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1. Before installing a high-tech laser exhibit near the exit area, a museum of American technology found the average contribution by patrons was $2.75 per per- son. For a sample of 30 patrons following installation of the new exhibit, the contributions are as listed in data file XR10108. Based on the sample data, and using the 0.025 level of significance, can we conclude that the new exhibit has increased the average contribution of exhibit patrons? Identify and interpret the p-value for the test.
2. According to the U.S. Department of Justice, 25% of violent crimes involve the use of a weapon. We will assume that data file XR10109 contains a sample of the crime information for a given city, with data for the 400 crimes coded as 1 5 crime involved a weapon and 2 5 crime did not involve a weapon. Using the 0.05 level in a two-tail test, was the percentage of violent crimes involv- ing a weapon in this city significantly different from the 25% in the nation as a whole? Identify and interpret the p-value for the test. Source: Bureau of the Census, Statistical Abstract of the United States 2009, p. 194.
A random sample of 50 female CFO's and a random sample of 40 male CFO's are selected. Find the expected value of the sample mean difference.
The problem relates to Basic Statistics and it is about compute the number of female physicians in a university to be above the average number of 27.9 percent. The computations for this have been given in the solution in detail
an elevator can carry up to 3500 pounds. the manufacturer has included a safety margin of 500 pounds and lists the
A sample of 20 cigarettes is tested to determine nicotine content and the average value observed was 1.2 mg. Compute a 99 percent two-sided confidence interval for the mean nicotine content of a cigarette if it is known that the standard deviation..
the photoresist thickness in semiconductor manufacturing has a mean of 10 micrometers and a standard deviation of 1
An efficiency study was done on the delivery of first-class mail originating from the four cities listed in the following table. Recorded for each city was the average length of time (in days) that it took a letter to reach a destination in t..
What is the best point estimate of the population mean and what is a reasonable range of values for the population mean, i.e. upper and lower end of the confidence interval?
What does the coefficient of determination tell you about the variation attendance and the variation in the number of exhibitors?
for the following find the appropriate 95 confidence interval for the corresponding population proportiona sample size
the national high school sports database reports that players of lacrosse average 55 goals per season. the standard
A t-distribution to create 90% confidence interval for population mean. If convenient, use technology to create the confidence interval.
the mean of a normal distribution is 415 pounds. the standard deviation is 12 pounds. what is the area between 420
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