VCU STAT 210  Test 2 Practice Test #1(1) (4 pages)
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Test 2 Practice Test #1(1)
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 4
 School:
 Virginia Commonwealth University
 Course:
 Stat 210  Basic Practice of Statistics
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Test 2 Practice Test 1 1 To estimate the mean age of all students attending her university a statistician selected a simple random sample of 15 students Prior to going on vacation the statistician collected data for only 13 of the 15 students and determined that the median age of the 13 students was 21 years The statistician took the data with her on vacation so this median value of 21 is all you know about the ages of those 13 students You do however now know that the last two students were 19 and 31 years of age respectively Based on this information which of the following best describes the median age of all 15 students in the sample A 25 B 21 C 21 53 D 23 67 E Cannot be determined from the information provided A very popular leisure activity in the fall for many people is fantasy football In fantasy football you draft a team of real NFL players and compete head to head with other fantasy owners with scores based on the real performance of the players on your fantasy team The data below gives the number of rushing and receiving touchdowns scored in week 1 of fantasy football for a random sample of 10 teams Use this data to answer questions 2 through 6 Please write your final answer on the line before the question number You can use the calculator or you can choose to do the problems by hand in which case any work you show will be considered for partial credit 7 11 8 12 4 2 Calculate the mean of the data 3 Calculate the median of the data 4 Calculate the range of the data 5 Calculate the standard deviation of the data 6 Calculate the interquartile range of the data 7 6 2 15 7 8 Most fantasy leagues use a standard scoring system where players accumulate points for touchdowns yardage gained either rushing or passing kicking and defensive and special teams plays The data below give the number of fantasy points scored by a random sample of 24 fantasy teams that use the standard scoring system Construct an appropriate stem and leaf plot to graphically display this data 91 108 132 68 77 47 79 82 96 54 64 82 106 88 91 60 79 86 97 61 79 119 102 139 8 Consider the stem and leaf plot constructed in question 7 Use the stem and leaf plot to completely describe the distribution of the standard fantasy scores for this sample of 24 fantasy football teams 9 A few fantasy football leagues use exotic rules that often produce many more points than the points scored in a standard scoring league In one exotic scoring league a team scored 432 points and suppose this score were added to the sample of 24 fantasy points presented in question 7 Clearly this value of 432 would be considered an outlier For each of the following circle YES or NO
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