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Suppose that 40% of a large number of students who have to buy a textbook for a particular course want a new copy, whereas the other 60% want a used copy. Consider randomly selecting 25 purchasers. What is the distribution of the number of students who want new books? What are the mean value and standard deviation of the number of students who want new books? What is the probability that the number of students who want new books is more than two standard deviations above the mean? The book store has 15 used book and 15 new books. If the 25 purchasers come in one by one to purchase this textbook, what is the probability that all 25 get the type of book they want from the current.
If the sample standard deviation is s = 10, are the data sufficient to conclude that the treatment has significant effect using a two-tailed test with α = .05?
Illustrate what amount of sales would be required to be a super savings club member. Elucidate amount of sales would be required to be a gold club status.
Select a legitimate sampling strategy and collect at least 30 data points using your created question or topic. Discuss the sampling strategy in sufficient detail so that someone else could repeat your data collection without any difficulties or q..
A simple random sample of 1000 Americans found that 61% were satisfied with the service provided by the dealer from which they bought their car.
Compute the standard error of the mean O(funny o with line) line over x, for sample sizes of 50, 100, 15o, and 200. What can you say about the size of the standard error of the mean as the sample size is increased?
What is the percentile rank for X=6? What is the percentile rank for X=9? For the following scores, the lowest value is X=13. Place the scores in a frequency table using.
What is the probability of the person is 20 to 24 years old.What is the probability of the person is 20 to 34 years old.
The sampling distribution of mean score is approximately Normal. It has mean. What is its standard deviation?
Consider a liter of 5 puppies (3 brown/2 black). Draw a probability tree indicating the probabilities for selecting 3 puppies without replacement? What is the probability that I will select 3 brown puppies? 1 brown and 2 black puppies? At least 1 ..
Sample from a normal population having a standard deviation of 0.04, what is the probability that the mean of a random sample of size 25 will be "off" by at most 0.02.
"If you took 40 employees at random from the corporation, there is a pretty good chance the average number of days absent would be 12 or more. That's what happened to us-chance variation." Is this a good defense? Justify your answer.
Let Y be the number of envelopes for which the machine fails to remove a check. Using the Central Limit Theorem to approximate P{Y≤10}.
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