13 May 1. Suppose a marketing director of a supermarket chain
1. Suppose a marketing director of a supermarket chain would like to estimate the population-mean sales of a new cereal within +/- $25 with 95% confidence. If the population standard deviation is assumed to be $150, what sample size is needed? What would be your sample size if your population is 3000?
2. An agronomist wants to compare the crop yield of three varieties of chickpea seeds. She plants 15 fields, five with each variety. She then measures the crop yield in bushels per acre. The results are presented in the following table: Seed 1 Seed 2 Seed 3 11.1 13.5 15.3 14.6 9.8 19.0 18 19.8 19.6 16.6 14.6 15.7 16.8 16.7 15.2 a) Run a single factor ANOVA in Excel and give the ANOVA table. b) test for the equality of mean crop yields of the three different seeds at 0.01significance level and include your null and alternative hypothesis. c) What is the p-value for this test? Explain the meaning of the p-value.
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