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The average time scheduled for a doctor's visit is 11 minutes with a standard deviation of 4 minutes. A researcher uses a sampling distribution made up of samples of size 91.
According to the Central Limit Theorem, what is the standard error of the mean?
Perform the goodness-of-fit test for these data to determine if these trees are randomly scattered. Write a short report giving the details of your analysis and your conclusion.
A process yields 10% defective items. If 100 items are randomly selected from the process, what is the probability that the number of defectives (a) exceeds 13? (b) is less than 8?
A sample of 64 observations is selected from a normal population. The sample mean is 215, and the population standard deviation is 15. Conduct the following test of hypothesis using the .025 significance level.
In the data collected for construction of c chart, the average number of defects per unit of output is c = 7.5. Discuss the 3-sigma upper and lower control limits for the control chart?
A department head wants to investigate the quality of teaching of a professor who is coming up for tenure.
an investigator hypothesizes that cholesterol levels in children might be effected by educating their parents on proper
a recent survey reported in businessweek dealt with the salaries of ceos at large corporations and whether company
What percent of people surveyed were Republicans?- Do you think this might be a reasonable estimate of the percentage of all voters who are Republicans? Explain.
H0 states that is equal to 25. If n=30 , and x bar = 20 , and sigma = 3. What is the test statistic?
a. Which survey apparently allowed for overlapping categories: the one from 1999 or the one from 2004, or both, or neither?
State your null and alternative hypothesis in a complete sentence.
Setup the alternative hypothesis that will test the claim that the percentage of women preferring white wine is 25% higher than men.
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