MGBA 520 - Chapter 3 quiz

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Northern Arizona University *

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520

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Statistics

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Feb 20, 2024

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Question 1 2 / 2 pts Are some of the measures of variability •Geometric Mean •Percentiles •Median •Mode orrect! • Standard Deviation •Coefficient of Variation •Weighted Mean •Quartiles Question 2 2 / 2 pts The mode of a data set is the value in the middle when the data items are arranged in ascending order. True Correct! False Question 3 2 / 2 pts The geometric mean is calculated by finding the nth root of the product of n values. Correct! True False

Question 4 2 / 2 pts A percentile provides information about how the data are spread over the interval from the smallest value to the largest value. Correct! True False Question 5 2 / 2 pts The empirical rule can be used to determine the percentage of data values that must be within a specified number of standard deviations of the mean. Correct! True False Question 6 2 / 2 pts Two descriptive measures of the relationship between two variables are standar deviation and outliers. True Correct! False Question 7 2 / 2 pts

An important numerical measure of the shape of a distribution is called skewness. Correct! True False Question 8 Not yet graded / 6 pts With this exercise data, provide the response for a., b. and c. Hardshell Jacket Ratings. OutdoorGearLab is an organization that tests outdoor gear used for climbing, camping, mountaineering, and backpacking. Suppose that the following data show the ratings of hardshell jackets based on the breathability, durability, versatility, features, mobility, and weight of each jacket. The ratings range from 0 (lowest) to 100 (highest). Rating 42 66 67 71 78 62 61 76 71 67 61 64 61 54 83 63 68 69 81 53 A. Compute the mean, median, and mode. B. Compute the first and third quartiles.

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C. Compute and interpret the 90th percentile. Your Answer:  Mean : 65.5  Median : 67.5  Mode : 61  First Quartile (Q1) : 57.5  Third Quartile (Q3) : 73.5  90th Percentile : 81 [ 0.9 \times 20 = 18] The 18th rating is 81, which is the 90th percentile.