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The cell phone industry is growing at a rapid pace. Current estimates suggest that 60% of people have cell phones. Suppose 25 people were randomly and independently sampled. Let X be the number of people in the sample having cell phones. A) The variable X follows: aa) Normal distribution. bb) Continuous distribution. cc) Binomial distribution. dd) None of the above. I think it is cc) binomial distribution, but not sure. B) Which of the following are not possible values of X? aa)0 bb)30 cc)10 dd)20. I think it is bb)30, because there is only 25 peole in the sample, but I am probably wrong. C) What is the probability that fewer than half of these samples people currently have cell phones. I believe that in order to solve this part, one must use the binomal table, but I am not sure. D)What is the variance of the number of people in the sample of 25 currently having a cell phone.
What the information do z-scores give that actual heights do no?
The random number generator on calculators randomly generates a number between 0 and 1. The random variable X, the number generated, follows a Uniform Probability Distribution. What is the probability of generating a number between 0 and 0.2?
The famous YS Chang restaurant is open 24 hours a day. Waiters and busboys report for duty at 3am, 7am, 11am, 3pm, 7pm, or 11pm, and each works an 8 hour shift. The following table shows the minimum number of workers needed during the six periods ..
What happens to the Maximum Error of Estimate as the sample size gets larger?
Suppose you were a manager of a business. You can only pick on method to solve the LP problems, which method would you choose and Why?
A random sample of 50 households revealed a mean of $112,000 and a standard deviation of $40,000. What is the standard error of the mean?
Suppose that a certain college class contains 45 students. Of these, 26 are sophomores, 25 are chemistry majors, and 7 are neither. A student is selected at random from the class.
Is the sample size large enough to construct a valid confidence interval for the proportion of debit cardholders who have used their card in making purchases over the Internet?
Within distribution of scores, measures of dispersion give an indication of?
Market researchers would like to know if customers prefer a well-known brand over a generic brand of soft drink. They give a large sample of people the two drinks to taste in a random order and ask them which one tastes better.
The standard deviation of the population of adult female height scores is 3 inches. A random sample of 50 women yields a mean height of 64 inches. Calculate the standard error of the mean.
If W denotes the total number of spaces one moves under these special conditions, find the mean and standard deviation of W.
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