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A special industrial battery must have a life of at least 400 hours. A hypothesis test is to be conducted with a .02 level of significance. If the batteries from a particular production run have an actual mean use life of 385 hours, the production manager wants a sampling procedure that only 10% of the time would show erroneously that the batch is acceptable. What sample size is recommended for the hypothesis test (0 decimals)? Use 30 hours as an estimate of the population standard deviation.
Discuss how a t test for a dependent variable can be of great value in applying a new approach to the treatment of aggressive behavior to a small group of students.
You work at a hospital that has always had about 100 emloyees staffed at night. You think that the number of employees staffed at night has recently decreased and would like to test this claim.
Assuming this is literally true, how can it be explained? What facts / statistics would you need to know to expose this misleading claim?
Use descriptive statistics to summarize the data from the two studies. What are your preliminary observations about the depression scores?
If two American adults are randomly selected, what is the probability that neither of them has ever experienced a migraine headache?
Using binomial distribution find the probability that 2 or 3 women in a sample of 20 will never be married.
The owner of Maumee Ford-Mercury wants to study the relationship between the age of a car and its selling price. Listed below is a random sample of 12 used cars sold at the dealership during the last year.
Assume the population standard deviation (s) is 0.5 and the sample size (n) is 100. Calculate the values for alpha, a type I error and beta, a type II error. (To calculate Beta, consider a mean that is 1 standard error away from the lower end valu..
Bill is doing a project for you in the marketing department. In conducting his analysis regarding consumer behavior and a new product that has come out
If 9 loads are chosen at random for a weight check, find the probability that the mean weight of those loads is less than 47.6 tons. Assume that the variable is normally distributed.
What is a Wilcoxon-Whitney Test and when is it used? I am not sure when to use the Wilcoxon-Whitney Test and what it is testing.
A researcher testing the affects of music on studying conducts a within participants design. The results are as follows: music 6,7,6,5,6,8,8, and no music 10,7,8,7,7,9,8
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