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Suppose that the average number of years to graduate at a university is 4 years, with a standard deviation of 0.5 years. Assume a bell-shaped distribution for years to graduate.
1.From the Empirical Rule, what is a range of values that 95% of the students should graduate between?2.From the Empirical Rule, what is a range of values that 68% of the students should graduate between?3.From the Empirical Rule, what is a range of values that 99.7% of the students should graduate between?4.Suppose that the average height for college men is 66 inches. If the height distribution is bell-shaped, and 95% of the men have heights between 60 inches and 72 inches, what is the standard deviation of heights for this population?
The distribution of 9 ounce bags of a particular bag of potato chips is approximately Normal with a mean of 9.12 ounces and a standard deviation of 0.15 ounces.
If one of the Titanic passengers is randomly selected, find the probability of getting a woman or someone who didn't survive the sinking.
As part of study of the development of the thymus gland, researchers weighed the glands of five chick embryos after 14 days of incubation. Calculate the standard error of the mean.
If the limits of the confidence interval of the difference between the means of two normally distributed populations were 3.5 and 5.5 at the 95% confidence level, then we can conclude that we are 95% certain that there is a significant difference ..
Medical schools last year intended to specialize in family practice. What is the width of a 90% confidence interval for the proportion that plan to specialize in family practice.
A study has been made to compare the nicotine contents of two brands of cigarettes. Ten cigarettes of Brand A have an average nicotine content of 3.1 milligrams with a standard deviation of .5 milligrams
How many city residents must be surveyed in order to have a 95 percent with a precision of plus/minus 3 trips per month.
What is the coefficient of determination, and wat is its meaning?
A multiple choice quiz has 150 questions each with 5 choices and only 1 is the correct answer. What is the probability that sheer guess work yield from 30 to 40 correct answers out of the 150 questions?
How large should n be so that the standard deviation of is no more than 0.01 and sampling distribution
Classic Golf, Inc. manages five courses in the Jacksonville, Florida, area. The Director wishes to study the number of rounds of golf played per weekday at the five courses. He gathered the following sample information.
Compute z values for each and comment on your findings.
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