Q: We have a sample of municipal mutual funds that report their return
We have a sample of municipal mutual funds that report their return (%) in the previous 3years and the previous 5 years. 1. Create a 95% confidence interval for the difference in rate of return for th...
See AnswerQ: In 2002 the Veritas Software company found out that its chief financial
In 2002 the Veritas Software company found out that its chief financial officer did not actually have the MBA he had listed on his resume. They fired him, and the value of the company stock dropped 19...
See AnswerQ: In preparation for a regional paper airplane competition, a student tried
In preparation for a regional paper airplane competition, a student tried out her latest design. The distances her plane traveled (in feet) in 11 trial flights are given here. (The world record is an...
See AnswerQ: Here are data on 32 light water nuclear power plants. The
Here are data on 32 light water nuclear power plants. The variables are: Cost: In $100,000, adjusted to 1976 base. Date: Date that construction permit was issued in years after 1900. Thus, 68.58 is ro...
See AnswerQ: Two companies market new batteries targeted at owners of personal music players
Two companies market new batteries targeted at owners of personal music players. DuraTunes claims a mean battery life of 11 hours, while RockReady advertises 12 hours. 1. Explain why you would also li...
See AnswerQ: At a barbershop music singing competition, choruses are judged on three
At a barbershop music singing competition, choruses are judged on three scales: Music (quality of the arrangement, etc.), Performance, and Singing. The scales are supposed to be independent of each ot...
See AnswerQ: Using a Simple Random Sample, a student group asked 450 students
Using a Simple Random Sample, a student group asked 450 students about their sleep and study habits and received about 200 responses. The group wanted to know if the average amount of sleep varied by...
See AnswerQ: The survey in Exercise 14 also asked students about the number of
The survey in Exercise 14 also asked students about the number of hours they studied. Those doing the survey wanted to know if the average amount of studying varied by sex or by class of the responden...
See AnswerQ: We have data on Old Faithful eruptions that includes another variable recording
We have data on Old Faithful eruptions that includes another variable recording the Day on which the eruption occurred (where 1 is the first day and each successive day just counts one more). The corr...
See AnswerQ: The Insurance Institute for Highway Safety publishes data on a variety of
The Insurance Institute for Highway Safety publishes data on a variety of traffic related risks. One report gives the numbers of people killed in highway accidents during each year from 1975 to 2013....
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