1. A researcher wants to look at the effect of time on test scores, believing test scores will change over the semester from the pre-test to the post-test. What are the variables in this specific study? Identify each as an independent or dependent variable. The independent variable and dependent variable is the same in dependent […]

# hypothesis

# Hypothesis Testing example problem

A bus company advertised a mean time of 150 minutes for a trip between two cities. A consumer group had reason to believe that the mean time was more than 150 minutes. A sample of 40 trips showed a mean x̄= 153 minutes and a standard deviation s=7.5 minutes. At the .05 level of significance, […]