Hypothesis test
It is often useful for companies to know who their customers areand how they became customers. In a study of credit card use,random samples were drawn of cardholders who applied for the creditcard and credit card holders who were contacted by telemarketers orby mail. The total purchases made by each last month were recorded.Can we conclude from these data that differences exist on averagebetween the two types of customers? Test the claim at alpha= 0.05The following table contains means and standard deviations for bothsamples. Assume unequal population variances.
employe sample mean standard deviation sample size
customers who
applied $130.93 $31.99 35
Customers
contacted $126.14 $26.00 30
HINT: use test statistic  Â
