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When an opinion poll calls residential telephone numbers at random, only 20% of the calls reach a live person. You watch the random digit dialing machine make 15 calls.
a) What is the mean number of calls that reach a person?
b) What is the standard deviation of the count of calls that reach a person?
A study of 49 business graduates reported 42 students listed stats 100 as their least favorite class. what would be the 99.8% confidence interval of the proportion of business students who hate, hate, hate business?
Of the registered voters contacted, 33% are registered Democrats. Is each of the boldface numbers a parameter or a statistic?
A department store, on average, has daily sales of $29,876.76. The standard deviation of sales is $1000.00. On Tuesday, the store sold $34,893.71 worth of goods.
Compute the pdf of continuous random variable Z where Z = X + Y and X is a continuous random variable uniformly distributed on [0, 2] and Y is a continuous random variable uniformly distributed on [0, 4]. Assume that X and Y are independent.
1.a manufacturer of infant formula is running an experiment using the standard control formula and two new formulas a
Normal distribution of 5 pounds per square inch, standard deviation of 1.5 pounds per square inch, what proportion have less that 3.17 pounds per square inch, at least 3.6 pounds, are between 5 and 5.5 and 95% will be contained between what two va..
The club professional at a difficult public course boasts that his course is so tough that the average golfer loses a dozen or more golf balls during a round of golf.
Why is it important to study ethics in statistics? Have you seen statistics misused? Without naming specific companies or people, can you provide examples?
Given that consumer changed te brands, what is the probability that consumer purchased fewer products than before?
calls to a telephone system follow a poisson distribution with a mean of five calls per minute.a what is the name
suppose it is known that 45 of the population are coalition voters 45 are alp voters and 10 vote for greens. suppose it
Let X be the number of calls you need to make until you find your friend. Give the probability mass function for X. How many calls do you expect to make until you find your friend?
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