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The sponsors of televisions shows targeted at the market of 5 - 8 year olds want to test the hypothesis that
children watch television at most 20 hours per week. The population of viewing hours per week is known
to be normally distributed with a standard deviation of 6 hours. A market research firm conducted a
random sample of 30 children in this age group. The resulting data follows:
19.5 29.7 17.5 10.4 19.4 18.4
14.6 10.1 12.5 18.2 19.1 30.9
22.2 19.8 11.8 19.0 27.7 25.3
27.4 26.5 16.1 21.7 20.6 32.9
27.0 15.6 17.1 19.2 20.1 17.7
Test the sponsors' hypothesis at a .10 level of significance. Use the critical value approach and do show
the complete steps involved the analysis