It a recent study of college students indicated that 30 of all college students had at least one tattoo. A small private college decided to randomly and independently sample 15 of their students and ask if they have a tattoo.
Use a binomial probability table to find the probability that exactly 5 of the students reported that they did have at least one tattoo.
A) 0.515 B) 0.722 C) 0.207 D) 0.218
Q. 2A recent study suggested that 70 of all eligible voters will vote in the next presidential election. Suppose 20 eligible voters were randomly selected from the population of all eligible voters.
Use a binomial probability table to find the probability that more than 10 but fewer than 16 of the 20 eligible voters sampled will vote in the next presidential election.
A) 0.714 B) 0.845 C) 0.649 D) 0.780
Q. 3A retired statistician was interested in determining the average cost of a 200,000.00 term life insurance policy for a 60-year-old male non-smoker.
He randomly sampled 65 subjects (60-year-old male non-smokers) and constructed the following 95 percent confidence interval for the mean cost of the term life insurance: (850.00, 1050.00). State the appropriate interpretation for this confidence interval. Note that all answers begin with We are 95 percent confidence that
A) The term life insurance cost of the retired statistician's insurance policy falls between 850.00 and 1050.00
B) The average term life insurance cost for sampled 65 subjects falls between 850.00 and 1050.00
C) The average term life insurance costs for all 60-year-old male non-smokers falls between 850.00 and 1050.00
D) The term life insurance cost for all 60-year-old male non-smokers' insurance policies falls between 850.00 and 1050.00
Q. 4A physical fitness association is including the mile run in its secondary-school fitness test.
The time for this event for boys in secondary school is known to possess a normal distribution with a mean of 460 seconds and a standard deviation of 50 seconds. Between what times do we expect approximately 95 of the boys to run the mile?
A) between 362 and 558 seconds B) between 0 and 542.28 seconds
C) between 365 and 555 seconds D) between 377.75 and 542.28 seconds
Q. 5A certain HMO is attempting to show the benefits of managed care to an insurance company. The HMO believes that certain types of doctors are more cost-effective than others.
One theory is that certification level is an important factor in measuring the cost-effectiveness of physicians. To investigate this, the HMO obtained independent random samples of 27 physicians from each of the three certification levelsBoard certified (C); Uncertified, board eligible (E); and Uncertified, board ineligible (I) and recorded the total per member per month charges for each (a total of 81 physicians). How many factors are present in this study?
A) 81 B) 1 C) 3 D) 27
Q. 6The rejection region for a two-tailed test with = .05 is -1.96 < z < 1.96.
A) True B) False
Q. 7A rejection region is established in each tail of the sampling distribution for a two-tailed test.
A) True B) False
Q. 8The rejection region refers to the values of the test statistic for which we will reject the alternative hypothesis.
A) True B) False
Quick Reply
