Suppose that a researcher is designing a survey to estimate the proportion of adults in your state who oppose a proposed law that requires all automobile passengers to wear a seat belt.

What would be the approximate margin of error if the researcher randomly sampled 400 adults?

Suppose that a researcher is designing a survey to estimate the proportion of adults in your state who oppose a proposed law that requires all automobile passengers to wear a seat belt.

What sample size would be needed to provide a margin of error of about 2%?

In a political poll, the margin of error is related to the standard error of the published number. A. True B. False C. May be true or false depending on the number of people sampled

Students in a statistics class were asked, "About how many minutes do you typically exercise in a week?" Responses from the women in the class were 60,240,0,360,450, 200,100, 70,240,0,60,360, 180, 300,0,270 Responses from the men in the class were 180,300,60,480,0,90,300,14,600,360, 120,0,240

Compare the women to the men using a dotplot. What does your plot show you about the difference between the men and the women?

Suppose that a polling organization is conducting a survey to estimate the proportion of Americans who regularly attend religious services. The organization plans to gather data from a randomly selected sample of 550 individuals. On the basis of the "conservative" estimate, what will be the margin of error for the survey?

Students in a statistics class at Penn State were asked, "About how many minutes do you typically exercise in a week?" Responses from the women in the class were 60, 240 , 0, 360, 450, 200, 100, 70, 240 ,0 , 60, 360, 180, 300, 0, 270 Responses from the men in the class were 180, 300, 60, 480, 0, 90, 300, 14, 600, 360, 120, 0, 240

Do you think there's a "significant" difference between the weekly amount that men and women exercise? Explain

About 8% of males are colorblind. A researcher needs some colorblind subjects for an experiment and begins checking potential subjects. On average, how many men should the researcher expect to check to find one who is colorblind?

A researcher records the number of people who use a coupon when they dine at a certain restaurant. Identify the method of data collection.

Write the missing exponent.

$$8 = 2^{\square}$$

a. Identify two general kinds of change that occur between infancy and adulthood. Give an example of each. b. Describe what happens during puberty. c. Is puberty the most important process that occurs during adolescence? Explain your answer.

The Roper Organization conducted a poll in 1992 (Roper, 1992) in which one of the questions asked was whether or not the respondent had ever seen a ghost. Of the 1525 people in the 18- to 29-year-old age group, 212 said “yes.”

a. What is the risk of someone in this age group having seen a ghost?

b. What is the approximate margin of error that accompanies the proportion in part (a)?

c. What is the interval that is 95% certain to contain the actual proportion of people in this age group who have seen a ghost?

The Roper Organization selected a random sample of adults in the United States for this poll. Suppose listeners to a late-night radio talk show were asked to call and report whether or not they had ever seen a ghost.

What is this type of sample called?

For the following functions and values of a, find f'(a) for $f ( x ) = \frac { 1 } { x ^ { 2 } }$; a=1.

(a) If all rows of A have the same sum s, show that s is an eigenvalue. (b) If all columns of A have the same sum s, show that s is an eigenvalue.