Refer to Exercise 8.44. Recall that an Environmental Science & Technology study was conducted to compare the

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Refer to Exercise 8.44. Recall that an Environmental Science & Technology study was conducted to compare the mean oxon/thion ratios at a California orchard under two weather conditions—foggy and clear/cloudy. The data are saved in the ORCHARD file. Test the assumption of equal variances required for the comparison of means to be valid. Use α = .05.


Data from Exercise 8.44

Environmental Science & Technology (Oct. 1993) reported on a study of insecticides used on dormant orchards in the San Joaquin Valley, California. Ambient air samples were collected and analyzed daily at an orchard site during the most intensive period  of spraying. The thion and oxon levels (in ng/m3) in the air samples are recorded in the table, as well as the oxon/thion ratios.

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Statistics For Engineering And The Sciences

ISBN: 9781498728850

6th Edition

Authors: William M. Mendenhall, Terry L. Sincich

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