Part I. T/F & Multiple Choice Questions

Questions 1- 5 Answer True or False.

1. The field of statisticscan be roughly subdivided into two areas: descriptive statisticsand probability. ______

2. A company employs 950 individuals. To ascertain how the employees feel regarding a pension plan, 105 of the employees were surveyed. The proportion of the 105 employees who favor the pension plan is a parameter. ________

3. Eye color would be an example of qualitative data. ______

4. A population is typically a very large collection of individuals or objects about which we desire information. _______

5. A qualitative variable that categorizes or describes or names an element of a population is referred to as a nominal variable. _______

6. Consider the following data: the height in centimeters of children in a fourth-grade class. Which of the following best describes these data?

A) Attribute data B) Qualitative data C) Quantitative data D) Sample Data

7. A company has developed a new battery, but the average lifetime is unknown. In order to estimate the average, a sample of 150 batteries is tested and the average lifetime of this sample is found to be 250 hours. The 250 hours is the value of a:

A) parameter B) statistic C) population D) variable

8. IQ’s are an example of what level of measurement?

A) nominal B) ordinal C) interval D) ratio

9. A sample that does not represent a population correctly is called

A) random B) clustered C) biased D) unbiased

10. Sampling that subdivides the population into subgroups with like characteristics is called

A) cluster B) random C) stratified D) sequence

Part II Short Answers/Computational Questions

1. Describe the difference between inferential and descriptive statistics

2. In completing a survey, subjects used the following numbers to indicate marital status

I = Single (never married) 2 = Married 3 = Divorced 4 = Widowed

Is this data qualitative or quantitative? Explain

3. Discuss the difference between a variable and a parameter. Include an illustration.

4. Explain the difference between probability and statistics. Include an illustration

5. Label each of the following as an observational or experimental study. For the experimental study state the control group and the treatment group.

a. A researcher finds that children whose parents smoke have more respiratory illness than children whose parents do not smoke have.

b. A teacher divides her class into two groups. One group is taught a lesson on the computer and the other is taught by traditional lecture. The teacher then gives a test to see which group has better grades.

6. Construct a frequency distributionfor the data given below:

26 26 25 17 16 16 14 17 21 16 16

18 17 15 15 19 16 17 22 15 19 17

16 24 16

7. Contrast the nominal scale of measurement to the ordinal scale. In your opinion what type of scale is used in a list of the order of finish in a horse race? What type of scale is used if we had to describe the sex of the jockeys?

8. Describe briefly how an experimental study is conducted. What is the difference between the two types of variables used?

This posting provides solution to several true/false questions on elementary statistics.