1. The population is the five employees in a physician’s office.

| September 12, 2019

Question Description

BUSINESS STATISTICS

1. The population is the five employees in a physician’s office. The number of possible samples of 2 that could be selected from this population is

a. 5 b. 10 c. 15 d. 60

2. Suppose we have a negatively skewed population. According to the central limit theorem, the distribution of a sample mean of a particular size will

  • also be negatively skewed.
  • Form a binomial distribution.
  • Approach a normal distribution.
  • Become positively skewed.

3. In a probability sample, each item in the population has

  • a chance of being selected.
  • the same chance of being selected.
  • a 50 percent chance of being selected.
  • no chance of being selected.

4. The sample mean is an example of a

  • sample statistic. c. weighted mean.
  • normal population. d. population parameter.

5. A single number used to estimate a population parameter is

a. the confidence interval. c. the population parameter.

b. a point estimate. d. the mean of the population.

6. The size of the standard error is affected by the standard deviation of the sample and

a. a confidence interval. c. the population parameter.

b. the point estimate. d. the sample size.

7. Suppose we select 100 samples from a population. for each sample we construct a 95 percent confidence interval. We could expect about 95 percent of these confidence intervals to contain

a. a sample mean. c. the population mean.

b. a point estimate. d. the standard deviation of the population

8. The t distribution is a continuous distribution, with many similarities to

a. the confidence interval. c. the population parameter.

b. the standard normal deviation. D. the mean of the population.

9. The t distribution is used when the population is normal, the sample is les than 30, and

  • the population standard deviation is unknown.
  • The population standard deviation is known.
  • The point estimate is known.
  • The mean of the population is unknown.

10. The fraction, ratio, or percent indicating the part of the sample of the population having a particular trait of interest is

a. sample mean. b. sampling error. c. z value. d. population mean.

Statistics Exam 3

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