As the Hispanic population in the United States has grown, businesses have tried to understand what Hispanics like. One study interviewed separate random samples of Hispanic and Anglo customers leaving a bank. Customers were classified as Hispanic if they preferred to be interviewed in Spanish or as Anglo if they preferred English. Each customer rated the importance of several aspects of bank service on a 10-point scale. Here are summary results for the importance of “reliability” (the accuracy of account records, etc.):

Researchers want to know if there is a difference in the mean reliability ratings of all Anglo and Hispanic bank customers.

a. State appropriate hypotheses for performing a significance test. Be sure to define the parameters of interest.

b. Check that the conditions for performing the test are met.

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305 := 0.200 = 20.0%- х 1526 Group Sx %3D Anglo 92 6.37 0.60 Hispanic 86 5.91 0.93