455-464) describes an experiment in which male athletevolunteers who were considered low caffeine consum-ers were assigned at random to one of two experimentalgroups. Those assigned to the caffeine group drank abeverage which contained caffeine 1 hour before anexercise session. Those in the no-caffeine group drank abeverage that did not contain caffeine 1 hour before anexercise session. That night, participants wore a devicethat measures sleep activity. The researchers reported thatthere was no significant difference in mean sleep durationfor the two experimental groups. In the context of thisexperiment, explain what it means to say that there is nosignificant difference in the group means. In particular,explain if this means that the mean sleep durations for thetwo groups are equal.

It is given that there is no significant difference in the group means.The null and the alternative…

Answered: 455-464) describes an experiment in…

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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A large clinical trial of the effect of diet on breast cancer assigned women at random to either a normal diet or a low-fat diet. To check that the random assignment did produce comparable groups, we can compare the two groups at the start of the study. Asked if there is a family history of breast cancer: 1276 of the 5964 women in the low-fat group and 1507 of the 7726 women in the control group said "Yes." If the random assignment worked well, there should not be a significant difference in the proportions with a family history of breast cancer. How significant is the observed difference? State: Is there evidence of a difference in the proportion of women with a family history of breast cancer between the treatment and control groups? Plan: Let pi be the proportion for the treatment group, and Pz the proportion for the control group. State the hypotheses for your test. Ha:Pi + P2 Solve: Give the value of the test statistic. Use the calculator. Select an answer ♥ Ho:pi = p2 What is the…
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High levels of cholesterol in the blood are associated with higher risk of heart attacks. Will using a drug to lower blood cholesterol reduce heart attacks? The Helsinki Heart Study recruited middle-aged men with high cholesterol but no history of other serious medical problems to investigate this question. The volunteer subjects were assigned at random to one of two treatments: 2051 men took the drug gemfibrozil to reduce their cholesterol levels, and a control group of 2030 men took a placebo. During the next five years, 56 men in the gemfibrozil group and 84 men in the placebo group had heart attacks. Is the apparent benefit of gemfibrozil statistically significant? State the Null and Alternative Hypotheses. Make sure to define your parameters.
11

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