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Telemarketing
Telemarketers continue to attempt to reach consumers by calling landline phone numbers. According to estimates from a national 2003 survey,based on face-to-face interviews in 16,677 households, approximately 58.2% of U.S. adults have both a landline in their residence and a cell phone, 2.8% have only cell phone service but no land line, and 1.6% have no telephone service at all.
a) Polling agencies won't phone cell phone numbers be- cause customers object to paying for such calls. What pro- portion of U.S. households can be reached by a landline call?
b) Are having a cell phone and having a landline indepen- dent? Explain.
Among 9 electrical components exactly one is known not to function properly. If 3 components are randomly selected, find the probability that all selected components function properly.
Aimed at finding substantial earnings decreases, a random sample of 23 firms with substantial earnings decreases showed that the mean return on assets 3 years previously was 0.058 and the sample standard deviation was 0.055.
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What is the probability that the sample mean will be greater than M = 510. In symbols, what is p (M>510)?
Find the mean and the standard deviation of the sampling distribution of x, and find an interval containing 95.44 percent of all possible sample mean returns.
Confirm whether given random variable is binomial distribution or not. If this experiment is finished with replacement, explain why.
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