Sample size formulas for nonprobability samples

 

1. Which of the following statements is true of sample size formulas for nonprobability samples?

A. The sample size formula must be adjusted for confidence level before it can be used for nonprobability samples.

B. The sample size formula must be adjusted for error tolerance before it can be used for nonprobability samples.

C. The sample size formula must be adjusted for population variance before it can be used for nonprobability samples.

D. The sample size formula must be adjusted for confidence level and error tolerance before it can be used for nonprobability samples.

E. Sample size formulas cannot be used for nonprobability samples.

Response ____.

Defense---------

2. In which stage of the sampling plan will random-digit dialing probably be considered?

A. Selecting the data collection method

B. Defining the target population

C. Selecting the appropriate sampling method

D. Creating an operating plan for selecting sampling units

E. Identifying the sampling frame

Response ____.

Defense

3. If the estimate of expected population proportion having a desired characteristic based on intuition is 60 percent and the acceptable error is plus or minus 5 percent, and the z-value for a 95 percent level of confidence is 1.96, the needed sample size is approximately:

A. 187

B. 368

C. 295

D. 196

E. 950

Response ____.

Defense