Courses at the national campus Fall 2001 had an overall grade point average of 2.46
Thirteen accounting, business, and economics courses at the national campus Fall 2001 had a grade point average of 1.81 with a standard deviation of 0.52. At an alpha of 0.05, is the business courses grade point average statistically significantly different than the overall grade point average at the national campus Fall 2001? Use a two-tailed test.
Statistic or Parameter | Symbol | Equations | Excel |
---|---|---|---|
Hypothesis Testing | |||
Calculate a t-statistic (tstat) | t | ||
Calculate t-critical for a two-tailed test | t_{c} | =TINV(a,df) | |
Calculate t-critical for a one-tailed test | t_{c} | =TINV(2*a,df) | |
Calculate a p-value from a t-statistic | p | = TDIST(ABS(tstat),df,#tails) |