A researcher compares the effectiveness of two different instructional methods forteaching anatomy. A sample of 218 students using Method 1 produces a testingaverage of 58.7. A sample of 243 students using Method 2 produces a testing averageof 54.7. Assume that the population standard deviation for Method 1 is 18.63, whilethe population standard deviation for Method 2 is 16.17. Determine the 95%confidence interval for the true difference between testing averages for students usingMethod 1 and students using Method 2.Step 1. Find the point estimate for the true difference between the population means.Answer:_pointsStep 2. Calculate the margin of error of a confidence interval for the difference betweenthe two population means. Round your answer to six decimal places.pointsAnswer:Step 3. Construct the 95% confidence interval. Round your answers to one decimalplace.Answer: Lower endpoint:Upper endpoint:

Answered: Image /qna-images/answer/44e8e64c-8322-4820-a5f9-ba87ee597da1.jpg

Answered: A researcher compares the effectiveness…

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 study is run comparing HDL cholesterol levels between men who exercise regularly and those who do not. The 50 men who exercise regularly have a mean HDL of 48.5 with a standard deviation of 12.5. The 100 men who do not exercise regularly have a mean of 56.9 with a standard deviation of 11.9. Construct a 95% confidence interval for the difference between means, assuming equal variance. Give an interpretation of the confidence interval. You MUST show your work
The quality control manager of a car antifreeze manufacturer wants to find the fluctuations in the amount of antifreeze solution that a container can hold. She selects a sample of 18 such container and arrives at an average of 3787 lb., and a s. d. of 55.4 lb. Using this sample data construct a 95% confidence interval for the standard deviation of the car antifreeze.
In a random sample of eight cell phones, the mean full retail price was $431.50 and the standard deviation was $226.00. Assume the population is normally distributed and use the t-distribution to find the margin of error and construct a 90% confidence interval for the population mean μ. Interpret the results.
In a random sample of seven cell phones, the mean full retail price was $474.50 and the standard deviation was $189.00. Assume the population is normally distributed and use the t-distribution to find the margin of error and construct a 99% confidence interval for the population mean μ. Interpret the results.
In an old study, the weight of a certain breed of pig had a standard deviation of 3.8 pounds. What sample size should be used to estimate the mean weight of that breed of pig for a new study? Assume a margin of error of 0.7 pounds and a confidence level of 99% is desired.
Mrs. Gallas wanted to estimate the average weight of an Oreo cookie to determine if theaverage weight was less than advertised. She selected a random sample of 30 cookies andfound the weight of each cookie (in grams). The mean weight was = 11.1921 grams with astandard deviation of sx = 0.0817 grams. Make a 95% confidence interval to estimate the truemean weight of an Oreo. 1. What is the formula for calculating the standard deviation of the sampling distribution of x? 2.What condition must be met to use this formula? Has it been met?
Assume a researcher wants to compare the mean Alanine Aminotransferase (ALT) levels in two populations, individuals who drink alcohol and individuals who do not drink alcohol. The mean ALT levels for the individuals who do not drink alcohol is 32 with a standard deviation of 14, and 37 individuals were in the sample. The mean ALT levels for individuals who drink alcohol is 69 with a standard deviation of 19, and 38 individuals were in the sample. Construct and interpret a 95% confidence interval demonstrating the difference in means for those individuals who drink alcohol when compared to those who do not drink alcohol.
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The International Air Transport Association surveys business travelers to develop quality ratings for transatlantic gateway airports. The maximum possible rating is 10. Suppose a simple random sample of 50 business travelers is selected and each traveler is asked to provide a rating for the Miami International Airport. The ratings obtained from the sample of 50 business travelers provides a mean of 6.34 and a standard deviation of 2.163. Develop a 95% confidence interval estimate of the population mean rating for Miami.
In a random sample of ten cell phones, the mean full retail price was $433.00 and the standard deviation was $208.00. Assume the population is normally distributed and use the t-distribution to find the margin of error and construct a 99% confidence interval for the population mean μ. Interpret the results.
Researchers from a certain country were interested in how characteristics of the spleen of residents in their tropical environment compare to those found elsewhere in the world. The researchers randomly sampled 91 males and 109 females in their country. The mean and standard deviation of the spleen lengths for the males were 10.9 cm and 0.9 cm, respectively, and those for the females were 9.8 cm and 1.1 cm, respectively. Determine a 95% confidence interval for the difference between mean spleen lengths of males and females in this country. Click here to view page 1 of the table of critical values of t. Click here to view page 2 of the table of critical values of t. Let population 1 be all males in the country and let population 2 be all females in the country. The 95% confidence interval for µ1 - 4½ is ( | D (Round to three decimal places as needed. Use ascending order.)
Ann and Tori wanted to estimate the average weight of an Oreo cookie to determine if it was less than advertised (34 grams for 3 cookies). They selected a random sample of 36 cookies and found the weight of each cookie (in grams). The mean weight was x = 11.3921 grams with a standard deviation of sx = 0.0817 grams. Construct and interpret a 90% confidence interval for the true mean weight of an Oreo cookie. We are 90% confident that the interval from 11.355 to 11.429 captures μ the true mean weight for all Oreo cookies. In 90% of all possible samples of size 36, the interval from 11.369 to 11.4152 will capture the true mean weight of all Oreo cookies. We are 90% confident that the interval from 11.369 to 11.4152 captures the true mean weight for all Oreo cookies. We are 90% confident that the interval from 11.369 to 11.4152 captures и the mean weight for Oreo cookies in Ann and Tori's study. We are 90% confident that the interval from 11.364 to 11.42 captures the true mean weight for…

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