Chapter 6 & 7 Statistics

the levels of significance most commonly used by staticians are ____ and _____ levels

0.05 and 0.01

The purpose of constructing a confidence interval for the mean is to ____ the true value of the population mean, based upon the mean of a _____

estimate ; sample

if your calculated test statistic does no meed or exceed the critical value, you would ______ the null hypothesis

fail to reject

In an independent samples hypothesis test, the number of cases in each sample must be equal.

false

in the test for the difference of means, independent sample design, the number of cases must be equal

false

Whether constructing a confidence interval for a proportion or a mean, there are two ways to increase the precision of the estimate. You can _ sample size, or you can _ the level of confidence.

increases; decreases

there is a ___ relationship between the level of confidence and the level of precision of the estimate

inverse

the alpha level is also known as the level of

level of significance

A confidence interval for the mean is calculated by adding and subtracting a value to and from the sample

mean

a confidence interval for the mean is an interval within which you believe the ___ of the population is located

mean

in the matched samples design, the sampling distribution at the issue is the sampling distribution of

mean differences

when constructing a confidence interval for a proportion, the margin of error is actually a reflection or statement of the ___ of the interval

width

another name for the region of rejection is the

critical region

As the level of confidence increases, the precision of your estimate

decreases

When our calculated test statistic falls within the ____, we reject the ____

region of rejection of critical region, null hypothesis

Which type of hypothesis test involves comparing two samples that are linked on a case-by-case basis?

related samples t-test

standard deviation unknown, how do you estimate the standard error of the mean?

s divided by the square root of n

A confidence interval for the mean is calculated by adding and subtracting a value to and from the

sample mean

standard error of the mean

standard deviation divided by the square root of n

in the independent samples design, the sampling distribution at issue is the sampling distribution of ____

the differences between means

When constructing a confidence interval for the mean with σ known, the standard error is calculated by dividing ______ by the square root of the sample size.

the population standard deviation

In a related samples hypothesis test, the number of cases in each sample must be equal.

true

in a matched sample design the number of cases in each sample must be equal

true

The level of significance is the probability of making a ___ error

type 1

Rejecting a null hypothesis when it is true represents a ___ error

type 2

Failing to reject a null hypothesis when it is false represents a ___ error

type 3