Many people take ginkgo supplements advertised to improve memory. are those over the counter supplements effective? a study was conducted where 104 randomly selected adults were given 40 mg of gingko and 115 randomly selected adults were given a placebo pill. each group consumed the supplement 3 times/day. at the end of six weeks a test was done of short term memory. the average score for those taking the gingko pill was 5.6 with a standard deviation of .6. the average score for those taking the placebo pill was 5.5 with a standard deviation of .6. based on these results, is there evidence that gingko is effective in improving short term memory. conduct this hypothesis test at a .01 significance level. what is the value of the test statistic for this hypothesis test? (round to hundredths place)