One pilot study estimated wheat price in July and in September using independent samples of wheat producers in the two months. Let X be the wheat price in September and Y the wheat price in July. Let e denote the true population mean wheat price in September and Hy the true population mean wheat price in July. Assume that the population variances of wheat prices in September and July are same. Consider the following statistics: Month Sample Size Sample Mean September July 36 26 $4.00 $3.80 Sample SD $0.20 $0.30 Obtain the 95% confidence interval for the mean wheat price in September. Obtain the 90% confidence interval for the difference between the mean wheat prices in September and July.

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