While researching the feasibility of converting her company's products to solar energy, hermina reads several reports on innovations to lithium batteries and photovoltaic cells. some of the reports suggest any energy using device should begin to incorporate solar into its design, while others argue that the batteries still do not hold enough charge and remain cost prohibitive for products like those of her company. to demonstrate her own original thinking, hermina should generate her own conclusions and recommendations. chose one source and follow its recommendations exclusively. adopt a methodical approach to decision making. avoid making predictions and cause-effect statements. cite all her research sources.

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) =