Question

mean is very close to the sample mediarn. that the waiting time is more than 30 days? Which sample, a or b, offers more compelling A. It is impossible to tell from the box plots. evidence B. The two sample offer about the same evidence C. Sample B D. Sample A Write the letter of each correct statement Concept 8, when calculating a 95% confidence interva important situation where use of the t distribution would be better distribution? for a population mean, which is the most than use of the normal A. When the sample size is small. B. when the population standard deviation is unknown. C. when the sample standard deviation is unknown. D. When the population standard deviation is known. E. When the sample size is large Circle the best choice: ABCD E For 9 and 10: Suppose we were of buyers of new imported cars mean age comparing the mean age of buyers of new domestic cars to the mean age Concept 9. What is the variable under consideration? A. age of buyers D. None of the above B. buyers of imported cars C. buyers of domestic cars Concept 10. What are the two populations under consideration? A. age of buyers of new domestic cars and age of buyers of new imported cars B. cars and buyers C. buyers of new domestic cars and buyers of new imported cars D. None of the above Part II Problems (150 points) (a) Let A and B be two events. Suppose that the probability that neither event occurs is 3/8. What is the probability that at least one of the events occurs? (b)Let C and D be two events Suppose P(C)-05, PIC n D)-0.2 and P { (CU D)c } 0.4. What is P {D}? 2. An urn contains 6 red marbles and 4 black marbles. Two marbles are drawn without replacement from the urn. What is the probability that both of the marbles are black? 3. An advertisement for a cold relief claims an 80% success rate. Eight patients selected at random from a large population of patients are given this cold relief. Assume that the claimed success rate is correct. Find the probability that this treatment will be successful for seven or more of these eight patients 4. A fair die is rolled and a fair coin is tossed. Find the probability that the die shows an odd number and the coin shows a head The histogram below gives the length of service of members of the Department of English at a particular university. The classes, in years of service, are 0-4.9, 5-9.9, etc. and the vertical axis represents the number of faculty. What percent of the faculty have less than 10 years of service? 5.

Answer 1

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CONCEPT 8 ::-

when calculating a 95 % confidence interval for a population mean , the most important situation for using t-distribution is:

B.) When the population standard deviation is unknown.

CONCEPT 9 ::- The variable under consideration is:

A.) Age of buyers.

CONCEPT 10::- The two populations under consederation is :

C.) Buyers of new domestic cars and buyers of new imported cars.

AS FOR GIVEN DATA WE ANSWER ONE QUESTION ONLY... I HOPE YOU UNDERSTAND..

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