# solution

A survey question for a sample of 150 individuals yielded 80 Yes responses, 50 No responses, and 20 No Opinions.

. What is the point estimate of the proportion in the population who respond Yes?
What is the point estimate of the proportion in the population who respond No?

The National Football League (NFL) polls fans to develop a rating for each football game (NFL website, October 24, 2012). Each game is rated on a scale from O (forgettable) to 100 (memorable). The fan ratings for a random sample of 6 games follow.
57 61 86 74 72 73.
Develop a point estimate of mean fan rating for the population of NFL games.
Develop a point estimate of the standard deviation for the population of NFL games.

The average score of an online test is 502, and the standard deviation is 100.
What is the probability a sample of 90 test takers will provide a sample mean test score within 10 points of the population mean of 502 (i.e., between 492 and 512) ?
Suppose we have already know that P (z<=-0.1) = 0.4602 and P (z<=0.1) = 0.5398, for z is the random variable from a standard normal distribution.
Hint: You can transfer the normal distribution to the standard normal distribution to solve this problem.

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