Create and interpret a 90% confidence interval for theparameter of interest. A retail store is considering adding a new product lineto its inventory. The store wants to know whether thenew product line will be popular with customers. Todetermine this, they take a random sample of customersand ask if they would be interested in buying the newproduct line. Of the 125 people they asked, 70 wereinterested in this new product line. The manager isinterested in creating a 90 % confidence interval regardingthe population parameter.

Let p be the population proportion of people who were interested in the new product line.Given…

Answered: Create and interpret a 90% confidence…

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 company manufactures a certain over-the-counter drug. The company samples 80 pills and finds that the mean amount of drug in the pills is 325.5 mg with a standard deviation of 10.3 mg. Find the 90% confidence interval for the mean of all the pills.
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We have developed a new drug used to reduce fever and want to test its efficacy. Ten ER patients who are running a fever agree to take the new drug instead of the traditional treatment. Their temperatures are taken before the drug is administered and 30 minutes after taking the drug. The results are recorded in the Excel file below. Use the data to construct and interpret a 99% confidence interval for the mean change in temperatures of patients after taking this drug using Excel. Be sure to include any explanation necessary along with a sentence that explains what the interval means. First Temp Second Temp 100.1 98.9 101.3 99.1 102.1 99.2 102.7 99 101.9 98.7 100.8 98.6 103.1 99.4 102.5 99.2 103.5 100.1 101.7 99.2
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Describe three important properties of confidence intervals.
A study is conducted by a physical therapist to determine whether there is a difference in the proportion of men and women in the U.S. that participate in regular sustained physical activity. It is found that 22% of menout of 550 and 19.5% of women out of 450 participated in regular sustained physical activity. Construct a 90% confidence interval for the difference in proportions of men and women that participate in regular sustained and state your conclusion.
A recent poll indicated that 42% of men supported raises taxes to fund additional park services. The poll also found that 64% of women supported such a tax. The sample consisted of 29 men and 25 women. Construct a 90% confidence interval around the difference in proportions.

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Create and interpret a 90% confidence interval for the parameter of interest.