The population is the five employees in a physician’s office, statistics homework help

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