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Assuming 50,000 individuals in the United States are diagnosed every year, and of those individuals diagnosed with HIV each year, approximately 33,500 individuals diagnosed with HIV are gay or bisexual males. What prevalence of the new HIV cases are from members of the population of gay or bisexual males?
A prospective purchaser wishes to estimate the mean dollar amount of sales per customer at a toy store located in an airport terminal. Based on data from other similar airports, the standard deviation of such sales is about $3.20.
Conduct an analysis of variance test to determine whether there is any evidence that the population mean amount of salt per serving is different for at least two varieties.
eleven patients were weighed before and after a diet which was designed to help patients reduce weight. eight of these
Twenty fake tan products are selected and the amount of dihydroxyacetone (the active ingredient) in each is measured. Describe the population, the sample, and variable in this problem.
Suppose another 2 of the 12 will ask to be placed on the do-not-call list when contacted. What is the probability that these 2 people will not be called?
As a condition of employment, Fashion Industries applicants must pass a drug test. Of the last 220 applicants 14 failed the test. Develop a 99 percent confidence interval for the proportion of applicants that fail the test.
Digital camcorder repair service has set the goal not to exceed average of 5 working days from time unit is brought in to time repairs are completed. Compute the t-value.
Develop a scatter diagram with price as the independent variable and what does the scatter diagram developed in part (a) indicate about the relationship between the two variables?
Review the Learning Resources related to probability, sampling distributions, and confidence intervals. For additional support, review the Skill Builder.
Write a statistical laboratory report using the guidelines in the assigned article, "How to Write a Statistical Report."
Describe the statistical test and the reason for using it. Briefly describe the summary statistics of the participants. What conclusions can you draw and what recommendations could you provide based on this information?
Explain how the shape of the original distribution affects the shape of the sampling distribution. Hint: Consider CLT and symmetry of the original distribution.
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