Exam 8: Hypothesis Testing: Inferences About a Single Mean

In hypothesis-testing,the size of the portion of the tails of the sampling distribution that fall outside your critical values (i.e.,your "rejection regions")is determined by your _____.

Rejection regions are determined with reference to a probability value known as a(n):

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.The students who took the Kaplan course obtain a mean of 520 on the math SAT.Compute the one-sample z test statistic.

As part of the process of hypothesis testing,the task of a researcher is to choose between _____.

For an alpha level of .05,an unexpected result in the one sample z test includes any sample mean occurring more than _____ standard errors below or more than _____ standard errors above the value of ì represented in the null hypothesis.

A statistical analysis that produces a "statistically significant" result may or may not have important practical applications.

The value of the alpha level has no effect on the power of a statistical test.

A researcher performs a hypothesis test and rejects the null hypothesis.If,in reality,the null hypothesis should not have been rejected,then the researcher has made a

When a result of a statistical test is found to fall within the range of the critical values,the statistical conclusion is to ____________________.the null hypothesis.

The t distribution is similar to the normal distribution in that it is bell shaped,unimodal,and symmetrical.

The values that define the boundaries of the _____ are called the _____.

The one-sample t test is based on the assumption that:

The probability,given a true null hypothesis,of not making a Type I error--that is,of failing to reject a false null hypothesis--is defined by:

The probability of making a _____ error is traditionally called beta.

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

In hypothesis testing,which of the following is assumed to be true?

If N = 30,the sample mean is 12,and the estimated standard error of the mean is 2,what are the 95% confidence intervals?

When researcher states that an observed value will be higher or lower than a comparison value,she must provide a ____________________.alternative hypothesis.

If the null hypothesis is rejected,the results of a statistical test are said to be statistically and practically significant.

In the case of a directional test,the alpha level focuses on only one tail of the distribution,and thus is called a ____________________.