A bank has collected data on customers and would like to know if the population mean amount of money in a standard checking account is different for customers in one of three groups:

• Group 1 = the customer has a checking account only
• Group 2 = the customer has a checking account and a savings account
• Group 3 = the customer has a checking account and a bank credit card account

1. How many variables are in this problem?

1. 1
2. 2
3. 3
4. 4

2. Write the proper null and alternative hypotheses to answer this research question.

3. We'll assume all required conditions for inference are met. Given the following output:

Df Sum Sq Mean Sq F value Pr(>F) customer 2 2. 168e+08 108381449 6. 112 0. 00281 * * Residuals 150 2.660e+09 17732187 Signif. codes: 0 '***' 0. 001 '* * ' 0. 01 '*' 0.05 '.' 0.1 ''1