Answer Happy

QUESTION 1. [10 marks] A popular pizza chain in Toronto would like to investigate the impact of the promotional offer “buy two medium pizzas, get the third one free” on the weekly sales. The chain selects a random sample of 5 stores and records a week's sale ($000) with and without the promotion. a Store # With Promotion Without Promotion 1 18 12 16 8 2 3 15 15 4 14 13 5 25 22 (a) What is the assumption of this test of hypothesis? (b) Use the critical value method with a=0.05 to test whether there is significant difference between the average weekly sale of the pizza chain with and without promotion. Include all the necessary steps of hypotheses. (c) Construct and interpret 98% confidence interval of the difference between the weekly sale of the pizza chain with and without promotion.