Question

keep up-to-date with security updates, fixes, and improvements, choose Check for Updates. 6. Find the parameters and statistics in the example below. Use correct notations to denote them. 1). 2pts. We saw that an SRS of 400 high school senior gained an average 12 points in their second attempt at the SAT Mathematics exam. Suppose the SAT test scores have a normal distribution with a standard deviation 42. 2). 2pts. A Gallup Poll in November 2013 found that 51 people over 100 in an SRS sample said they want to lose weight. 7. Overall, about 14% of students who take the SAT test are "coached". That is, they are given special help so that they might do better. a. 5pts. Suppose we take a random sample of 300 students and compute the proportion in the sample who are coached. Within what interval will the sample proportion fall 95% of the time? b. 2pts.A random sample of 300 students was taken from a certain affluent school district. There were 75 students in the sample who were coached. Does this show that there is a significantly higher percentage of students who are coached in this district than there is overall? c. 5pts. A random sample of 1200 adults showed that 320 have tried a "natural medicines" to treat common ailments such as a cold. To get support for having the government help pay for natural medicines, an advocate testified before the legislature that he thought that at least 40% of the population has tried natural medicines for common ailments. Does the result of the sample tell us that 40% is possible or that it is improbable? What is the 95% maximum margin of error? d. 3pts. What is the sample size if we want the 95% margin of error is 0.001? Focus vords English (United States)

Answer 1

Question 6:

(a) The parameter is, µ, high school seniors.

The sample is, x, 400 high school seniors

(b) The parameter is, µ, people who want to lose weight.

The sample is, x, 100 people who want to lose weight.

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