Time magazine recently polled 500 13-year-olds online to get a glimpse into their world. The results may surprise many people: 13-year-olds in 2005 enjoy their relationships with their parents, are less likely to drink or do drugs than previous generations, and they are highly focused, competitive and determined to succeed. The overscheduled toddlers of the 1990s are now controlling their own schedules, and in many cases, their days are just as jam-packed as ever. It seems today's teens are not only used to being extremely busy, they thrive on it. One result from the Time Poll was that 53 percent of the 13-year-olds polled said their parents are very involved in their lives. Suppose that 200 of the 13-year olds were boys and 300 of them were girls. We wish to find out if the proportion of 13-year old boys and girls who say that their parents are very involved in their lives are the same. Let the boys be represented by subscript 1 and girls by 2 . In the sample, 93 boys and 172 girls said that their parents are very involved in their lives. Under the null hypothesis, what is the numerical value of the estimate for the common population proportion of 13-year olds who say that their parents are very involved in their lives?
Q. 2Time magazine recently polled 500 13-year-olds online to get a glimpse into their world. The results may surprise many people: 13-year-olds in 2005 enjoy their relationships with their parents, are less likely to drink or do drugs than previous generations, and they are highly focused, competitive and determined to succeed. The overscheduled toddlers of the 1990s are now controlling their own schedules, and in many cases, their days are just as jam-packed as ever. It seems today's teens are not only used to being extremely busy, they thrive on it. One result from the Time Poll was that 53 percent of the 13-year-olds polled said their parents are very involved in their lives. Suppose that 200 of the 13-year olds were boys and 300 of them were girls. We wish to find out if the proportion of 13-year old boys and girls who say that their parents are very involved in their lives are the same. Let the boys be represented by subscript 1 and girls by 2 . What are the appropriate null and alternative hypotheses?
Q. 3A study was conducted to learn about drinking and driving habits of male and female college students. Independent random samples of 942 female students and 754 male students were obtained. Of those sampled, 181 female and 181 male students admitted that they had driven after consuming an alcoholic beverage. Is this sufficient evidence to conclude that male college students tend to drive after drinking more frequently than female college students? Let 1 = females and 2 = males, so that the appropriate hypotheses to be tested are: H0: p1 = p2 versus Ha: p1 < p2 . Set the significance level to 0.01. Based on this study, we can conclude that smoking ________ more popular among men.
a. is
b. is not
c. seems to be
d. does not appear to be
Q. 4A study was conducted to learn about drinking and driving habits of male and female college students. Independent random samples of 942 female students and 754 male students were obtained. Of those sampled, 181 female and 181 male students admitted that they had driven after consuming an alcoholic beverage. Is this sufficient evidence to conclude that male college students tend to drive after drinking more frequently than female college students? Let 1 = females and 2 = males, so that the appropriate hypotheses to be tested are: H0: p1 = p2 versus Ha: p1 < p2 . Set the significance level to 0.01. The z-statistic for testing the hypotheses is z = -2.4 . What is the corresponding p-value?
a. 0.0041
b. 0.0164
c. 0.0082
d. 0.9918
Q. 5A study was conducted to learn about drinking and driving habits of male and female college students. Independent random samples of 942 female students and 754 male students were obtained. Of those sampled, 181 female and 181 male students admitted that they had driven after consuming an alcoholic beverage. Is this sufficient evidence to conclude that male college students tend to drive after drinking more frequently than female college students? Let 1 = females and 2 = males, so that the appropriate hypotheses to be tested are: H0: p1 = p2 versus Ha: p1 < p2 . Set the significance level to 0.01. Assuming the null hypothesis is true, what is the estimate of the common population proportion p?
a. 0.213
b. 0.192
c. 0.240
d. 0.216
Q. 6An airport official wants to prove that the p1 = proportion of delayed flights after a storm for Airline A is less than p2 = the proportion of delayed flights for Airline B. Random samples from two airlines after a storm showed that 51 out of 200 of Airline A's flights were delayed, and 60 out of 200 of Airline B's flights were delayed. Report your conclusion in terms of the two airlines.
a. The proportion of delayed flights for Airline A seems to be less than the proportion of delayed flights for Airline B.
b. The results are not statistically significant: there is not enough evidence to conclude that the proportion of delayed flights for Airline A is less than the proportion for Airline B.
c. The difference in proportions of delayed flights is at least 4.
d. The proportion of delayed flights after a storm for Airline A seems to be greater than the proportion of delayed flights after a storm for Airline B.
Q. 7The librarian of a small community library has compiled the number of people who visited the library and the respective number of checked-out books, and created the line chart shown below:
Q. 8zBp7oUSmbiCuzYvnrY5eeai2rwRX4
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 width=495 height=281 />
Interpret the chart
Quick Reply
