# Intro to Probability & Stats

 True or False? To find the mean, we need to sort the data set in increasing or decreasing order. False The sum does not depend on the order of the addends. (Commutative property.) True or False? To find the median, we need to sort the data set in increasing or decreasing order. Answer: True Question 3 True or False? To find the mode(s), we need to sort the data set in increasing or decreasing order. Answer: False Sorting the data before finding the mode(s) may be convenient, but it is not required. Question 4 In a basketball team, the player mean height is 195 cm, and the standard deviation is 8 cm. One of the players' height is 210 cm tall. Is his height unusually big for this team? Answer: Find the z-score: Because z < 2, this is not an unusually big height. Question 5 A distribution is called left - skewed if its peak is shifted to the left. Answer: False Such distribution is called right - skewed. Question 6 True or False? Every data set has one mean, one median, and one mode. Answer: False A data set may have more than one mode or no mode. Question 7 True or False? For a data set, the mean may be zero while the standard deviation is nonzero. Answer: True Example: -2, -1, 1, 2. Question 8 True or False? For a data set, the mean may be nonzero while the standard deviation is zero. Answer: This is true for any set whose members are equal to each other but not equal to zero. Example: 3 3 3 3 3. Question 9 True or False? The median is more sensitive to extremes than the mean. Answer: False The median depends only on the number(s) located in the middle of the data set. Question 10 How do we compare two values that belong to two different data sets with different means and standard deviations? Answer: We need to compare the z-scores for both values. True True or False? To find the mode(s), we need to sort the data set in increasing or decreasing order. False Sorting the data before finding the mode(s) may be convenient, but it is not required. Ina basketball team, the player mean height is 195 cm, and the standard deviation is 8 cm. One of the players' height is 210 cm tall. Is his height unusually big for this team? Question 5 A distribution is called left - skewed if its peak is shifted to the left. Answer: False Such distribution is called right - skewed. Question 6 True or False? Every data set has one mean, one median, and one mode. Answer: False A data set may have more than one mode or no mode. Question 7 True or False? For a data set, the mean may be zero while the standard deviation is nonzero. Answer: True Example: -2, -1, 1, 2. Question 8 True or False? For a data set, the mean may be nonzero while the standard deviation is zero. Answer: This is true for any set whose members are equal to each other but not equal to zero. Example: 3 3 3 3 3. Question 9 True or False? The median is more sensitive to extremes than the mean. Answer: False The median depends only on the number(s) located in the middle of the data set. Question 10 How do we compare two values that belong to two different data sets with different means and standard deviations? Answer: We need to compare the z-scores for both values. Question 8 True or False? For a data set, the mean may be nonzero while the standard deviation is zero. Answer: This is true for any set whose members are equal to each other but not equal to zero. Example: 3 3 3 3 3. Question 9 True or False? The median is more sensitive to extremes than the mean. Answer: False The median depends only on the number(s) located in the middle of the data set. Question 10 How do we compare two values that belong to two different data sets with different means and standard deviations? Answer: We need to compare the z-scores for both values. Find the z-score: Because z < 2, this is not an unusually big height. A distribution is called left - skewed if its peak is shifted to the left. False Such distribution is called right - skewed. Every data set has one mean, one median, and one mode. A data set may have more than one mode or no mode. True or False? For a data set, the mean may be zero while the standard deviation is nonzero. True Example: -2, -1, 1, 2. True or False? For a data set, the mean may be nonzero while the standard deviation is zero. This is true for any set whose members are equal to each other but not equal to zero. Example: 3 3 3 3 3. True or False? The median is more sensitive to extremes than the mean. False The median depends only on the number(s) located in the middle of the data set. How do we compare two values that belong to two different data sets with different means and standard deviations? We need to compare the z-scores for both values. Authorju1iet ID3939 Card SetIntro to Probability & Stats DescriptionQuestions created by the professor to go over main concepts of Chapter three in Week three. Updated2010-01-10T06:31:37Z Show Answers