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The 1989 Teenage Attitudes and Practices Survey (see Ref. 2) obtained completed questionnaires, either by telephone or mail, from a randomly selected group of 9,965 12-18-year-olds living in households across the country.
One type of question asked the teenagers being interviewed about the perceived behavior of their peers. The teenagers answering the questions are classified as
One question was, "Do your peers care about keeping their weight down?" The data shown are the population projections (in thousands) calculated from the sample responses.
a. Why would a question be formed in terms of peer behavior rather than as a direct question to the person being interviewed?
b. Approximately how many teenagers in the United States never smoked (as of 1989)?
c. What proportion of teenagers thought their peers cared a lot about keeping their weight down?
d. Approximately how many teenage current smokers were there in the United States in 1989? What proportion of them thought their peers cared a lot about keeping their weight down?
The equation for the line of best fit is given as Y = 1.8x + 28.7, and the Pearson correlation coefficient was 0.61. Was the correlation coefficient significantly different from zero? Use α = 0.05.
computed using a Binomial Distribution
a) What is the mean number of stops per hour? b) What is the standard deviation of stops per hour?
The margin of error was reported at 3% for a 95% confidence interval. Give the 95% confidence interval for the percent of all American adults that say they are overweight.
1. thirty eight percent of young adults say they use credit cards because of the rewards program. seven young adults
question 1 as part of his review for a chemistry test a student randomly selects without replacement 40 out of 102
Nancy believes that the average running time of movies is equal to 140 minutes. A sample of 4 movies was taken and the following running times were obtained. Assume the population of the running times is normally distributed.
Also, assume that X = number among 20 randomly selected coffee purchasers who select a national brand, and that the random variable X follows the binomial distribution.a. What is the probably that at most 15 customers choose a national brand?
Assuming normality of the distribution of monthly sales, for a minimum monthly goal of $42,000, what is the lower capability index? In what proportion of the time will the goal value be met?
a study was conducted to determine whether big-city and small-town dwellers differed in their helpfulness to strangers.
the mathematics department is interested in observing the performance of their first-year undergraduate students. the
one of the issues that environmental engineers are concerned with involves lake pollution. suppose for a given lake a
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