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According to the Sacramento Bee, Americans are not getting enough sleep per night. Assume that the distribution of sleep hours for Americans is Normal and has standard deviation 2 hours. Suppose we take many SRSs of Americans, each of size 10, and calculate the average hours of sleep per night for each sample. According to the 95 part of the 68-95-99.7 rule, 95% of all values of fall within __________ on either side of the unknown mean . What is the missing number?
What then is the probability that a shaft will be acceptable? Suppose that the diameter of the shaft is a random variable that is Normally distributed.
Compute the relative frequencies and percentages for all classes. Draw a histogram and a polygon for the relative frequency distribution.
Fidelity Magellan is a large cap growth mutual fund and Fidelity Small Cap Stock is a small cap growth mutual fund (Morningstar Funds 500, 2006).
Compare these with the percentages specified by Tchebysheff's Theorem.
One of the questions asked on the survey to purchasing agents is: Do you think the economy is expanding? Last month, of the 300 responses 160 answered yes to the question.
One of 4 bus drivers is also arbitarily selected. Let Y denote number of students on his bus. Calculate the expectations of X and Y.
The management of a department store is interested in estimating the difference between the mean credit purchases of customers using the store's credit card versus those customers using a national major credit card.
The weight of an egg produced by a certain breed of hen is normally distributed with mean 66.1 grams (g) and standard deviation 5.5 g. If cartons of such eggs can be considered to be SRSs of size 12 from the population of all eggs, what is the pro..
A pair of dice is rolled. What is the probability of each of the following? (Round your answers to three decimal places.)
Find the critical value for a right-tailed F-test when alpha=.05 the degrees of freedom for the numerator (d.f.N.) are 15, and the degrees of freedom for the denominator (d.f.N.) are 21.
What is the relationship between the value for degrees of freedom and the shape of the t distribution? What happens to the critical value of t for a particular alpha level of df increases in value?
Random sample of 85 group leaders, spent 6.5 years on job before being promoted standard deviation of sample was 1.7 years create 95 percent confience interval.
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