What does k signify in dfBG= k-1 for Two-Factor ANOVA?

In an experiment to determine whether seeding clouds with silver iodide increases rainfall, 52 clouds were randomly assigned to be seeded or not. The amount of rain they generated was then measured (in acre-feet). Would we use the first line or the second line of the independent-samples t-test results from SPSS?  

What value is estimated with a confidence interval using the t statistic?

On average, what value is expected for the F-ratio if the null hypothesis is true?

Determining the class standing (1st, 2nd, and so on) for the graduating seniors at a high school would involve measurement on a(n) ____ scale of measurement.

The following table shows the results of an analysis of variance comparing four treatment conditions with a sample of 5 participants in each treatment.  Note that several values are missing in the table.  What is the missing value for the F-ratio?Source         SS        df      MS      Between      30      xx      xx      F = xxWithin           xx       xx      xxTotal              62       xx         

If n = 15 for each sample, which of the following sets of data provides the clearest difference between the two samples?

Last week, Sarah had exams in Math and in Spanish.  On the Math exam, the mean was µ = 30 with σ = 5, and Sarah had a score of X = 45.  On the Spanish exam, the mean was µ = 60 with σ = 8 and Sarah had a score of X = 68.  For which class should Sarah expect the better grade?

What value is estimated with a confidence interval using the t statistic?

If an analysis of variance is used for the following data, what would be the effect of changing the value of SS1 to 50?Sample DataM1 = 10    M2 = 15SS1 = 90    SS2 = 70