Cigarette Smoking A researcher found that a cigarette smoker smokes on average 30 cigarettes a day. She feels that this average is too low. She selected a random sample of 11 smokers and found that the mean number of cigarettes they smoked per day was 31. The sample standard deviation was 2.5. At a= 0.05, is there enough evidence to support her claim? Assume that the population is approximately normally distributed. Use the critical value method and tables. (a) State the hypotheses and identify the claim. HOD Hl: E] (Choose one) V onetailed two-tailed This hypothesis test is a (b) Find the critical value(s). Round the answer to three decimal places. If there is more than one critical value, seperate them with commas. Critical value(s): E] (c) Compute the test value. Always round 2' score values to three decimal places. i=8 Part 4 of 5 (d) Make the decision. (Choose one) the null hypothesis. Reject X Do not reject(e) Summarize the results. (Choose one) V hat the mean number of cigarettes smoked per day is greater than enough evidence to support the claim not enough evidence to support the claim enough evidence to reject the claim not enough evidence to reject the claim There is 30