Question

1. In attempting to estimate the amount of money which members of a target market segment spend yearly on toothpaste, a researcher wants to use a Z-value of 1.96 and an error of $0.50. If past research studies have found that the standard deviation for this type of study on this target market segment has been approximately $2.34, approximately what sample size should the researcher use in this study?

Select one:

a. 64

b. 123

c. 85

d. None of the above

2.

When determining sample size, the heterogeneity of the population is estimated with:

Select one:

a. the confidence interval.

b. the confidence level.

c. level of statistical significance

d. the standard deviation of the sample

3.

When the Z-value is 1.96 and p = .40, the sample size needed so that the error will be plus or minus 3 percent will be approximately:

Select one:

a. 936.

b. 812.

c. The data is not sufficient enough to determine the correct answer.

d. 1,025.

Which of the following is NOT a measure of central tendency?

Select one:

a. Mode

b. Median

c. Mean

d. Range

Answer 1

1) Margin of error = 0.5

Option - C is correct

2) Option - a) the confidence interval.

3) Margin of error = 0.03

Option - d is correct

4) Option - d) Range