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One goal of the research is to compare the mean reaction times of subjects. Explain why the data should be analyzed as a paired-difference experiment.
What assumptions about the distributions of the populations of test scores are necessary to ensure the validity of the inferences you made in parts a and b?
Summarize the results of the hypothesis tests in the words of the problem. Repeat part a for Australian girls.
Market researchers often use mail surveys that do not ask the respondent's identity but contain hidden codes on the questionnaire that identify the respondent.
They can learn the results of the test by telephone, still without giving their name. Does this practice offer anonymity or just con?dentiality?
Coin tossing can illustrate the idea of a sampling distribution. The population is all outcomes (heads or tails) we would get if we tossed a coin forever.
Simulate the sampling distribution of the mean. Continue the previous exercise, using software to illustrate the idea of a sampling distribution.
How would you label the two strata from which you will sample? Use Table B, starting at line 115, to select the ?rst 5 accounts from each of these strata.
Suppose quantity demanded for the good rises by 10 units at every possible price while. Find the new equilibrium price and quantity in this market.
Compute the meet and join of two parallel vectors u and v. The meet should now be symmetric.
What are the probabilities of the six simple events? What is the probability that the number showing is an odd number? at most three?
What is the probability that both students are math majors? What is the probability that at least one of the stu- dents selected is a statistics major?
From the description of the selection process, all outcomes are equally likely. What is the probability of each simple event?
What is the probability that exactly three receive their own books? What is the probability that at least two of the four students receive their own books?
Using the result of Part (b), what is the probability that a hand contains cards from exactly two suits?
What is the probability that grip size is at least inches? What is the probability that the racket purchased has an oversize head (event B)?
Shade the event 1A n B2 C . On a separate Venn diagram shade the event AC U BC. How are these two events related?
Give a relative frequency interpretation of the given probability. How many of the 2329 cardiac arrest sufferers do you think survived? Explain.
What approach (classical, relative frequency, or sub- jective) did you use to obtain the probability in Part (a)? Explain.
What outcomes are contained in B, the event that the two patients have the same status with respect to coverage, and what is P(B)?
What is the estimated probability that the next customer purchases three or fewer CDs? How does this compare to the probability computed in Part (a)?
What can be said about the number of outcomes in the sample space? What outcomes are in the event E, that the number of batteries examined is an even number?
What outcomes are contained in the event A, that exactly one book is examined before the chance ex- periment terminates?
A class has 80 students. Test 2 had a class average of 78 and a variance of 49.
A job has been time-studied for several cycles, and the mean actual time was found to be 1.84 minutes.