Exam 13: Understanding Research Results: Statistical Inference

Dr.Afzal finds that students who work less than 10 hours a week have significantly higher test scores than students who work more than 10 hours a week.In order to determine the magnitude of the effect of work hours on test scores,he should calculate an estimate of the _____.

Arafa has collected data on the relationship between physical attractiveness and judgments of personality characteristics.In order to determine if the results obtained from the sample are representative of the population,Arafa will need to employ _____ statistics.

A researcher asked participants to rate the softness of two well-known brands of tissue paper-Daisy and Flora.Daisy was rated softer than Flora with mean ratings of 5.50 and 3.25 respectively.This difference was statistically significant at the .05 probability level.The null hypothesis for the population suggests that:

A researcher asked participants to rate the quality of two well-known brands of paper bags-Prime and Zenith.Prime was rated higher than Zenith with mean ratings of 5.50 and 3.25 respectively.This difference was statistically significant at the .05 probability level.The research hypothesis for this study suggests that:

If both the independent and dependent variables use nominal scale properties,the most appropriate statistical test would be the _____.

With three independent variables and a single dependent variable,the most appropriate statistical test for analyzing the data would be the _____.

A _____ result is one that has a very low probability of occurring if the population means are equal.

Which significance level would minimize the probability of a Type I error?

A Type I error occurs when one:

When testing the differences between means,the null hypothesis suggests that any observed difference is due to _____.