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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Given that the researcher wants to be sure the mean difference in the change in hemoglobin levels has a margin of error no more than 0.2 g/dL and the difference in the stand deviation between the mean hemoglobin levels for the two forms of iron supplements used to treat anemia is 1.2 g/dL, what is the desired number of recruits for the study, assuming the individuals will participate in a crossover trial, if the study’s attrition rate is expected to be .25? Group of answer choices n= 139 n= 186 n= 554 n= 55,320

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