Home Chapter 8 Quiz

# Quiz

This activity contains 15 questions.

## Which of the following is not a property of point estimates?

 unbiasedness efficiency accuracy consistency

## Determine the critical value of t for and .

 2.064 2.485 2.059 1.708

## Give the lower and upper critical values of for a 90% confidence interval and .

 15.659; 33.196 14.848; 32.007 13.848; 36.415 13.091; 35.172

## An interval that includes a certain proportion of measurements with a stated confidence is called a:

 population interval. tolerance interval. sample interval. confidence interval.

## The effect of the sample size on the usefulness of the estimator refers to __________.

 unbiasedness consistency efficiency accuracy

## A chi square distribution is a skewed distribution and its shape depends on its __________.

 sample size confidence interval symmetry degrees of freedom

## With a sample size of 120 or more, s closely approximates precisely so that there is little difference between the __________ and __________ distributions.

 F; t; t; Z ; Z

## The t distribution assumes that the random variable X being studied has a:

 skewed distribution asymmetric distribution squared distribution normal distribution

 Z X p

## Find the Z values corresponding to a 99% confidence level.

 ±1.96 ±2.33 ±1.65 ±2.58

## Determine the critical t value for a 98% confidence level and 15 degrees of freedom.

 2.977 2.602 2.947 2.624