Exam 1 Review_Solutions (1).pdf - Review Problems 1 Determine whether the following data is qualitative or quantitative a The average miles per gallon

Exam 1 Review_Solutions (1).pdf - Review Problems 1...

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Review Problems 1. Determine whether the following data is qualitative or quantitative: a. The average miles per gallon on all new Fords. Quantitative b. The color of cars parked in the Dan Allen Parking Deck. Qualitative c. The responses to a question that asks you to rank your preference for an item on a scale of 1 to 5 with 1 being worst and 5 being best. Quantitative 2. For each of the above, are the data nominal, ordinal, or interval? a. interval b. nominal c. ordinal 3. Consider the following graph: a. Does there appear to be a relationship between x and y? If yes, how would you describe the relationship? Yes There appears to be a linear relationship between y and x. It is a positive relationship (as x increases, y increases as well). It appears to be a relatively strong relationship. x y Outlier
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b. Which of the following is the most likely value of the correlation between x and y? i. r = 0.75 ii. r = 0.01 iii. r = -0.80 c. Do there appear to be any outliers (unusual observations) in the data set? If yes, which one(s)? Yes See Observation highlighted in graph 4. Consider the following histogram: a. Is the distribution i. Symmetric ii. Skewed to the right iii. Skewed to the left 25 40 55 70 85 100 115 130 145 160 175 190 205 220 alkphos 0 10 20 30 40 Frequency
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b. Do there appear to be any potential outliers in the data? If yes, circle them on the graph. Yes See graph above. c. What measure of center is the most appropriate for describing these data (mean or median)? The median is the most appropriate measure of center for skewed distributions. 5. At a meeting of a college student government council, 50 students are present: 20 freshmen, 15 sophomores, 10 juniors, and 5 seniors. One student is to be randomly selected to deliver a petition to the school administration.
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