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in a recent? year, the scores for the reading portion of a test were normally? distributed, with a mean of 21.8 and a standard deviation of 5.2. Use Table 4 in the back of your text to complete parts? (a) through? (d) below. Scroll to see the entire problem.
(a) Find the probability that a randomly selected high school student who took the reading portion of the test has a score that is less than 16.
?(b) Find the probability that a randomly selected high school student who took the reading portion of the test has a score that is between 17.8 and 25.8.
?(c) Find the probability that a randomly selected high school student who took the reading portion of the test has a score that is more than 32.5.
?(d) Are any of the events in parts a through c considered? unusual? Why or why? not?
Determine the probability distribution for X defined as number of defective items drawn (Hint: You have to determine P(X=0), P(X=1) and P(X=2).
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what would be the highest level of measurement to describe the names of a companys new products? ratio interval ordinal
1. Let X and Y be independent random variables from an exponential distribution with common parameter θ = 1. Show that X/Y has an F -distribution. What is the number for degrees of freedom?
Using the 0.05 level of significance, is the average miles-per-gallon rating on the highway for cars using the new engine different from the rating for cars using the old engine?
the average life span for batteries is 100 hours with a standard deviation of 10 hours. construct a confidence interval
which of the following statements is true with respect to the t-distribution?a the t-distribution is symmetrical.b the
Y is an random variable that equals one when an individual goes to college and zero when he or she does not. X is another random vari- able that captures the individual's quartile in the income distribution. Specically, X = 1 if the individual is ..
In the Willow Brook National Bank waiting line system (see Problem 1), assume that the service times for the drive-up teller follow an exponential probability distribution with a service rate of 36 customers per hour or 0.6 customer per minute.
Picking numbers at random I pick two numbers uniformly at random from {1; 2; : : : ; 6n}, with replacement. What is the probability that both numbers choose are divisible by 2?
The mean is 75 and the standard deviation is 6. If 1200 students took the test, approx how many students would be expected to score between 69 and 81?
A demographer, using a random sample of n = 500 people, obtained a 95 percent confidence interval for mean age at marriage (m) in years for US adults. The CI was (26.4, 27.3). Suppose another demographer obtained a separate independent sample of p..
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