What is stated by the null hypothesis for the chi-square test for independence?

A 95% confidence interval for the population mean ranges from 44 to 52. Based on this information:

A repeated-measures analysis of variance for a study comparing three treatment conditions with a sample of 10 participants, produces an F-ratio of F = 5.40.  For this result, which of the following is the correct statistical decision?

For a repeated-measures study comparing two treatments with n = 15 scores in each treatment, the data produce t = 1.78. If the mean difference is in the direction that is predicted by the researcher, then which of the following is the correct decision for a hypothesis test with α = .05?

A researcher is interested in the eating behavior of rats and selects a group of 25 rats to be tested in a research study.  The group of 25 rats is an example of a ____.

After conducting a one-tailed, one-sample t-test you find the critical t value is -2.045 while the t value you obtained for your sample is -3.61. Which of the following decisions could you make?

A researcher conducts an experiment comparing two treatment conditions with 20 scores in each treatment condition. If an independent-measures design is used, how many subjects are needed for the experiment?

A vertical line is drawn through a normal distribution at z = 0.50, and separates the distribution into two sections.  What proportion of the distribution is in the larger section?

For a population with µ = 100 and s = 20, what is the X value corresponding to z = –0.75?

Which of the following locations is most likely to have a population with negatively skewed distribution, where the x-axis is age and the y-axis is frequency?