A study indicates that 27% of American teenagers have tattoos. You randomly sample 23 teenagers. Find the mean and the standard deviation of the number of tattoos.
Round your answer to 4 decimal places.
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A study indicates that 27% of American teenagers have tattoos. You randomly sample 23 teenagers. Find...
A study indicates that 80% of American teenagers have tattoos. You randomly sample 5 teenagers. Find the probability that at least 4 will have tattoos. Round your answer to 4 decimal places.
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A study indicates that 40% of American teenagers have tattoos. You randomly sample 25 teenagers. Find the probability that more than 6 will have tattoos. Round your answer to 4 decimal places.
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Information from the American Institute of Insurance indicates the mean amount of life insurance per household in the United States is $165,000. This distribution follows the normal distribution with a standard deviation of $40,000. If we select a random sample of 50 households, what is the standard error of the mean? (Round your answer to the nearest whole number.) What is the expected shape of the distribution of the sample mean? What is the likelihood of selecting a sample with...
A study by Allstate Insurance Co. finds that 82% of teenagers have used cell phones while driving (The Wal/Street Journal, May 5, 2010, Suppose a random sample of 100 teen drivers is taken. [You may find it useful to reference the z table.] a-1. Calculate the standard error for the sampling distribution of the sample proportion. (Do not round intermediate calculations. Round your answer to 4 decimal places.) Standard error a-2. Is the sampling distribution of the sample proportion approximately...
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Each person in a random sample of 224 male teenagers and a random sample of 303 female teenagers was asked how many hours he or she spent online in a typical week. The sample mean and standard deviation were 15.2 hours and 11.3 hours for males and 14.3 and 11.7 for females. (Use a statistical computer package to calculate the P-value. Use μmales − μfemales. Round your test statistic to two decimal places, your df down to the nearest whole...