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consider a x2nbsptest of independence that is to be applied to the elements of a 2 x 2 contingency table show that the
suppose that a x2nbsptest of independence at the level of significance 005 is to be applied to the elements of a 2 x 2
in a study of the health effects of air pollution it was found that the amp39 proportion of the total population of
suppose that an achievement test in mathematics was given to students from two different high schools a and b when the
suppose that a random sample of n observations is drawn from a t distribution with a degrees of freedom show that the
suppose that a random sample of 100 observations is taken from a normal distribution for which the mean 8 is unknown
in an experiment to compare two different types of long-lasting razor blades a and b 20 men were asked to shave with a
consider again the conditions of exercise 1 discuss how the design of this experiment might be improved by considering
in an experiment to compare two different materials a and b that might be used for manufacturing the heels of men dress
consider again the data in example i test the hypotheses 1 by applying the kolmogorov-smirnov test for two
test the hypothesis that the 50 values in table 926 form a random sample from a normal distribution for which the mean
find the probability that n observations in the random sample will be smaller than
use the table of random digits given at the end of this book to obtain a sample of 15 independent observations in which
repeat exercise 4 ten times using different random digits each time in other words construct ten independent samples
suppose that five persons shoot at a target suppose also that for i 1 bullbull 5 person i shoots n times and hits the
suppose that 100 students in a physical-education class shoot at a target with a bow and arrow and that 27 students hit
as people entered a certain meeting i persons were selected at random and each was asked either to name one of two
consider two populations i and ii suppose that 80 percent of the men and 30 percent of the women in population 1 have a
suppose that each adult subject in an experiment is given either treatment i or treatment ii prove that the proportion
it was believed that a certain university was discriminating against women in its admissions policy because 30 percent
test the hypothesis that the 25 values in table 925 form a random sample from a uniform distribution on the interval 0
investigate the randomness of the table of random digits given at the end of this book by regarding the 200 digits in
according to a simple genetic principle if both the mother and the father of a child have genotype aa then there is
it is known that 30 percent of small steel rods produced by a standard process will break when subjected to a load of
in a random sample of 1800 observed values from the interval 01 it was found that 391 values were between 0 and 02 that