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 Statistics Chapter Test

 1 . Last quarter, 33.8% of television viewers in Johnsonville watched WDAY's new afternoon news program. Identify the population whose properties are analyzed by the data in the previous statement. [Hint] 2 . Identify an appropriate frequency distribution for the data set:41, 35, 29, 40, 33, 34, 33, 40, 40, 37, 40, 43, 39, 34, 50, 42, 48, 35, 38, 52. [Hint] 3 . Identify the correct grouped frequency distribution for the histogram. [Hint] 4 . Identify the correct stem-leaf diagram for the data set: 30, 22, 26, 33, 27, 17, 45, 31, 12, 18, 42, 51. [Hint] 5 . Identify the correct frequency distribution for the data set: 40, 20, 25, 25, 35, 30, 40, 55, 35, 45, 50, 20, 25, 35, 45, 50, 40, 50, 30, 40. [Hint] 6 . Find the mean of the following data set: 98, 67, 84, 60, 58, 100, 93. [Hint] 7 . Find the median of the following data set: 98, 67, 84, 60, 58, 100, 93. [Hint] 8 . Find the mode for the following data set: 14, 18, 15, 20, 14, 30, 22, 16, 14. [Hint] 9 . Find the midrange for the following data set: 98, 67, 84, 60, 58, 100, 93. [Hint] 10 . Find the range for the following data set: 98, 67, 84, 60, 58, 100, 93. [Hint] 11 . Find the sample standard deviation for the following data set: 10, 8, 2, 4, 6, 3, 10, 5. [Hint] 12 . Find the mean for the following frequency distribution. [Hint] 13 . Find the median for the following frequency distribution. [Hint] 14 . Find the mode for the following frequency distribution. [Hint] 15 . A prospective client asks a cruise operator about the weekly cost of taking a cruise to the Bahamas. Which measure of central tendency is the best indicator of "average" cost in this situation? [Hint] 16 . The mean time for a runner on a 2-mile course is 10 minutes with a standard deviation of 0.6 minutes. If the runner's times are normally distributed, find the z-score for a time of 11.2 minutes. [Hint] 17 . The playing life of a DVD player is normally distributed with a mean of 600 hours and a standard deviation of 100 hours. Find the percentage of DVD players that will last from 600 to 700 hours. Use the 68-95-99.7rule. [Hint] 18 . If a set of test scores is normally distributed with a mean of 72 and a standard deviation of 15, what percentage of the scores are between 84 and 90? Use the following percentile table. [Hint] 19 . Using a random sample of 50 members from a country club with approximately 1500 members, 70% of the sample said that they were satisfied with the food services at the club. Find the margin of error in this percentage. [Hint] 20 . A set of data is normally distributed with a mean of 650 and a standard deviation of 70. Find the data item in this distribution that corresponds to a z-score of −2.5. [Hint] 21 . Identify the correct scatter plot for the following data. [Hint] 22 . Find the correlation coefficient for the following data. [Hint] 23 . Identify the correlation coefficient that represents a moderate positive correlation between two variables. [Hint] 24 . Find the regression line for the following data set. [Hint] 25 . If the equation of the regression line for an experiment testing the relationship between two variables is y = 3.64 + 1.89x, find an approximate y-value for an x-value of 12. [Hint] Answer choices in this exercise are randomized and will appear in a different order each time the page is loaded.

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