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Question: A business statistics instructor at State University has been experimenting with her testing procedure. This term, she has taken the approach of giving two tests over each section of material. The first test is a problem oriented exam, in which students have to set up and solve applications problems. The exam is worth 50 points. The second test, given a day later, is a multiple choice test, covering the concepts introduced in the section of the text covered by the exam. This exam is also worth 50 points. In one class of 15 students, the observed test scores over the first section of material in the course are contained in the file State University.
a. If the instructor is unwilling to make the assumptions for the paired-sample t-test, what should she conclude based on these data about the distribution of scores for the two tests if she tests at a significance level of 0.05?
b. In the context of this problem, define a Type II error.
(c) What is the mean and standard deviation of orders received per day?
The test results indicate that the disease is present. What is the probability that the person actually has the disease?
After entitlement was entered in Step 1 of the regression equation, entitlement accounted for 3% of the variance in rage when it was entered in Step 2. Does entitlement appear to mediate the effects of narcissism on rage?
Suppose all five adults have celiac disease. Do you believe the claim concerning the percentage of adults with celiac disease? Justify your answer.
Fast ‘n Clean operates 12 laundromats on the east side of the city. All of Fast ‘n Clean's clothes dryers have a label stating "20 minutes for $1.00." Conduct the same two-tail hypothesis test, but this time use the confidence interval app..
NASA's astronaut crew currently includes 10 mission specialists who hold a Ph.D. in either astrophysics or astromedicine.
For a random sample of 200 undergraduates he finds that 70 have some kind of allergy. What is the standard error of the sample proportions?
Assume that demand for the upcoming weekend is normally distributed with a standard deviation of 30.
Compare the results to those in Figures. Does it seem reasonable that the information given in Table could be a sample from the population depicted in these figures?
For each, develop a hypothesis that is suggested by the saying and a prediction that follows from the hypothesis.
Find a 90% confidence interval for the population mean weight of all such turtles.
a light bulb company is studying defects in their lightbulbs 4 of the bulbs have defects in the glass but not the coil
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