Refrigerator manufacturers design their freezer units to maintain temperatures within a certain range. Suppose a major refrigerator manufacturer wants the temperature of a particular model to have a standard deviation equal to 9"F_ The company tested the freezer under normal operation conditions, The table to the right shows the freezer temperature readings in degrees Fahrenheit Use these -70 4.3 readings to complete parts a and b. 1.3 63 34 -5.1 -6.6 6.6 75 -2.6 -1.0 -19 -23 -4.4 a. Using a = 0.10, test to determine if the company has achieved its goal. Identify the null and alternative hypotheses. (Type integers or decimals.) Calculate the appropriate test statistic. The test statistic is (Round to two decimal places as needed.) Determine the appropriate critical value(s). The critical value(s) is(are) (Round to three decimal places as needed. Use a comma to separate answers as needed.) State your conclusion