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The Tampa Bay (FLA) Area Chamber of Commerce wanted to know whether the mean weekly salary of nurses was larger than that of school teachers. It is believed that the historic variances of each group's weekly salary are not the same. To investigate, they collected salary information on the amounts earned last week by a sample of school teachers and nurses. The data can be found on our Excel worksheet.
Is it reasonable to conclude that the mean weekly salary of school teachers is lower at a .05 level of significance? Why?
Are the two groups significantly different at a .05 level of significance? Explain how you arrived at this conclusion.
The following table provides the weight in grams of a sample of 50 bags produced in one hour by a single machine: Compute the arithmetic mean and median.
Use Hypothesis testing to determine if Dr. Boom is correct, that his sample of 25 rockets weight less than the average rocket.
Management of a company is considering adopting a bonus system to increases production. One suggestion is to pay a bonus on the highest 5 percent of production based on past experience.
A Pew research study recently randomly selected two groups of people, men and women and asked them if they agree with the following statement:
The following table gives the median incomes of families by level of income and geographical region.
Given a binomial distribution with n=29 and p=0.83, would the normal distribution provide a reasonable approximation? Why or why not.
The theoretical probability of undesirable side effects resulting from taking Grebex is 2 in 19. If 570 people take Grebex to lower their blood pressure, how many will encounter undesirable side effects?
Using your knowledge of infectious disease epidemiology, quantify the pattern of disease X in this group, i.e., what are the infectivity, pathogenicity, and virulence of disease X?
If the life of wild pheasants follows a normal distribution with a mean of 9 months and a variance of 9, what percent of the population will be less than 11 months of age?
Calculate the limits within which the weight of the packets should lie assuming that the machine is not been classified as faulty.
The distribution of IQ scores is normal, what proportion of the population would score higher than Bob? Lower than Bob?
At the .01 level of significance, do these data support the conclusion that the ferritin distribution in elderly men has a smaller variance than in younger men?
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