7. A DJ is shopping for cloud storage for his music collection. He finds an online data storage cloud with the following monthly charges per GB (or fraction
thereof): $0.29/GB for 0 < x ≤ 25 GB, $0.26/GB for 25 < x ≤ 50 GB, $0.23/GB for
50 < x ≤ 75 GB, and $0.20/GB for x > 75 GB. What is the difference in price for
storing just the 75 GB and for storing 75 GB plus a new music collection that is
1 GB or less?

Atest of sobriety involves measuring the subject's motor skills. a sample of 31 randomly selected sober subjects take the test and produce a mean score of 64.4 with a standard deviation of 2. a claim is made that the true mean score for all sober subjects is equal to 65. for each part below, enter only a numeric value in the answer box. for example, do not type "z =" or "t =" before your answers. round each of your answers to 3 places after the decimal point. (a) calculate the value of the test statistic used in this test. test statistic's value = (b) use your calculator to find the p-value of this test. p-value = (c) use your calculator to find the critical value(s) used to test this claim at the 0.2 significance level. if there are two critical values, then list them both with a comma between them. critical value(s) =