Question 7 (Mandatory) (1 point) An old survey claims that the average cost of a hotel room in Atlanta is $69.21. To test if the current cost is different, a researcher selects a sample of 32 hotel rooms and finds that the average cost is $68.43. The standard deviation of the population is $3.72. At 0.05 significance level, what is the null hypothesis (Ho)? OH : 69.21 Ou ' 69.21 OH - 68.43 OH - 69.21 Ous 69.21 Question 8 (Mandatory) (1 point) An old survey claims that the average cost of a hotel room in Atlanta is $69.21. To test if the current cost is different, a researcher selects a sample of 32 hotel rooms and finds that the average cost is $68.43. The standard deviation of the population is $3.72. At 0.05 significance level, what is the rejection region for this test? OZs-1.645 OZ = 1.645 Ots-2.0452 ort 2 2.0452 Otz 1.6991 OZs-1.96 or Z 2 1.96