The Cranston Hardware Company is interested in estimating the difference in the mean purchase for men customers versus women customers. It wishes to estimate this difference using a 95 percent confidence level. Assume that the variances are equal and the populations normally distributed. The following data represent independent samples from each population: 
Based on these data, the upper limit of the interval estimate is approximately $13.82.
Definitions:
Hardy-Weinberg Principle
A fundamental principle in genetics that explains how genetic variation remains constant from one generation to the next in an idealized population.
Frequency Dependent Selection
A form of natural selection where the fitness of a phenotype depends on its frequency relative to other phenotypes in the population.
Sickle Cell Anemia
A genetic blood disorder caused by an abnormality in the hemoglobin protein, leading to misshapen red blood cells that can cause blockages and complications.
Founder Effect
A genetic phenomenon that occurs when a new population is established by a very small number of individuals, leading to a reduction in genetic variation.
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