Find the right-hand critical value F0 for a two-tailed test using = 0.05, degrees of freedom in the numerator = 5, and degrees of freedom in the denominator = 10.
A) 4.24 B) 4.07 C) 4.47 D) 6.62
Q. 2True or False: Two events, A and B, are independent if P(A and B) = P(A ) P(B).
A) True B) False
Q. 3A salesman boasts to a farmer that his new fertilizer will increase the yield of the farmers crops by 15. The farmer wishes to test the effects of the new fertilizer on her corn yield.
She has four equal sized plots of land one with sandy soil, one with rocky soil, one with clay-rich soil, and one with average soil. She divides each of the four plots into three equal sized portions and randomly labels them A, B and C. The four A portions are treated with her old fertilizer. The four B portions are treated with the new fertilizer. The four C portions receive no fertilizer. At harvest time, the corn yield is recorded for each section of land. What is the claim she is testing? A) The new fertilizer yielded at least a 15 improvement.
B) The total yield increased at least 15.
C) The A sections had at least a 15 increase in yield.
D) The average soil field had at least a 15 increase in yield.
Q. 4The university police department must write, on average, five tickets per day to keep department revenues at budgeted levels. Suppose the number of tickets written per day follows a Poisson distribution with a mean of 6.5 tickets per day.
Interpret the value of the mean. A) If we sampled all days, the arithmetic average number of tickets written would be 6.5 tickets per day.
B) The number of tickets that is written most often is 6.5 tickets per day.
C) Half of the days have less than 6.5 tickets written and half of the days have more than 6.5 tickets written.
D) The mean has no interpretation since 0.5 ticket can never be written.
Q. 5Construct a 99 confidence interval for the population mean, . Assume the population has a normal distribution. A group of 19 randomly selected employees has a mean age of 22.4 years with a standard deviation of 3.8 years.
Round to the nearest tenth. A) (19.9, 24.9 ) B) (16.3, 26.9 ) C) (17.2, 23.6 ) D) (18.7, 24.1 )
Q. 6The tread life of a particular brand of tire is a random variable best described by a normal distribution with a mean of 60,000 miles and a standard deviation of 3000 miles.
What warranty should the company use if they want 96 of the tires to outlast the warranty? A) 54,750 mi B) 65,250 mi C) 57,000 mi D) 63,000 mi
Q. 7True or False: When constructing a confidence interval for the difference of two population proportions, a pooled estimate of p is not required.
A) True B) False
Q. 8True or False: If A and B are independent events, then A and B are mutually exclusive also.
A) False B) True
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