 1 is a small amount of hunger and 10 is very hungry. Does this weight loss pill help alleviate hunger? Before 9 9 7 6 8 7 7 5 8 After 8 9 6 5 8 7 8 4 6 What is the decision for this test? Participants who agree to use a certain weight loss pill to help alleviate their hunger were randomly surveyed before and after taking the weight loss pill. Their responses are given below using a scale from 1 to 10, where 1 is a small amount of hunger and 10 is very hungry. Does this weight loss pill help alleviate hunger? Before 9 9 7 6 8 7 7 5 8 After 8 9 6 5 8 7 8 4 6 What is the decision for this test? Fail to reject the null because the test statistic is not in the critical region and the p-value is less than alpha. Reject the null because the…
Find the standardized test statistic estimate, z, to test the hypothesis that p1 > p2. Use α = 0.01. The sample statistics listed below are from independent samples. Sample statistics: n1 = 100, x1 = 38, and n2 = 140, x2 = 50 a.0.638 b.0.362 c.2.116 d.1.324
A psychologist would like to examine the effects of a new drug on the activity level of animals. Three samples of rats are selected with n=5 in each sample. One group gets no drug, one group gets s small dose, and the third group gets a large dose. The psychologist records the activity level for each animal. The data from this experiment are presented below. No drug Small dose Large dose 5, 3 , 1 , 1 , 5 5, 5, 9, 6, 5 10, 12, 9, 6, 8 =3, SS=16 =6, SS=12 =9, SS=20 Do these data indicate any significant differences among the three groups? Test with α=0.05. Compute the effect size and interpret the result.

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