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Suppose there are two samples of size 6 and 7, with a rank sum of 58 in the sample of size 6. Using the Wilcoxon rank sum test, evaluate the significance of the results, assuming there are no ties.
Translate this into a statistical hypothesis-testing problem and carry out the test. Be sure to give the null and alternative hypotheses, the value of the test statistic, the p-value, and your conclusions.
Is there a difference in the mean allowances nationally and the mean allowances in northwestern Ohio for nine-year-olds?
Suppose these data represent whole population. Determine the population mean and population standard deviation.
a) Explain why it would be hard to take a Simple Random Sample? b) Describe how to take a cluster sample of chocolate chip cookies.
Carry out F test for significance of straight line regression of Y on X and interpret your results.
The quality control department of Widgets Manufacturing needs your help. They can't decide which significance level is appropriate for testing the claim that fewer than 50% of widgets from a production run are defective.
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..
If a randomly selected student is a female student, what is the probability she is a C student?
The significance level of a statistical test is equal to the probability that the null hypothesis is true.
Hypothesis test for the difference between two means - Assume the population standard deviations are not the same. At the 0.05 significance level, is there a difference in the mean waiting time?
Find the P-value that would be used to determine if the percentage of customers who prefer mint chocolate chip ice has increased at a 5% level of significance.
Computing relative frequencies in a contingency table and a survey of a sample of 347 people is conducted. The survey's respondents are classified according to their political affiliation and their opinion on a bill.
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