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Chapter 4: Q. T4.2 (page 289)
You want to take a simple random sample (SRS) of of thestudents who live in
a dormitory on campus. You label the students in alphabetical order. In the
table of random digits, you read the entries
The first three students in your sample have labels.
The correct option is:
(e
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Suppose that 35% of the voters in a state are registered as Republicans, 40% as
Democrats, and 25% as Independents. A newspaper wants to select a sample of 1000
registered voters to predict the outcome of the next election. If it randomly selects 350
Republicans, randomly selects 400 Democrats, and randomly selects 250 Independents,
did this sampling procedure result in a simple random sample of registered voters from
this state?
a. Yes, because each registered voter had the same chance of being chosen.
b. Yes, because random chance was involved.
c. No, because not all registered voters had the same chance of being chosen.
d. No, because a different number of registered voters was selected from each party.
e. No, because not all possible groups of 1000 registered voters had the same chance of
being chosen.
A farmer is experimenting to determine which variety of apple trees, Fuji or Gala, will produce more fruit in his orchard. The orchard is divided into equally sized square plots. He has trees of each variety and randomly assigns each tree to a separate plot in the orchard. What is the experimental unit (s) in this study? a. The trees; b. The farmer; c. The plots d. The orchard e. The apples
High-speed Internet Laying fiber-optic cable is expensive. Cable companies want to make sure that if they extend their lines to less dense suburban or rural areas, there will be sufficient demand so the work will be cost-effective. They decide to conduct a survey to determine the proportion of households in a rural subdivision that would buy the service. They select a simple random sample of blocks in the subdivision and survey each family that lives on one of those blocks.
a. What is the name for this kind of sampling method?
b. Give a possible reason why the cable company chose this method.
Immigration reform A news organization wants to know what percent of U.S. residents support a 鈥減athway to citizenship鈥� for people who live in the United States illegally. The news organization randomly selects registered voters for the survey. Describe how under coverage might lead to bias in this study. Explain the likely direction of the bias.
Miami's car colorsUsing a webcam, a traffic analyst selected a random sample of cars traveling on I-in Miami on a weekday morning. Among the cars in the sample, were white. The margin of error for this estimate is percentage points.
a. Would you be surprised if a census revealed that of cars on in Miami on a weekday morning were white? Explain your answer.
b. Explain how the traffic analyst could decrease the margin of error.
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