Here we investigate whether the register balance at a local retail store is better on days with a manager than days without a manager. This evidence might be used to determine whether or not you should always schedule a manager. The table gives the register balance for a sample of 10 days with a manager and 10 days without a manager. Here, 0 means the register balance is right on, negative means there is less money than there should be, and positive means there is more money than there should be. The degrees of freedom (d.f.) is given in the table. Register Balance (10 days each) With -1 4 -3 -2 0 -3 -1 1 Manager (x2) Manager (1) Without -2 -4 -14 2 -4 -6 -8 -4 -2 1 -4.1 (a) Find the test statistic. 2.226 (b) Find the critical value. 2.878 -2 2 (c) Is there sufficient data to support the claim? Yes No degrees of freedom: d.f. = 13 Test the claim that the average register balance is better (greater) for all days with a manager than those days without a manager. Use a 0.01 significance level. mean -0.5 (d) Test the same claim at the 0.05 significance level. Critical value: 8² 5.16666666666667 2.27303028283098 20.9888888888889 4.58136321294098

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It takes Doug 3 days to reroof a house. If Doug's son helps him, the job can be completed in 2 days. How long would it take Doug's son, working alone, to do the job?

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