A credit officer believes that monthly account balances are a different amount now than they were one year ago. The mean ofallaccount balances in the general population last year was $2,200. This year,a sample of 81 account balancesshows an average balance of $2,236 with a sample standard deviation of $135.

Based on the description, what is the appropriate test for this situation? O A. Single sample t test B. Single sample z test O C. Dependent z test O D. Dependent t testWhat are the null and alternative hypotheses? O A. Ho : MD = 2200; Ha : MD # 2200 O B. Ho : MD 2200 O C. HO : MD 2 2200; Ha : MD 2200 OF. Ho : M = 2200; HQ : M # 2200 O G. Ho : M # 2200; Ha : M = 2200 O H. Ho : MD # 2200; Ha : Mp = 2200Click to see additional instructions Using the degrees of freedom you just reported and an alpha of 0.05, what is/are your critical value (to 3 decimals)? If you are performing a two-tailed test, enter in two critical values: the negative critical value in the rst blank, then the positive critical value in the second blank. If you are performing a one-tailed test, enter in only the critical value that is necessary for that tail. If it is a negative critical value, use the first blank. If it is a positive critical value, use the second blank. Leave the other space empty. and Click to see additional instructions What is the value of your test statistic (to 1 decimal)? If the value is negative, be sure to enter in a negative sign (note: you may need to enter the value first, then put your cursor to the left and enter the negative sign). Based on the test statistic and decision rule, we O A. reject the null hypothesis. O B. retain the null hypothesis. What is the correct p-value interval for the test statistic? Use the table that has been provided to determine the answer to this question (in other words, do not use Google to find a probability table that does not match ours and try to derive your answer from that one). t Distribution Table.p 237 KB 2 Distribution Table.@ 271 KB O A. p > 0.40 O B. 0.20