Question 1

Briefly describe these data.Sketch its box plot and describe the sample succinctly.

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Question 2

A team of introductory statistics students went to a grocery store and recorded the total calories and fat calories for various kinds of soup.They produced a table of statistics and two dot plots.Write a succinct summary of the center,variability,and shape for each data set.Note: TrimMean is the 5 percent trimmed mean (removing the smallest 5 percent and the largest 5 percent of the values,rounded to the nearest integer).

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Question 3

Below are the ages of 21 CEOs.Find the mean,median,and mode.Are there any o utliers? Explain.46,48,49,49,50,52,54,55,57,57,58,59,60,61,62,62,63,63,65,67,75

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Question 4

Briefly describe this sample of departure delays on American Airlines flights out of Denver over a seven-day period,March 3−9 (n = 149 flights).

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Question 5

A survey of 10 randomly chosen drivers showed the following number of persons per car,including the driver: 1,5,1,5,2,1,1,1,2,1.Describe the center,variability,and skewness for this sample.

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Question 6

Craig operates a part-time snow-plowing business using a 2002 GMC 2500 HD extended cab short box truck.Describe Craig's gasoline mileage based on this histogram of 195 tanks of gas.

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Question 7

Here are descriptive statistics from Excel for annual per-pupil expenditures in 94 Ohio cities and home sizes in a certain neighborhood.Very briefly compare the variability and shape of the two data sets.

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Question 8

A national survey showed that most commuter cars contain only the driver.Hungry for a story,a campus newspaper reporter asked five randomly chosen commuter students how many occupants,including the driver,rode to school in their cars.Their responses were 1,1,1,1,and 6.The next day a story appeared in the paper headlined "University Commuters Double National Average Ridership." Is this a reasonable assessment of central tendency? How would you characterize the variability of the sample?

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Question 9

The owner of a chicken farm kept track of each hen's eating and egg production for many months,with the results below.Which has more variation,feed consumption or egg output?

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Question 10

Here are advertised prices of 21 used Chevy Blazers.Describe the distribution (center,variability,shape).

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Question 11

A 10-point quiz was given by Professor Ennuyeaux.Of the 10 students in the class,half got zero and the others got perfect scores.List the students' scores.Then find the mean,median,mode,and geometric mean of their scores.Which is the most appropriate measure of center? The least appropriate?

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Question 12

Craig operates a part-time snow-plowing business using a 2002 GMC 2500 HD extended cab short box truck.Describe Craig's gasoline mileage based on this box plot of 195 tanks of gas.

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Question 13

Bob's sample of freshman GPAs showed a mean of 2.72 with a standard deviation of 0.31.(a)What range would you predict for all the grades? For the middle 95 percent? Explain.(b)Why might your estimates be inaccurate?

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Question 14

The athletic departments at 10 randomly selected U.S.universities were asked by the Equal Employment Opportunity Commission to state what percentage of their nursing scholarships were presently held by women.The responses were 5,4,2,1,1,2,10,5,5,5.Find the mean,median,mode,and geometric mean.Which is the most appropriate measure of central tendency? The least appropriate? Explain your answer.Is there an outlier?

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Question 15

Six graduates from Fulsome University's Master's of Waste Management program were hired by a Saudi Arabian firm at $110,000 each,while the other four graduates were unemployed.The university placement office bragged,"Our MWM graduates enjoyed a median starting salary of $110,000." Is this a reasonable assessment of central tendency? What are the alternatives?

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Question 16

Below are shown a dot plot and summary statistics for a random sample of 34 shower heads.The measurements are maximum flow rates (in gallons per minute)at pressure of 80 pounds per square inch.Use the data to illustrate the difference between the two alternative definitions of "outlier," and make any other comments you feel are relevant.Note: Trim Mean removes the smallest 5 percent and the largest 5 percent of the values.

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Quiz 4: Descriptive Statistics