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1 using a computer determine what happens to the correlation between x and y if the y values are multiplied by 32
imagine a study where the correlation between some amount of an experimental drug and liver damage yields a value for r
suppose r2 95a explain why this does not provide convincing evidence that the least squares line provides a good fit
imagine a situation where points are removed for which the x values are judged to be outliersnote that this restricts
1 if the normality assumption is violated what effect might this have when computing confidence intervals as described
suppose that the sample means and variances are xoline1 15 xoline2 12 s21 8 s22 24 with sample sizes n1 20 and n2
for two independent groups of subjects you get xoline1 45 xoline2 36 s21 4 s22 16 with sample sizes n1 20 and n2
two methods for training accountants are to be compared students are randomly assigned to one of the two methods at the
responses to stress are governed by the hypothalamus imagine you have two groups of subjects the first shows signs of
1 the 95 confidence interval for the difference between the means using students t is 22 205 what are the practical
a film producer wants to know which of two versions of a particular scene is more likely to be viewed as disturbing one
a course aimed at improving an understanding of good nutrition is attended by 28 students before the course began
the median of 20 difference scores is found to be md 5 there are no tied values and the mckean-schrader estimate of
it is found that of 121 individuals who take a training program on investing in commodities 20 make money during the
in a study dealing with violence between factions in the middle east one goal was to compare measures of depression for
for 49 pairs of sisters a researcher wanted to know whether the older sisters differ on average from the younger
1 still assuming equal variances test the hypothesis of equal means using students t-test and the data in the last
verify that for the following pairs of points the least squares regression line has a slope of zero plot the points and
1 for the following data compute the least squares regression line for predicting gpa given
1 for the following pairs of points verify that the least square regression line is ycirc 18x -85x 5 8 9 7 14y 3 1 6 7
a standard measure of aggression in 7-year-old children has been found to have a 20 trimmed mean of 48 based on years
in a study of court administration the following times to disposition were determined for twenty cases and found to
1 an antipollution device for cars is claimed to have an average effectiveness of exactly 546 based on a test of 20
1 comment on the relative merits of using a 95 confidence interval for addressing the effectiveness of the
a portion of a study by wechsler 1958 reports that for 100 males taking the wechsler adult intelligent scale wais the