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Do students at various colleges differ in how sociable they are? Twenty-five students were randomly selected from each of three colleges in a particular region and were asked to report on the amount of time they spent socializing each day with other students. The results for College X was a mean of 5 hours and an estimated population variance of 2 hours; for College Y, M = 4, S2 = 1.5; and for College Z, M = 6, S2 = 2.5. What should you conclude? Use the .05 level. (a) Use the steps of hypothesis testing, (b) figure the effect size for the study; and (c) explain your answers to (a) and (b) to someone who has never had a course in statistics.
Suppose two-tailed test, state hypotheses (Ho and H1 ) for two-tailed test. Using symbols, define hypotheses (Ho and H1) for two-tailed test.
A random sample of 50 female CFO's and a random sample of 40 male CFO's are selected. Find the expected value of the sample mean difference.
At the .05 level of significance, can we conclude that those joining Weight Reducers on average will lose less than 10 pounds? Determine the p-value.
American food will cause an increase in weights. Use the .01 significance level. A random sample of 11 international students is chosen for the study. What is your conclusion?
Compute the two groups using Paired sample t-test. Compute which modification reduced the number of traffic accidents
Is it likely that you will answer at least forty-four questions correctly on the test? Explain. John randomly guesses to answer each question. Is his score of thirty-four out of eighty-eight unusual? Explain
If they didn't launch new mixing plant another alternate can contribute twenty five million profit for the same period (i.e. estimated 6 years). Draw the complete decision tree and determine whether the product should be launched or not.
If the people on your floor of the dorm bought 200 of those tickets, what is the probability that someone on your floor will hold the winning ticket?
On page 336 of the text we are given a formula to calculate the minimum necessary sample size n. When we do not know the estimates p hat and q hat, we are told to use a value of 0.5 for each of them. Why?
Inventory manager for Itex received wheels bearing from Wheel - Rite a small producer of metal parts , Unfortunately , Wheel -rite can only produce 500 wheel bearings from wheel rite each year.
The mean is a useful measure, but it can be misleading. Describe a circumstance when the mean is very useful as the average and a circumstance when the mean is very misleading as the average.
Clearly identify the independent and dependent variables you would study. Determine whether a one-tail or two-tail test is most appropriate and explain why. Generate a testable null statistical hypothesis and an alternative statistical hypothesis.
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