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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
an engineer believes it takes an average of 150 man-hours to assemble a portion of an automobile as a check the time to
for a study on self-awareness the observed values for one of the groups
rats are subjected to a drug that might affect aggression suppose that for a random sample of rats measures of
1 suppose m 34 and the mckean-schrader estimate of the standard error of m is sm 3 compute a 95 confidence interval
a cosmetic company found that 180 of 1000 randomly selected women in new york city have seen the companys latest
listed here are the average lsat scores for the 1973 entering classes of 15 american law schools545 555 558 572 575 576
given that xoline 78 sigma2 25 n 10 and alpha 05 test h0 mu gt 80 assuming observations are randomly sampled from
1 for a binomial with n 20 and p 7 determine the mean and variance of pcirc the proportion of observed successes2 for
1 a coin is rigged so that when it is flipped the probability of a head is 7 if the coin is flipped three times which
the department of agriculture of the united states reports that 75 of all people who invest in the futures market lose
imagine you are a health professional interested in the effects of medication on the diastolic blood pressure of adult
many research teams intend to conduct a study regarding the proportion of people who have colon cancerif a random
1 if a distribution appears to be bell-shaped and symmetric about its mean can we assume that the probability of being
1 can small changes in the tails of a distribution result in large changes in the population mean mu relative to
1 if the cholesterol levels of adults are normally distributed with mean 230 and standard deviation 25 what is the