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Construct a 99% confidence interval for the mean bill of a customer. A) [31.355, 32.645] B) [29.747, 34.253] C) [29.421, 34.579] D) [29,740, 34.260] E) [28.570, 35.570] Answer: C Type: Computation Difficulty: Medium 34. A random sample of 100 patients, suffering from a particular disease is given a new medicine. Eighty-five of the patients report an improvement in their condition. What is the success rate of the medicine, with a 99% confidence level? A) [0.7669, 0.9331] B) [0.8331, 0.8671] C) [0.7579, 0.9421] D) [0.7422, 0.9578] E) [0.7560, 0.9440] Answer: C Type: Computation Difficulty: Medium 35. If the population standard deviation is not known, what should be used as a point estimate? A) The standard deviation of a few sample means. B) The sample mean. C) The sample standard deviation. D) Any of the above. E) None of the above. 36. When is the t-distribution used in the construction of confidence intervals?
Bbut only 1 percent of those closed will have something stolen. If a garage is robbed, what is the probability the doors were left open?
A noted psychic was tested for ESP. The psychic was presented with 400 cards face down and asked to determine if each card was marked with one of four symbols: a star, cross, circle, or square. The psychic was correct in 120 cases. Let p represent..
Group of businesswomen wish to open a high fashion boutique in a vacant store but only if the average income in the area is at least $45,000. Use alpha=0.01 to test whether or not the businesswomen should open their boutique in this neighborhood.
The monthly cost of a long distance phone plan in dollars is a linear function of the total calling time in minutes. When graphed, the function gives a line with a slope of 0.11.
What is the probability that a simple random sample of 40 male graduates will provide a sample mean within $10,000 of the population mean, $168,000 (to 4 decimals)?
A fast food chain sells its burgers alone or as part of a "value meal" which includes fries and a drink. They know some customers are health conscious.
What is an estimate of the proportion defective for the piston manufacturing process when it is control?
Rrepresented as a table or a graph, both shown below. The random variable xi represents the number of complaints, and p(xi) is the probability of receiving xi complaints.
suppose that 80 of the accounts are in error. What is the probability that the auditor will find that the sample proportion (P) of the accounts in error will exceedd 0.10?
Xerox Claims their copier is the same speed as Cannon's copier. The average speed of cannon's copier is 27 copies per minute. A test of 49 runs is done on the Xerox copier giving a sample mean X = 26 and a sample standard deviation s = 2.65.
A survey found that the variance of the rental rates on 8 cars at the airport was 35.7 while the variance of the rental rates on 5 cars down town was 50.4. What test value should be used in a F test?
When the accountants for lose-a-digit Computer, Inc. had finished preparing their annual budget, they presented the final figures to the president, I.M. Smart.
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