In a Time/CNN telephone poll of 1012 adult Americans, 11% of the respondents said that Ronald Regan was a great president. Give a 98% confidence interval for the proportion of all adult Americans who think that Regan was a great president.

How many kilometers are equal to 5 miles? use 1 mile ≈ 1.61 kilometers. !

Recall that the owner of a local health food store recently started a new ad campaign to attract more business and wants to know if average daily sales have increased. historically average daily sales were approximately $2,700. the upper bound of the 95% range of likely sample means for this one-sided test is approximately $2,843.44. if the owner took a random sample of forty-five days and found that daily average sales were now $2,984, what can she conclude at the 95% confidence level?

Two cars which are 40 miles apart start moving simultaneously in the same direction with constant speeds. if the speed of the car which is behind is 56 mph and the speed of the other car is 48 mph, how many hours will it take for the car which is behind to catch up the car ahead of it?