numerade 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? a) t ? 1.6991 b) |t| ? 2.0452 c) |z| ? 1.96 d) z ? -1.645 e) z ? 1.645 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. if the observed value of the test statistic is -1.19, what should be the conclusion of the test? a) reject h0 and conclude that the average cost of a hotel room in atlanta is about $69.21. b) fail to reject h0 and conclude that there is not enough evidence to support the claim that the average cost of a hotel room in atlanta is different than $69.21. c) reject h0 and conclude that the average cost of a hotel room in atlanta is not about $69.21. d) do not reject h0 and conclude that the average cost of a hotel room in atlanta is about $69.21. e) fail to reject h0 and conclude that there is not enough evidence to support the claim that the average cost of a hotel room in atlanta is different than $68.43.