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Chapter 10: Q 33. (page 644)
Which of the following is the correct margin of error for a confidence interval for the difference in the proportion of male and female college students who worked for pay last summer?
a.
b.
c.
d.
e.
Option (c) is correct.
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Which inference method?
a. Drowning in bathtubs is a major cause of death in children less thanyears old. A random sample of parents was asked many questions related to bathtub safety. Overall,of the sample said they used baby bathtubs for infants. Estimate the percent of all parents of young children who use baby bathtubs.
b. How seriously do people view speeding in comparison with other annoying behaviors? A large random sample of adults was asked to rate a number of behaviors on a scale of(no problem at all) to(very severe problem). Do speeding drivers get a higher average rating than noisy neighbors?
c. You have data from interviews with a random sample of students who failed to graduate from a particular college inyears and also from a random sample of students who entered at the same time and did graduate withinyears. You will use these data to estimate the difference in the percent's of students from rural backgrounds among dropouts and graduates.
d. Do experienced computer-game players earn higher scores when they play with someone present to cheer them on or when they play alone? Fifty teenagers with experience playing a particular computer game have volunteered for a study. We randomly assign of them to play the game alone and the otherto play the game with a supporter present. Each player鈥檚 score is recorded.
Researchers suspect that Variety A tomato plants have a different average yield than Variety B tomato plants. To find out, researchers randomly selectVariety A andVariety B tomato plants. Then the researchers divide in half each ofsmall plots of land in different locations. For each plot, a coin toss determines which half of the plot gets a Variety A plant; a Variety B plant goes in the other half. After harvest, they compare the yield in pounds for the plants at each location. Thedifferences (Variety A 鈭� Variety B) in yield are recorded. A graph of the differences looks roughly symmetric and single-peaked with no outliers. The mean difference is and the standard deviation of the differences is s A-B.Let 渭A鈭払 = the true mean difference (Variety A 鈭� Variety B) in yield for tomato plants of these two varieties.
A 95% confidence interval foris given by
a.
b.
c.
d.
e.
Steroids in high school Refer to Exercise 16.
a. Explain why the sample results give some evidence for the alternative hypothesis.
b. Calculate the standardized test statistic and P-value.
c. What conclusion would you make?
Flight times The pilot suspects that the Dubai-to-Doha outbound flight typically takes longer. If so, the difference (Outbound鈭扲eturn) in flight times will be positive on more days than it is negative. What if either flight is equally likely to take longer? Then we can model the outcome on a randomly selected day with a coin toss. Heads means the Dubai-to-Doha outbound flight lasts longer; tails means the Doha-to-Dubai return flight lasts longer. To imitate a random sample of days, imagine tossing a fair coin times.
a. Find the probability of getting or more heads in tosses of a fair coin.
b. The outbound flight took longer on of the days. Based on your result in part (a), what conclusion would you make about the Emirates pilot鈥檚 suspicion?
According to sleep researchers, if you are between the ages of and years old, you need 9 hours of sleep to function well. A simple random sample of students was chosen from a large high school, and these students were asked how much sleep they got the previous night. The mean of the responses was hours with a standard deviation of hours.
Which of the following is the standardized test statistic for the hypothesis test ?
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