Warm up on 7-3

The New York Times and CBS News conducted a nationwide poll of 1,048 randomly selected 13- to 17-year-olds. Of these 1048 teenagers, 692 had a television in their room. What is the proportion (p-hat) of all people in this age group who had a TV in their room at the time of the poll?

• .340

• .660

• 1.511

• .023

In a random sample, 141 of 400 persons given a flu vaccine experienced some discomfort. What is the q-hat in this sample?

• .353

• .647

• 2.841

• -342

If 827 represents "no" voters out of 2584, construct a 95% confidence interval for the "no" group.

• .300 < p < .340

• .298 < p < .342

• .302 < p < .338

• .288 < p < .352

Find the minimum sample size needed to be 4% within the true proportion if you are 95% confident and p-hat = 0.6

• 2401

• 6

• 49

• 577

It was found that in a sample of 90 teenage boys, 70% of them have received speeding tickets. What is the 90% confidence interval of the true proportion of teenage boys who have received speeding tickets?

• .621< p < .780

• .591< p < .812

• .584< p < .830

• .615< p < .805

A recent poll of 700 people who work indoors found that 278 of them smoke.  The researchers want to be 90% confident that this proportion is within 3.5%. Of the following, which is the smallest sample size that will satisfy the manufacturer's requirements?

• 550
• 450
• 600
• 220

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