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frank gerbel a local insurance representative has hired a part-time assistant to make cold calls on potential customers
the following data are the number of persons who were waiting in line at a checkout counter at 100 randomly selected
a newspaper reporter collecting data for a feature article on her state lottery system has found the 200 digits most
a national public television network has found that 35 of its contributions are for less than 20 with 45 for 20-50 and
twenty-five percent of the employees of a large firm have been with the firm less than 10 years 40 have been with the
the following contingency table describes types of collisions versus driving environments for a random sample of
of the students at a large university 30 are freshmen 25 are sophomores 25 are juniors and 20 are seniors the
three different instructional techniques are being considered for training mechanics to perform a difficult
taking air samples at random times during a 2-month period an environmental group finds the standard deviation of ozone
union members in a large firm work in three departments assembly maintenance and shippingreceiving twenty of a random
an aspirin manufacturer has designed the childproof cap on its bottles so that it must be pressed down before it can be
a campus newspaper is examining the extent to which various segments of the university community favor the student
for three independent samples each with n 100 the respective sample proportions are 030 035 and 025 use the 005 level
a scenic america study of billboards found that 70 of the billboards in a sample observed in baltimore advertised
it has been reported that 183 of all us households were heated by electricity in 1980 compared to 265 in 1993 and 307
in applying the chi-square statistic to estimation and tests for a population variance why must the population be
1 a random sample of 30 observations has been drawn from a normal population and the sample variance is found to be
a random sample of 20 observations has been drawn from a normal population and the sample variance is found to be s2
during the early stages of production for a single-cylinder engine designed for use in portable generators the
an instrument maker has randomly selected and submitted 20 of its electronic blood-pressure measurement units to a
according to industry specifications the standard deviation of gasket thicknesses for a given application must be no
in conducting a chi-square test why is it advisable that each expected frequency be at least 50if the expected
in carrying out a chi-square test for the independence of variables what is the procedure for determining the number of
in a test of the independence of two variables one of the variables has two possible categories and the other has three
a researcher has observed 100 shoppers from three different age groups entering a large discount store and noted the