1. When the selection of one element from the population influences the selection of another element, the sample:
a. is from a finite population.
b. was selected using computer-generated random numbers.
c. contains selection bias.
d. is a simple random sample.
2. The number of simple random samples of size 20 that can be selected from a finite population of size 25 is:
a. 120
b. 1
c. 53,130
d. 20
3. Suppose the salaries of university professors are approximately normally distributed with a mean of $65,000 and a standard deviation of $7,000. If a random sample of size 25 is taken and the mean is calculated, what is the probability that the mean value will be between $62,500 and $64,000?
a. 0.2005
b. 0.0371
c. 0.0827
d. 0.1465
4. Suppose candidate A for a town council seat receives 43% of the votes in an election. As voters leave the polls they are asked who they voted for. What is the probability that less than 40% of the 80 voters surveyed indicate they voted for candidate A? Assume an infinite population.
a. .2939
b. .8632
c. .7061
d. .1368
5. For which of the following sampling methods can the sampling distribution of the sample statistics generally be identified?
a. All of these choices are correct.
b. cluster sampling
c. simple random sampling
d. systematic sampling