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A sample of 3000 observations has a mean of 85 and a standard deviation of 10. The distribution is bell-shaped. Using the empirical rule, find what percentage of the observations fall in the intervals
Suppose that a random requisition is found to have been incorrectly entered. What is the probability that it was processed by data entry specialist 3?
After an unusually dry atumn, a radio announcer ia heard to say, "Watch out! We'll pay for these sunny days later on this winter." Explain what he's trying to say, and comment on the validity of his reasoning.
The cost of each book is a random variable with mean 30. What is the expected value of his total expenditure? Find the joint PMF of K and N. Find the marginal PMF of N.
X1, X2, X3, ... Xn are n independent, identically distributed random variables with expectation of 5 and variance of 4 (E[Xi] = 5, Var (Xi) = 4) and n is large. Determine Var(Y)?
Solve the following questions involving fundamental operations on polynomials. Solve the following problems involving applications of polynomials.
Based on the boxplots in part (a), which of the two groups, students or teachers, tends to have watch times that are closer to the true time? explain you choice.
A researcher plans a study in which a crucial step is offering participants a food reward. It is important that the three food rewards be equal in appeal.
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.
Estimate the percentage who weigh more than 180 pounds? Assume that we want 96% confidence that the error is no more than 1.5 percentage points.
To find out whether living next to high-voltage power lines increases your chance of getting cancer, researchers selected various homes at random.
If we know that the length of time it takes a college student to find a parking spot in library parking lot follows a normal distribution with mean of 3.5 minutes and a standard deviation of 1 minute, determine the probability that a randomly sele..
In the survey of 8000 women, 5431 say they change their nail polish once the week. Create the 99% confidence interval for population proportion of women who change their nail polish once a week.
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