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Two years ago, a complete survey of all students in a large university indicated that the mean number of cigarettes smoked per day by male students was 8.3 with a standard deviation of 3.7.The director of student health services wishes to determine whether or not smoking habits among male students at the university have changed over the 2-year period. She obtains the following results for the men from a recently selected random sample of students (in cigarettes smoked per day): X 7.7, n 108.
(a) Set up H0 and HA.
(b) Perform the statistical test (.05).
(c) Draw final conclusions.
In 2002, Colorado experienced a drought and many towns on the front range issued either mandatory or voluntary water restrictions on outdoor watering. The data file drought .txt contains data from five front range towns on their June 2001 and June..
Please perform a hypothesis test using a .05 significance level on the following information. Next please perform a regression analysis as well as providing a scattered diagram.
Your friend Elizabeth is the owner of a trendy delicatessen in downtown Seattle, Washington called Zeli's Deli, which is actually stationed on a food truck.
The Department of Education would like to determine if there are gender differences in the performance of twins on the state mandated mathematics examination. As a result, they have collected data on twelve sets of twins that are male and female. ..
A candy bar manufacturer is interested in trying to estimate how sales are influenced by the price of their product. To do this, the company randomly chooses 6 small cities and offers the candy bar at different prices.
testing the significance of correlation.a manufacturer must decide whether to extend credit to a retailer who would
Perform a hypothesis test to determine if there is a significant correlation (α =0.05) between number of hours of overtime worked and hours of sleep
In a survey, Fortune rated companies on a 0 to 10 scale. A random sample of 10 firms and their scores is as follows.- Construct a 95% confidence interval for the average rating of a company on Fortune's entire list.
1 a set of 50 data values has a mean of 15 and a variance of 25.nbsp find the standard score of a data value
To report their finding they want to create a 90% confidence interval. What would be the margin error for this confidence interval?
Assume that the amount of time (in minutes) for eighth graders to compete an assessment examination is 78 minutes with a standard deviation of 12 minutes.
Suppose the NLDN takes a random sample of n = 50 square kilometers instead. Explain how the central limit theorem allows us to find the probability.
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