Multiple Choice

1.A random sample of 25 observations is selected from a normally distributed population. The sample variance is 10. In the 95% confidence interval for the population variance, the upper limit will be: a. 19.353; b. 6.097; c. 17.110; d. 17.331

2.A survey was mailed to a total of 400 students; 100 were randomly selected from each of the freshman, sophomore, junior and senior classes last semester. What sampling method was used? a. Cluster sample; b. Stratified sample; c. Systematic sample; d. Simple random sample

3.In which of the following situations would a researcher prefer NOT to use a census? a. database exists; b. small population; c. a census is legally required; d. small sample size required

4.Which of these is not an acceptable type of survey question: a. Fill in the blank; b. Open ended; c. Prejudicial or biased questions; d. Closed ended

5.Which of the following is NOT a potential source of survey error? a. Nonresponse bias; b. Sampling error; c. Systematic error; d. Selection bias

6.Which of the following statements is consistent with the Central Limit Theorem? a. When we know s, the variation in the sample means will be equal to that of the population; b. When µ and s are known, the population will be approximately normally distributed; c. Means of samples of n=30 from an exponential distribution will be approximately normally distributed; d. If a population has µ and s, a sample from that population will be normally distributed if the sample size is large enough.

7.What is the difference between probability sampling and simple random sampling? a. In probability sampling each item has an identical chance of being chosen; b. There is no difference; c. Probability sampling is a type of simple random sample; d. Simple random sampling is a type of probability sampling.

8.The collection and summarization of the socioeconomic and physical characteristics of the employees of a particular firm is an example of: a. a statistic; b. inferential statistics; c. descriptive statistics; d. a parameter

9.Which of the following is NOT a basic step in conducting a survey? a. Develop a budget; b. Create a research design; c. State the goals; d. Secure financing for the survey

10.Which of these is NOT an acceptable type of survey question? a. Prejudicial or biased questions; b. Fill in the blank; c. Closed ended; d. Open ended

11.Name the item that is NOT a recognized survey guideline. a. quality control; b. ability to find friendly survey respondents; c. design; d. pilot or beta test

12.Trudy Jones recently completed her certification examination and learned that her z-score was –2.5. The examining board also informed her that a failure to pass would be all scores that were 1 or more standard deviations below the mean and that those with scores higher than 2 standard deviations above the mean would receive a special commendation award. Trudy can, therefore, conclude that she: a. passed the exam, but no commendation award is forthcoming; b. needs more data to determine if she passed the exam; c. failed the exam; d. passed the exam and will receive a special commendation award

13.What does it mean to have 95% confidence in an interval estimate? a. In repeated sampling, 95% of the point estimates fall within the given interval; b. In repeated sampling, 95% of the intervals would contain the population parameter; c. In repeated sampling, the population parameter would fall in the given interval 95% of the time; d. In repeated sampling, 95% of the population observations fall within the given interval

14.The collection and summarization of the socioeconomic and physical characteristics of the employees of a particular firm is an example of a. descriptive statistics; b. a statistics; c. a parameter; d. inferential statistics

15.Which of the following is not a reason one should have knowledge of statistics? a. To make future projections of one’s sales; b. To increase the amount of information available for use; c. To be able to mount an effective effort to change a government regulation that negatively affects one’s business; d. To help interpret existing information

16.If terms such as positive, negative, more than, and less than, are used, then these hypothesis are: a. alternative hypotheses; b. directional hypotheses; c. nondirectional hypotheses; d. null hypotheses

17.The manipulation of the independent variable is known as the ________. a. validity; b. treatment; c. experimental test; d. randomization