Chapter 14 MC

____________ is a range of values within which the true population value is estimated to fall. a. Interval estimate b. Point estimate c. Population estimate d. Sample estimate e. Universe estimate

a. Interval estimate

Higher levels of confidence generally require: a. larger sample sizes. b. greater variance. c. smaller sample sizes. d. smaller standard deviation.

a. larger sample sizes.

As the level of tolerable error increases in the sample means formula, the sample size required to represent a particular population is: a. smaller b. larger c. about the same

a. smaller

A continuous distribution, which is bell-shaped and symmetric about the mean, is known as: a. the normal distribution. b. the chi-square distribution. c. the F-distribution. d. the mean distribution. e. the binomial distribution.

a. the normal distribution.

Which of the following is not required to determine sample size using the sample means formula? a. the standard error of the mean b. desired level of confidence c. estimate of population standard deviation d. level of tolerable error

a. the standard error of the mean

Which of the following is not a measure of central tendency? a. variance b. mean c. median d. mode

a. variance

A(n) ____________ normal distribution is a normal distribution with a mean of zero and a standard deviation of one. a. Balanced b. Standard c. Stock d. Ordinary e. Outstanding

b. Standard

Statistical power is the probability of not making which of the following types of error? a. Type I b. Type II c. Type III d. Type A e. Type B

b. Type II

The idea that a large number of sample means or proportions will approximate a normal distribution, regardless of the distribution of the population from which they were drawn, is known as: a. sample variance a. population variance b. central limit theorem c. random error d. simple random sample

b. central limit theorem

Which of the following is not a piece of required information in order to determine sample size? a. estimated population standard deviation b. estimated population median c. acceptable level of sampling error d. desired level of confidence

b. estimated population median

A researcher wants to know the average number of times per month respondents eat at fast food restaurants. The statistic that s/he is most interested in would be the_________. a. variance b. mean c. standard deviation e. proportion

b. mean

A type I error is described as which of the following? a. the error of saying that there is no difference when there is a difference b. the error of saying that there is a difference when there is not a difference c. the error of saying that two variables are the same d. the error of incorrect standard deviation

b. the error of saying that there is a difference when there is not a difference

The _____________ includes all the possible individuals or objects from whom or about which information is needed to meet the objectives of the research. a. Group b. Selection c. Population d. Range e. Variance

c. Population

Which of the following would increase the necessary sample size in a study? a. smaller mean of the variables in question b. less need for precision c. need to divide sample into sub-groups d. larger population e. smaller population

c. need to divide sample into sub-groups

When a researcher is not sure if people who responded to the survey are different from those who did not respond, this brings into question the issue of: a. inappropriate sample size. b. systematic bias. c. nonresponse bias. d. refusal bias.

c. nonresponse bias.

When a research company routinely uses samples of 300 for their studies, they are using which type of plan to determine sample size? a. the 50% rule b. budget available c. rule of thumb d. number of subgroups to be analyzed

c. rule of thumb

All of the statistical methods for determining sample size in this chapter assume which of the following? a. a large population b. a valid questionnaire c. simple random sampling d. stratified sampling

c. simple random sampling

Standard error of the mean is: a. a measure of dispersion of a large population. b. a measure of dispersion of large sample. c. the standard deviation of a distribution of sample means. d. the error in the computation of population standard deviation.

c. the standard deviation of a distribution of sample means.

If we were making inferences from a single sample, we would expect that there would be a ____ percent probability that the sample mean or proportion generated from our sample results would be within two standard errors of the true population mean. a. 68.26% b. 99.74% c. 97.5% d. 95.44% e. 98.00%

d. 95.44%

Which of the following statements about sample size is false? a. There is no direct relationship between population size and the size of the sample required to estimate population parameters. b. The larger the sample variance, the larger the sample size that is required. c. The higher the level of confidence, the larger the sample size that is required. d. The larger the population, the larger the sample size that is required.

d. The larger the population, the larger the sample size that is required.

Which of the following is not a determinant of sample size for probability samples? a. budget available b. research objectives c. rule of thumb d. all of these are determinants

d. all of these are determinants

The results of a sample can be used to generate which of the following concerning the population mean? a. point estimate b. interval estimate c. dot estimate d. point and interval estimate e. interval and dot estimate

d. point and interval estimate

About 68% of the area under a standard normal curve covers one _________. a. mean b. sample c. variance d. standard deviation e. median

d. standard deviation

Which of the following is not a method for estimating the population standard deviation? a. prior study results b. conduct a pilot study c. use secondary data d. using population size

d. using population size

1. How many respondents should be in each important subgroup of a sample? a. 10 b. 25 c. 50 d. 95 e. 100

e. 100

___________ sampling error is the amount of sampling error the researcher is willing to accept. a. Given b. Projected c. Accepted d. Allowable e. Tolerable

e. Tolerable