Question

1. (1 point). (True / False) Estimating parameters and testing hypotheses are two important aspects of descriptive statistics.

2. (1 point). (True / False) A statistic is calculated from a population and a parameter is calculated from a sample.  

3. (1 point). (True / False) Descriptive statistics include visual display of data, measures of central tendency and dispersion.

(2 points each) What type of data (qualitative, discrete numerical, continuous numerical) is each of the following variables:

4. ______________________ The manufacturer of your laptop computer

5. ______________________ The number of tickets in a movie theater

(2 points each) Which level of data (nominal, ordinal, interval, ratio) is each of the following variables?

6. ______________________ Your social security number

7. ______________________ Temperature in degrees Celsius

8. (3 points). 1,000 names are selected from a phone book containing 50,000 people by choosing every 50^th name. Which sampling method is this?

A) Simple random sample.

B) Systematic sample.

C) Stratified sample.

D) Cluster sample.

9. (3 points). From its 32 regions, the F.A.A. selects 6 regions, and then randomly audits 25 departing commercial flights in each region for compliance with legal fuel and weight requirements. This is an example of

A) simple random sampling.

B) stratified random sampling.

C) cluster sampling.

D) judgment sampling.

10. (3 points). Suppose we want to estimate vaccination rates among employees in state government, and we know that our target population is 55 percent male and 45 percent female. Our budget only allows a sample size of 200. We randomly sample 110 males and 90 females. This is an example of

A) simple random sampling.

B) stratified random sampling.

C) cluster sampling.

D) judgment sampling.

Answer 1