Assessing teenagers' mean systolic blood pressure is of interest to a medical research team. They are aware that the population's standard deviation is 10 thanks to earlier research. How many teens should be included in

Assessing teenagers' mean systolic blood pressure is of interest to a medical research team. They are aware that the population's standard deviation is 10 thanks to earlier research. How many teens should be included 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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Low-fat or low-carb? Are low-fat diets or low-carb diets more effective for weight loss? A sample of 77 subjects went on a low-carbohydrate diet for six months. At the end of that time, the sample mean weight loss was 4.4 kilograms with a sample standard deviation of 7.3 kilograms. A second sample of 81 subjects went on a low-fat diet. Their sample mean weight loss was 2.7 kilograms with a standard deviation of 5.8 kilograms
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Head Start is an enrichment program for young children. The program’s administrators would like to know if this program is successful in increasing the intelligence (IQ) of its participants. They know that the IQs of children who enter the program have a mean of 88 and a standard deviation of 15 points. A sample of eighty students has an average IQ of 88.8. Has the program increased the students’ IQs?
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What value of z would you use to calculate the 98% confidence interval for a population mean, given that you know the population standard deviation, the sample size and the sample mean of your sample?
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A successful basketball player has a height of 6 feet 11 inches, or 211 cm. Based on statistics from a data set, his height converts to the z score of 5.17. How many standard deviations is his height above the mean?
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