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A researcher claims that the average age of people who buy theatre tickets is 51. A sample of 30 is selected and their ages are recorded as shown below. The standard deviation is 5. At a = 0.01 is there enough evidence to reject the researchers claim? Show all work.
70 47 34 45 71 54 52 52 32 56
45 46 60 54 48 54 47 46 58 47
61 45 72 56 46 50 80 55 47 54
A human resources director, on learning about the regression effect, decides to hire people who have been fired by their previous employer for poor performance.
At the .05 significance level, can we conclude that the guideline is still reasonable?
Suppose that students in a particular school are all very competent. For each individual, the probability that they will pass the proficiency exam (independent of thier classmates) is 0.99
In a survey of the 3000 boy scouts in the National Capital Area Council (NCAC), it is found that they have a mean weight of 135 lbs with a standard deviation of 15 lbs. How many of the boy scouts have weights between 120 lbs and 150 lbs.?
The average could be a poor estimate of the spending of all teenagers given that only teenagers in malls were sampled.
In studying the performance of the comapany's stock investments over the past year, the research manager of a mutual fund company finds that only 43% of the stocks returned more than the rate that had been expected at the beginning of the year.
Consider the following frequency table of the performance ratings on a scale of 1-good, 2-fair, and 3-poor, bestowed on their local baseball team by a collection of 100 fans:
Suppose the population is normally distributed they make a decision to do a hypothesis test.
You perform a one sample mean hypothesis test on a random sample of data and observe a p-value of 0.2157. What is the appropriate conclusion? Conclude at the 5% level of significance.
Infer that the difference in the level of satisfaction with service between the two branches.
The world record time (in minutes) in the marathon is plotted versus the year in which the record was set for men and women separately. The plotting symbol o is used for men and x for women. The data include only records set between 1908 and 1988.
Markets can be segmented by the following variables: geographic, demographic, social, or behavior. If you were to select a segmentation variable suited best for the motorcycle market, which variable would you select?
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