In a study examining the permanence of academic learning, Bahrick and Hall (1991) tested knowledge of high school algebra for two groups of participants 50 years after they graduated from high school. One group had received additional college math courses and the other group had received no advanced math courses in college. The following table shows data similar to Bahrick and Halls results. Do the data indicate a significant difference between the two groups? Use a two- tailed test with α = .05. Report and interpret r2.       No College Math            Additional Math n = 4                                    n = 8 M = 42                                M = 50 s2 = 33.333                         s2 = 20

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Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.