A local retail business wishes to determine if there is adifference in the mean preferred indoor temperature between men andwomen. Assume that the population standard deviations of preferredtemperatures are equal between men and women. Two independentrandom samples are collected. Sample statistics of preferredtemperatures are reported in the table below.
Sample size Mean (in Celsius) Standard deviation
Men (Group 1) 25 22.5 1.2
Women (Group 2) 22 Â Â 20.1 1.4
In testing whether two population means are different, the valueof test statistic is .
