1. Can one conclude at the 0.05 significance level that the mileage per gallon achieved in Problem 17.26 is better with the additive than without it? 2. A weight-loss club advertises that a special...

1. Can one conclude at the 0.05 significance level that the mileage per gallon achieved in Problem 17.26 is better with the additive than without it?

2. A weight-loss club advertises that a special program that it has designed will produce a weight loss of at least 6% in 1 month if followed precisely. To test the club’s claim, 36 adults undertake the program. Of these,

25 realize the desired loss, 6 gain weight, and the rest remain essentially unchanged. Determine at the 0.05 significance level whether the program is effective.

3. A training manager claims that by giving a special course to company sales personnel, the company’s annual sales will increase. To test this claim, the course is given to 24 people. Of these 24, the sales of 16 increase, those of 6 decrease, and those of 2 remain unchanged. Test at the 0.05 significance level the hypothesis that the course increased the company’s sales.