Exam 8: Hypothesis Testing: Inferences About a Single Mean

A group of 200 students takes the Kaplan course in hopes that it will improve their SAT scores above the national mean of 500 on the math section.The population standard deviation of the SAT is known to be 100.Use an alpha level of .05 when answering the following questions.What is the alternative hypothesis?

The p value reported in APA manuscripts is commonly referred to as _____.

Which of the following statements is an example of a two-tailed alternative hypothesis?

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

A group of 200 students takes the Kaplan course in hopes that it will improve their SAT scores above the national mean of 500 on the math section.The population standard deviation of the SAT is known to be 100.Use an alpha level of .05 when answering the following questions.What conclusions can be made,based on this test statistic?

When a researcher obtains a result that is consistent with the null hypothesis,he or she accepts the null hypothesis as being true.

When N > 40,and the raw scores in the population are normally distributed,then the normal and t distributions are very different from one another.

As a rough guide,investigators generally attempt to achieve statistical power (the probability of correctly rejecting the null hypothesis when it is false.in the range of _____ to _____.

Type I errors occur when we ______.

Why would a researcher want high statistical power rather than low statistical power?

The _____ the sample size,the _____ the statistical test will be,everything else being equal.

The set of all standard scores more extreme than the critical values is called a rejection region and constitutes an unexpected result.

If you conducted an experiment and observed results that indicated a very large discrepancy between the observed and expected results,then you probably would ______.

Statisticians have discovered that the one-sample t test is not robust to violations of the normality assumption under any conditions.

A group of 200 students takes the Kaplan course in hopes that it will improve their SAT scores above the national mean of 500 on the math section.The population standard deviation of the SAT is known to be 100.Use an alpha level of .05 when answering the following questions.What should be the critical value?

Which of the following statements is NOT true?

Informally,the _____ hypothesis can be thought of as the hypothesis of _____.

If an observed z or t score is greater than the critical value,we would reject the null hypothesis.

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 What is the appropriate test statistic for this data?

A confidence claim reflects a _____ of an extended number of confidence intervals across all possible random samples of a given size.