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If the variation between sample means is large relative to the variation within the samples, it indicates that there is a real difference between the population means.

Quantitative data are

A random sample of sale prices of homes in Columbus, Ohio yielded the following summary information:      Median = $125,000     Lower quartile = $82,000     Upper quartile = $168,000      Lowest price = $46,000     Highest price = $276,000 Construct a box plot for these data.  Based on this box plot, is the highest selling price of $276,000 a suspect or highly suspect outlier?

An animal scientist wants to determine the degree of association between carcass quality grade (variable X) and selling price per pound of carcass (variable Y).  The data for a random sample of 10 Angus steer carcasses are shown in the following table. Quality grade, X Carcass price per pound, Y 5 $1.09 7 1.19 4 0.99 5 1.04 8 1.21 6 1.18 4 0.94 7 1.15 8 1.23 6 1.12 Find the covariance between carcass quality grade and carcass price per pound.

Suppose that a random sample of 625 measurements is selected from a population with a mean µ = 500 lb and a variance σ2 = 100 lb2.  What is the mean and standard deviation of the sampling distribution of the sample mean?

Suppose that a scientist has 60 mice that he could use in an experiment involving a new drug to treat a certain disease.  The scientist decides to use 6 of the 60 available mice for a small preliminary experiment before conducting a larger study.  The scientist arbitrarily begins at row 20 column 1 of the random number table and goes from left to right across the row.  Which one of the following is the correct random sample of 6 mice? For your convenience, here are rows 20 and 21 of the random number table:       Column       Row 1 2 3 4 5 6 20 07056 97628 33787 09998 42698 06691 21 48663 91245 85828 14346 09172 30168

The mean length of time required to complete the Columbus Marathon was 4.5 hours.  The standard deviation of the times was 0.50 hours.  Assume that the racing times were approximately normally distributed.  What is the probability that a randomly selected runner completed the race in less than 3.6 hours?

Assume that the mean length of time required to complete the Columbus Marathon was 4.5 hours.  Further assume that the standard deviation of the times required to complete the race was 0.50 hours.  One runner completed the race in 5.0 hours.  Calculate the z-score for the runner with the time of 5.0 hours.  Based on this z-score, is this time of 5.0 hours an outlier?  Why or why not?

Suppose x has a binomial probability distribution with n = 150 and p = 0.60.  We want to determine if it is appropriate to use the normal approximation to the binomial.  Which one of the following statements is true?

A Gallop poll is conducted to estimate the proportion of voters who plan to vote in favor of a certain issue on the ballot.  A random sample of 500 people of voting age is selected.  Results of the poll show that 300 of the 500 people polled plan to vote in favor of the issue.  What is the point estimate of the true population proportion of people who plan to vote in favor of the issue?