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Question: In each situation, indicate whether you think an observational study or a randomized experiment would be used. Explain why in each case.
a. A teacher wants to compare the grade point averages of female students who are in sororities to the grade point averages of female students who are not in sororities.
b. A doctor wants to compare the effectiveness of two allergy medications.
c. A social psychologist wants to determine whether restaurant servers will get better tips if they introduce themselves by name to the people they serve.
d. A child psychologist wants to find out whether there is an association between the amount of television 6-year-old children watch and how often they bully other children in school.
From the past experience he knows that he population standard deviation is three days in testing to determine his blief he could use one of the following plans n=100 a=.01 n=75, a=.o5 n=50, a=.10.
suppose xyand c represent the length width and perimeter of a flat rectangular sheet metal part. note that xis a normal
1. Three hundred and fifty Kentucky firefighters were asked their perceptions on mandatory sprinkler systems for new homes constructed in their state.
examine each of the following questions for poosible bias. if you think the question is biased indicate how and propose
Construct an appropriate control chart and comment on the process.- How many dietary errors do you predict if no changes are made in the process?
Consider the event that a player scores a point in a game against team A and the event that the same player scores a point in a game against team B.- What is the union of the two events? What is the intersection of the two events?
Determine the mean, median, range, and midrange.- The mean absolute deviation.- The standard deviation and variance.
1. What are the uses of decision analysis? 2. What are the limitations of decision analysis? 3. List the elements of a decision problem, and explain how they interrelate.
You would like to know if operating red-light camera can actually reduce the number of traffic violation. We know that the average number of tickets before the implementation of red-light camera on daily basis was 15.
a major brokerage company has an office in miami florida. the manager of the office is evaluated based on the number of
Complete the ANOVA table.- Is there any evidence of interaction? Use a = 0.01.- Is there any evidence that gender or job type affects the length of employment? Use a = 0.01.
A brand name has 60% recognition rate. if the owner of the brand wants to verify that rate by beginning with a small sample of 5 randomly selected consumers, find the probability that exactly 3 of the 5 consumers recognize the brand name. Also fin..
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