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A vice president for marketing recruits 20 college graduates for management training. Each of the 20 individuals is randomly assigned, 10 each, to one of the two groups. A "traditional" method of training (T) is used in one group, and an "experimental" method (E) is used in the other. After the graduates spend six months on the job, the vice president ranks them on the basis of their performance, from 1 (worst) to 20 (best), with the following results (stored in the file TestRank);
T: 1 2 3 5 9 10 12 13 14 15
E: 4 6 7 8 11 16 17 18 19 20
Is there evidence of a difference in the median performance between the two methods? (Use x = 0. 05).
Calculate the standard deviation for this data = since it is a case of grouped data with classes. use group or class midpoints in the formula in place of x values.
Sample data was collected in a study of calcium supplements and their effects on blood pressure. A placebo group and a calcium group began the study with blood pressure measurement.
State the null and the alternative hypotheses. Using the p-value approach, test to determine whether or not the mean age of all employees is significantly more than 40 years.
Suppose that you wish to perform a nonparametric test for a difference among the medians of three or more independent populations. Which of these tests would be appropriate?
Normal adult Mean Temperature is 98.2 and standard deviant is 0.62 with normal distribution. If 16 people are randomly selected determine the probability that their mean body temp is below 98.5 degrees.
In the construction of confidence intervals, if all other quantities are unchanged, an increase in the sample size will lead to a ____________ interval.
Estimate the indicated probability by using the normal distribution as an approximation to the binomial distribution.
a bank has the following data on the gender and marital status of 200 customers: single 20 male 30 female, married male 100 female 50,
Setermine the probability that a specific driver had exactly two violations?
Using sample, determine a 98% confidence interval for mean weight of whole daily output.
It is estimated that .44 percent of the callers to the customer service department of Dell Inc. Will receive a busy signal. What is the probability that of today's 1200 callers at least 5 will receive a busy signal? Use the poisson approximation t..
Certo has complained that he was misrated on his January mission. Both ratings should be 10's, he claims to the chief, who agrees and recomputes the schedule. Do any changes occur over the schedule set in part (b)? What are the strengths and weakn..
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