Does this diet help? A group of 79 people enrolled in a weight-loss program that involved adhering to a special diet and to a daily exercise program. After sixmonths, their mean weight loss was 23 pounds, with a sample standard deviation of 9 pounds. A second group of 45 people went on the diet but didn't exercise.After six months, their mean weight loss was 14 pounds, with a sample standard deviation of 7 pounds. Construct a 95% confidence interval for the meandifference in weight losses. Let µ, denote the mean weight loss of the group with daily exercise. Use tables to find the critical value and round the answers tothe nearest integer.A 95% confidence interval for the difference in the mean difference in weight loss, in pounds, is

Solution: Given information: n1= 79 Sample size of daily exercise n2= 45 Sample size of not daily…

Answered: Does this diet help? A group of 79…

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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The principal at a large high school claims that students spend at least 10 hours per week doing homework, on average. To investigate this claim, an AP Statistics class selected a random sample of 250 students from their school and asked them how long they spent doing homework during the last week. The sample mean was 10.2 hours and the sample standard deviation was 4.2 hours. Construct and interpret a 95% confidence interval for the mean time that students at this school spent doing homework in the last week. Based on your interval, what can you conclude about the principal's claim? What is your t* value? Remember to use the conservative DF value.
A study was conducted to estimate hospital costs for car accident victims who woreseat belts. Suppose that 46 randomly selected cases had an average of $15150and a standard deviation of $8500. If the average hospital costs for those that didnot wear seatbelts was $19000, construct a 90% confidence interval to see if theaverage costs are significantly different.
Afra is working in a bank. She has randomly contacted 36 customers and has examined their average annual salary. She found that the average salary of this sample of customers is $68200 with a sample standard deviation of $2375. She needs to report the population average at 95% confidence interval. What is the range that she should report?
From a random sample of 48 days in a recent year, U.S. gasoline prices had a mean of $2.34 and a standard deviation of $0.32. Construct a 95% confidence interval for the population mean
A grocery store manager would like to have an idea concerning the average amount milk the store sells perday. In a sample of 64 days, the average amount number of gallons sold was 122 with a standard deviation of 16 gallons. What is the upper bound of the 95% confidence interval? Use 2 decimal places for your answer.
A common claim is that garlic lowers cholesterol levels. In a test of effectiveness of garlic, 49 subjects were treated with doses of raw garlic, and their cholesterol levels were measured before and after treatment. The changes in their levels of cholesterol (in mg/dL) have a mean of 0.4 and a standard deviation of 21.0. Construct a 98% confidence level estimate of the mean net change in cholesterol after the garlic treatment. What does the confidence interval suggest about the effectiveness of garlic in reducing cholesterol and why?

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