The first sample from an independent-measures study has n = 9 with a variance of s2 = 35. The second sample has n = 3 and s2 = 40. What is the df value for the t statistic?

A researcher used a sample of n = 60 individuals to determine whether there are any preferences among four brands of pizza.  Each individual tastes all four brands and selects his/her favorite.  If the data are evaluated with a chi-square test for goodness of fit using a = .05, then how large does the chi-square statistic need to be to reject the null hypothesis?

Carter’s z-score on his math test was -4. The mean score for the math test was 68 with a standard deviation of 5. What was Carter’s raw score?

A repeated-measures experiment and a matched-subjects experiment both produce t statistics with df = 20. Which experiment used more participants?

Active transport  

In a related-samples t-test, what concept does the denominator of the t-ratio measure?

Autocrine & paracrine regulators:

A two-factor experiment with 3 levels of factor A and 5 levels of factor B would consist of ____ separate treatment conditions and the dfbetween groups would be ____.

Neurotransmitters  

A researcher conducts an experiment comparing three treatment conditions with 10 scores in each treatment condition. If a one-way ANOVA is used, how many subjects are needed for the experiment?