Exam 8: Hypothesis Testing: Inferences About a Single Mean

If a researcher rejects a null hypothesis that is true,then a _____ has been made.

Based on the Method of Presentation section of Chapter 8,suppose you obtained a statistically significant t value of 2.5 with 15 subjects using an alpha level of .05.How would this be reported in a psychological journal?

Type II errors are made when you _____ H₀ and H₀ is _____.

The terms "statistically significant" and "statistically nonsignificant" are meant to apply:

When the observed value of z falls within the range defined by the critical values,we reject the null hypothesis.

The alpha level directly affects the power of the statistical test,with more _____ alpha levels yielding _____ tests,everything else being equal.

In the Applications to the Analysis of Social Problems section of Chapter 8,the confidence intervals for the mean age at which mothers think parents should talk with children about sex and the confidence intervals for the mean age at which mothers think parents should talk with children about birth control were relatively narrow.What does this mean?

A t value is analogous to a z score except that it represents the number of _____ a sample mean is from ì.

Which of the following is NOT one of the conditions for using the one-sample z test?

A researcher in sports psychology is interested in the resting pulse rate of long-distance college runners.She does some research and finds data from the U.S.Olympics team showing their long-distance runners have a resting pulse rate of 60 beats per minute.She wants to know if the pulse rate for college runners is different from the Olympic team's m of 60.She randomly samples 20 long-distance runners,and finds Based on the above calculations,what is your decision regarding the null hypothesis?

One step in the hypothesis testing process is the conversion of the observed sample mean into a z value to determine how many standard deviations it is away from ì,assuming the alternative hypothesis is true.

The statement "to fail to reject the null hypothesis" would be made when the observed value of z ______.

The power of a statistical test can be increased by _____.

When calculating ,we are calculating the ____________________.number of standard errors that the sample mean is from m.

A t value is analogous to a z score except that it represents the number of estimated standard errors a sample mean is from ì.

Failure to reject the null hypothesis when it is false is called a:

When a researcher knows the population standard deviation,and has a population value to compare a sample value to,the appropriate statistical test is the ____________________.

Type I errors occur when we ______.

To avoid making a Type I error,we should use _____ level.

Rather than just use the word "significant" to describe rejection of the null hypothesis,it is more precise to use the phrase ____________________.to describe a statistical conclusion.