Use the information below to answer all questions: It was reported that last year the average price of a gallon gasoline in a city X was $3.15. This Tim year a sample of 50 gas station had an average price of $3.10 for a gallon. We assume that the population standard deviation of prices is $0.15. We are interested in determining OM whether this year mean price is less than last year. Perform a hypothesis test at the level of significance a=0.05. D Question 1 1 pts The assumptions are satisfied: It is a simple random sample The sample size is so it is more than required number 30. D Question 2 1 pts State null hypothesis Ho: M [ Select ] [ Select ] State alternative hypothesis H1: u [ Select ] [ Select ] D Question 3 1 pts This is [ Select ] D Question 4 1 pts Compute the test statistic. Round to the nearest hundredth. D Question 5 1 pts Find the critical value(s). Round it to the nearest thousandths. If there are two critical values, please use + in front (you can copy it from here). Otherwise use + or - appropriately. Please do not insert any spaces. D Question 6 1 pts Based on the test statistic and critical value(s) we [ Select ] D Question 7 1 pts We conclude that a) There is enough evidence to reject the claim that the mean price of gasoline this year is less than last year. b) There is enough evidence to support the claim that he mean price of gasoline this year is less than last year. c) There is not enough evidence to reject the claim that the mean price of gasoline this year is less than last year. d) There is not enough evidence to support the claim that he mean price of gasoline this year is less than last year. Ob