Exam 18: Inferential Statistics

Nelson's recent study tested differences in problem-solving ability based upon science ability, treatment (instruction, no instruction), and gender. Of the following, which test should Nelson employ?

Independent samples refer to samples

Which of the following does one need to know to calculate the standard error of the mean?

Given a set of scores with a mean of 25, standard deviation of 4 and a sample size of 50, calculate the standard error of the mean.

Which of the following represents a null hypothesis regarding the differences between two groups learning biology content?

In his study of effectiveness of driver's education programs, Cameron administers a practice items from a drivers' test. Participants are randomly assigned to one of two treatments, either a tutorial that narrates content, or an equivalent amount of time to practice items with feedback. After the treatment, Cameron again assesses students' knowledge with a drivers' test. He set his alpha at p = .05, and reported that significant differences indicated that those in the practice with feedback condition outperformed those in the tutorial condition. Which of the following were appropriate for Cameron to use to analyze his data?

Shani is testing whether her intervention designed to increase self-reported tolerance for others in aggressive youth is effective. She administers her scale before and after the intervention and concludes that her intervention is effective. Which analysis did Shani most likely use?

The t test for nonindependent samples is when

In determining the test of significance to select, one must consider all of the following EXCEPT

Anan conducted an experimental study in which students were randomly assigned to either 10 minutes of read aloud, 10 minutes of silent reading, 10 minutes of writing, or 10 minutes of free time. She concluded that there were significant differences among groups with the read aloud group outperforming others on a standardized reading assessment. However, there were not actual differences among groups. Anan conclusion represents

Parametric tests require all of the following assumptions EXCEPT

The test of significance that determines if two group means differ more than would be expected by chance is the

Given a set of scores with a mean of 80, a standard deviation of 3, and a sample size of 82, calculate the standard error of the mean.

As the population standard deviation increases

Saud examined differences in reading ability between those who were exposed to parent read aloud and those who were exposed to sibling read aloud. To calculate his t test to compare groups, Saud needed to determine his degrees of freedom. To do so he will need to know not only that he has two groups but also he will need to know which of the following pieces of information?

Cristos has collected data to explore differences in opinions about diversity training in the workplace based upon geographic location in the county. The first step he should take in selecting the appropriate test of significance is to

One benefit of conducting a two-tailed test is that

The first decision in selection of an appropriate test of significance is

Garrett wants to see if there are gender differences in the restaurant preferences of high school students in his town. His data is nominal in nature. Which of the following tests is he likely to employ?

Molly has conducted a study that examines whether exposure to computers increases eyestrain in children. She randomly assigns children to one of four treatment conditions dependent upon computer exposure levels. The children's eyestrain is then tested. Which of the following tests of significance is Molly likely to use?