Stat Mock Exam – Flashcards
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A bank surveyed all of its 60 employees to determine the proportion who participate in volunteer activities.
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E. The bank does not need to use an inference procedure to determine the proportion of employees who participate in volunteer activities because the survey was a census of all employees.
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Approximately, what would be the weight of a female grizzly bear with the same standardized score as a male grizzly bear with a weight of 530 pounds?
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B. 324 pounds
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The profit, Y, in dollars, for a particular order can be described by Y= 75X - 100. What is the standard deviation of Y?
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B. $432.00
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If the reported percent has a margin of error of 2.7 percentage points, which of the following is closest to the level of confidence?
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B. 90.0%
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(CDs) Which of the following gives the conclusion that should be made based on the results and provides the best explanation for the conclusion?
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D. It is reasonable to conclude that the difference in sales was caused by the different cover designs because the cover designs were randomly assigned to stores.
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The manager continues this experiment for many days, Which of the following best describes the manager's study?
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A. A completely randomized design.
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In the design of a survey, which of the following best explains how to minimize response bias?
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E. Carefully word and field-test survey questions.
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For a sample of 42 rabbits, the mean weight is 5 pounds and the standard deviation of weights is 3 pounds. Which of the following is most likely true about the weights for the rabbits in this sample?
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C. The distribution of weights is skewed to the right because the least possible weight is within 2 standard deviations of the mean.
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Some people claim the procedure being used does not permit the results to be extended to all registered voters. Which of the following is NOT a legitimate concern about the procedure being used?
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B. Registered voters with unlisted telephone numbers may be underrepresented in the sample.
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A complex electronic device contains three components, A, B, and C. The probabilities of failure for each component in any one year are .01, .03, and .04. If the components fail independently of one another, what is the probability that the device will not fail in one year?
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D. 0.922
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What is the point estimate for the proportion of hotel reservations that are canceled on the intended arrival day from which this interval was constructed?
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C. 0.080
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When using a one-sample t-test to construct a confidence interval for the mean of a finite population, a condition is that the population size be at least 10 times the sample size. The reason for the condition is to ensure that...
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D. the degree of dependence among observations is negligible.
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The expected value for the net gain for each ticket is -$0.95. What is the meaning of the expected value in this context?
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B. The ticket owners lose an average of $0.95 per raffle ticket.
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For a fixed sample size and significance level, the power of the test will be greatest if the actual mean is which of the following?
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A. 8
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A random sample of 50 students at a large high school resulted in a 95 percent confidence interval for the mean number of hours of sleep per day of (6.73, 7.67). Which of the following statements best summarizes the meaning of this confidence interval?
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B. About 95% of all random samples of 50 students from this population would result in a 95% confidence interval that covered the population mean number of hours of sleep per day.
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A random sample of 432 voters revealed that 100 are in favor of a certain bond issue. A 95 percent confidence interval for the proportion of voters who are in favor of the bond issue is...
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0.231 + or - 1.96(square root of .231*.769 divided by 432
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If the student leaves home at 8:25 A.M. what is the probability that the student will arrive at the college campus later than 9 A.M.?
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A. 0.16
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If the experimenter had conducted a one-tailed test on the same set of data, which of the following is true about the possible p-value(s) that the experimenter could have obtained?
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D. The possible p-values are 0.22 and 0.88
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If the drug had no effect whatsoever, which of the following experimental results would be anticipated?
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E. I, II, and III
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Assuming that conditions for inference are satisfied, which of the following gives the margin of error for the confidence interval?
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A. (2.228)(0.745)
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If there are 5 choices for each question, what is the minimum number of choices that the student must eliminate before it is advantageous to guess among the rest?
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C. 2
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Given that the new microwave oven is damaged during delivery, what is the probability that it stops working in less than 2 years?
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D. 0.40
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If all possible simple random samples of size 100 are drawn from this population and the mean is computed for each of these samples, which of the following describes the sampling distribution of the sample mean?
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A. approximately normal with mean $206,274 and standard deviation $3,788
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To study this, she gathers information on the number of hours of exercise per week from a random sample of East Coast adults and a random sample of West Coast adults. Which of the following might be an appropriate null hypothesis for this study?
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B. The average number of hours of exercise per week for East Coast adults is the same as the average number of hours of exercise per week for West Coast adults.
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If the possible choices for n are n=10, n=20, and n=100, which value of n should the player choose in order to maximize the probability of winning a prize?
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A. n=10 only
