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Statistics analytical techniques practice exam and memo jun 2014

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2 ATE1A10 / ATE01A1, June 2014 QUESTION 1 Consider the ogive below on the daily activity of a sample of 200 students on Twitter. Cumulative number of students Daily Student Activity on Twitter 250 200 166 150 0 0 10 20 30 How many students sent 30 or more tweets per day? 21 34 148 166 177 QUESTION 2 With reference to Question 1: Most of the students sent how many tweets per day? 0 to less than 10 10 to less than 20 20 to less than 30 30 to less than 40 50 to less than 60 QUESTION 3 With reference to Question 1: Half of the students sent less than how many tweets per day? A) B) C) D) E) 15 16 20 30 100 200 57 50 Number of tweets A) B) C) D) E) 196 129 100 0 A) B) C) D) E) 187 40 50 60 3 ATE1A10 / ATE01A1, June 2014 QUESTION 4 Consider the following graphical representation on the mode of transport for a sample of first year university students: MODE OF TRANSPORT FOR A SAMPLE OF UNIVERSITY STUDENTS Walk Own transport Train Bus Taxi If 120 students use their own transport, how many students travel by taxi approximately? A) B) C) D) E) 180 240 360 480 Impossible to estimate with the given information QUESTION 5 The number of friends on Facebook for a sample of 7 students is listed below: 46 92 53 71 88 107 782 40% of students have less than how many friends? A) B) C) D) 56.6 60.2 74.4 77.8 QUESTION 6 With reference to Question 5: The standard deviation for the number of friends on Facebook is equal to A) 177.0 B) 247.8 C) 267.7 D) 61 ...
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