chapter 8 final quiz

A ________ for the mean is an interval estimate around a sample mean that provides us with a range of where the true population mean lies.

confidence interval

A ________ is a single value that best describes the population of interest.

point estimate

When calculating a confidence interval for the mean using a sample size of less than 30 with an unknown population standard deviation, the ________ is used.

students t-distribution

A 99% confidence interval has a greater chance of "catching" the true population mean when compared to a 90% confidence interval.

true

The point estimate may not equal the true population mean because of the presence of sampling error.

true

The variation in sample means is measured by the standard error of the mean.

true

When substituting the sample standard deviation for the population standard deviation, we can no longer rely on the normal distribution to provide the critical z-score for the confidence interval.

true

The margin of error can be reduced by reducing the size of the sample.

false

Which one of the following statements is not true regarding the characteristics of the Student's t-distribution?

The shape of the Student's t-distribution is narrower than the shape of the normal distribution.

When calculating a confidence interval for proportions, we assume that proportion data follow the ________________________.

binomial distribution