Exam 8: Testing Means: One-Sample T Test With Confidence Intervals

Following the steps to hypothesis testing allows researchers to make decisions about parameters in a sample using statistics measured in a population.

A researcher obtains z = 2.04 for a one-sample z test.What is the decision for this test at a .05 level of significance?

Increasing sample size will

A researcher tests a hypothesis to prove whether or not his or her hypothesis is correct.

Suppose a researcher wants to make sure that the probability of committing a Type I error is less than 5%.How can the researcher control for this?

If the value of the test statistic is in the rejection region,then

A researcher obtains z = -6.45.What is the decision for a one-tailed test,upper-tail critical,at a .05 level of significance?

The criteria for a decision regarding the value stated in a null hypothesis is set by the

The z statistic is a z transformation for a distribution of sample means.

A researcher reports that the size of an effect in some population is d = 0.88.Which of the following is an appropriate interpretation for d?

Rejecting a true null hypothesis is a Type I error.

The alpha level must be split into each tail for a directional hypothesis test.

A professor gives an exam in which the mean score is 78 points.She gives another exam to test whether or not scores change.In this example,the null hypothesis is

As the population standard deviation increases,the power to detect an effect increases.

Researchers state a level of significance in terms of an alpha level.The alpha level indicates

Which of the following statements regarding the null hypothesis is true?

A researcher believes that increasing attention given to children will improve mean academic performance.Therefore,the alternative hypothesis should be:

A professor finds that the average SAT score among all students attending his college is 1150±150 ( ).He polls his class of 25 students and finds that the average SAT score is 1200.Suppose he computes a one-sample z test at a .05 level of significance.What is his decision?

If a researcher obtains a null finding,then what is the decision?

A null finding is one in which the null hypothesis is incorrectly rejected.