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You decide to conduct a survey of a sample of 25 members of this year's graduating class and find that the average GPA is 3.2. The standard deviation of the sample is 0.4. Over the last ten years, the average GPA has been 3.0. Is this year's class significantly different from the long-run average? At what alpha level would it be significant?
What is the probability that no requests for assistance are in the system? What is the average number of requests that will be waiting for service? What is the average waiting time in minutes before service begins?
Extrapolating this data by using the sum of squares method would further reveal any discretionary variances in relationship to the mean?
Are the following statements a valid pair of null and alternative hypothesis?
Perform a significant test to assess whether there is an association between mortality from cirrhosis of the liver and duration of employment in the group hired after 1945. Report a p-value.
If W denotes the total number of spaces one moves under these special conditions, find the mean and standard deviation of W.
A sample of 350 hats is selected and the sample mean is 3.25 pounds. Using a level of significance of .10, is there evidence that the population mean weight of the hats is greater than 3.5 pounds? Fully explain your answer.
Frequent checks of unfilled orders at end of day reveal that distribution of unfilled orders follows Poisson distribution with mean of two orders. Sketch the histogram representing Poisson probability distribution of unfilled orders.
Assume the likelihood that any flight on Northwest Airlines arrives within 15 minutes of the scheduled time is .90. We select four flights from yesterday for study.
A skeptical paranormal researcher claims that the proportion of Americans that have seen a UFO is less than 1 in every one thousand. State the null hypothesis and the alternative hypothesis for a test of significance.
Standard deviation of 12 years. Worker is stopped at random and asked to fill out questionnaire. Determine the probability that this worker is less than 30 old?
How large a sample should you take if you want to be 95% confident of the results and you want the error of the confidence interval to be no more than .05?
A linear regression between Y and X produced the following equation for the least squares line:
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