A school committee conducted a survey to determine the amount of time students spent doing homework. The committee asked every fifth student who entered the school about the amount of time he or she spent doing homework. Were the results of the survey valid? A. No, because the committee did not survey a sample that is representative of the population. B. Yes, because the committee surveyed a sample that is representative of the population. C. No, because the committee did not survey everyone at the school. D. Yes, because the committee surveyed all the students.

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) =