Exam 12: Sample Size Determination

A ____________ normal distribution is a normal distribution with a mean of zero and a standard deviation of one.

Which of the following are not required to determine sample size using the sample means formula?

A continuous distribution, which is bell-shaped and symmetric about the mean, is known as:

All of the statistical methods for determining sample size in this chapter assume which of the following?

A researcher is conferring with a client to do a telephone interview for a particular topic, which the researcher will subcontract to a field services firm for $10 per usable response. The researcher's client wants to be 95.44% confident of the results. Assume the sample proportions formula is appropriate, and that the level of tolerable sample error is 4%. The budget for data collection only offered by the client can be up to but not over $10,000. How many usable responses are needed for the given level of confidence and much will the subcontractor charge the market researcher for sampling? Is the budget for data collection large enough?

The standard deviation of a distribution of sample means is called the standard error of the mean.

The normal distribution is bell shaped and has only one mode.

Theoretically, the sampling distribution of the mean is always normally distributed.

Compute the required sample size given the required confidence in the sample results is 90%. The level of tolerable sampling error is 1% and the estimated population standard deviation is 5.

Holding constant at a 95% level of confidence, if the standard deviation increases, then the sample size required to represent the population in question will be _______.

Assuming the research objectives of the study can be accomplished, researchers would much prefer to estimate the required sample size using the sample proportion formula rather than the sample means formula. Why?

Statistical power is the probability of making a type II error.

Which of the following is not a piece of required information in order to determine sample size?

Which of the following basic rules can help you calculate how many phone numbers are needed for a project?

Some normal distributions cannot be transformed into standard normal distributions.

In a normal distribution, the mean, median, and mode are equal.

Which of the following is not a method for estimating the population standard deviation?

If it is important to analyze four subgroups of a total sample: married women over 35, single women over 35, married women under 35, and single women under 35 and each group is expected to make up about 25 percent of the total sample, a sample of 400 will only have 100 in each subgroup, what is the problem with the smaller sample size?

When a research company routinely uses samples of 300 for their studies, they are using which type of plan to determine sample size?

The level of tolerable error (e) in the sample proportions formula is expressed in terms of a percent.