A publishing company has developed a study guide (reference book) for GRE Math test. They want to test if this reference book does help students perform better on the test.The company recruited a random sample of students who are planning to take this test and let them use the new reference book. Their scores are listed below. Test the nullhypothesis that the students' mean score is not different from the national average (at a significance level of .05) by answering the following questions. The national statisticsindicates that the average score for the population is 68.5.Scores: 70, 68, 93, 78, 73, 99, 81, 79, 61(1) Set up hypotheses ((2) What is the df and the critical value for this test? ((3) What is the standard error for this test?(4) What is the t_observed for this test? ((5) Provide the decision and the interpretation

The data is as follows scores(x) 70 68 93 78 73 99 81 79 61 α=0.05

Answered: A publishing company has developed a…

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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According to the Centers for Disease Control and Prevention (CDC), the mean BMI of U.S. men of age 40–49 years old is 28.4 Using the provided sample data file, conduct a one-sample ?-z-test of a mean to test whether the mean BMI of men of age 40–49 years old who smoke daily is lower than 28.4. Conduct the ?-z-test at a significance level of ?=0.05 to test the null hypothesis, ?0:?=28.4, against the alternative hypothesis, ?1:?<28.4, where ?μ represents the mean BMI of U.S. men of age 40–49 who smoke daily. Assume that the population standard deviation of BMI, ?σ, is 8.346 The sample data provided contain BMI results collected from a 2015 survey conducted by the National Center for Health Statistics for men of age 40–49 who smoke daily. Calculate the sample mean, ?⎯⎯⎯x¯, for this data. Give your answer precise to at least one decimal place. Calculate the sample mean, ?⎯⎯⎯x¯, for this data. Give your answer precise to at least one decimal place. Compute the standard deviation, SD, of…

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