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Final
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Question 1Your answer is CORRECT.A pretzel company calculated that there is a mean of 73.6 broken pretzels in each production runwith a standard deviation of 5.3. If the distribution is approximately normal, find the probabilitythat there will be fewer than 69 broken pretzels in a run.
a) 0.096b) 0.807c) 0.443d) 0.193e) 0.493
Question 2Your answer is CORRECT.An auditor for a hardware store chain wished to compare the efficiency of two different auditingtechniques. To do this he selected a sample of nine store accounts and applied auditing techniquesA and B to each of the nine accounts selected. The number of errors found in each of techniquesA and B is listed in the table below:Errors in AErrors in B2511281726192817323430252929
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20212530Select a 90% confidence interval for the true mean difference in the two techniques. Use theappropriate tables in your book.
Question 3Your answer is CORRECT.A random variable Xhas a probability distribution as follows:X0 1 2 P(X) 3k4k3k5k4What is P(X < 3)?
3
4
k
Question 4Your answer is CORRECT.The following table displays the results of a sample of 100 in which the subjects indicated their
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favorite ice cream of three listed. The data are organized by favorite ice cream and age group.What is the probability that a person chosen at random will be over 40 years old if he or shefavors chocolate?Age Chocolate Vanilla Strawberry Over 40 12 8 20-40 13 8 Under 20 9 17
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Question 5Your answer is INCORRECT.Which of the following would be the most appropriate test of significance for the followingsituation?Does the temperature of what you drink affect your mouth temperature? Randomly selectedsubjects first had their mouth temperature taken. Then, the same subjects were randomly assignedto drink 1/4 cup of cold or hot water and hold it in their mouths for 10 seconds. Then, their mouthtemperatures were measured again. After 20 minutes, the process was repeated using the otherwater temperature treatment.
a) Two Sample Mean t Testb) Two Sample Proportion Z Testc) Matched pairs t testd) One Sample Proportion Z Teste) One Sample Mean t Test
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- Fall '08
- Staff
- Math, Statistics, Normal Distribution, Standard Deviation, Print Test