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Suppose a simple random sample of size n = 34 is obtained from a population with μ = 30 and σ = 4.
a)Is the sampling distribution of x approximately normal.b)What is P(x > 30.2)?c)What is P(x ≤ 30.6)?d)What is P(28.7 ≤ x ≤ 31.1)?
Suppose that the population of heights of male college students is approximately normally distributed with mean m of 68 inches and standard deviation s of 3.75 inches. A random sample of 16 heights is obtained.
Suppose that the distribution of weekly water usage for single-family homes in a particular city is mound shaped and approximately symmetric. The mean is 1400 gallons, and the standard deviation is 300 gallons.
Determine following probabilities where Z follows standard Normal distribution?
A party, and 35% stay home. Seventeen people are randomly selected. Can the probability that exactly 4 of them stay home be computed using a binomial model?
A group of 20 sales associates agree to go through a week-long sales class to improve their productivity. The amount of their sales are computed for one month before and one month after the training course.
Rental car gasoline prices per gallon were sampled at eight major airports. Date for Hertz and National car rental companies follow (USA today April 4, 2000)
A group of 3 students is to be selected from a group of 12 students to take part in a class in cell biology.
The average burglary rate for a particular jurisdiction has been 311 per year with a standard deviation of 50. What is the likelihood that the number of burglaries in the next year is between 250 and 300?
standard deviation of the heights of young men is about 2.8 inches. suppose (unknown to you) the mean height of all male students is 70 inches. you measure 25 students. what is the sampling distribution of their average height x bar?
The sample information is reported below. At the .10 significance level can we conclude that there is a difference in the amounts quoted?
Utilize a test of the difference among proportions when answering these questions. Illustrate the research hypothesis.
Stores A, B, and C, have 50, 75, and 100 employees and respectively 50%, 60%, and 70% if these employees are women. Resignations are equally likely among all employees regardless of sex. One employee resigns and she is a woman. What is the probabi..
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