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practise questions

# practise questions - STA 2023 Practice Questions Chapter...

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Sheet1 Page 1 STA 2023 Practice Questions Chapter 1~6.3 The practice questions provided are not a substitute for doing the homework or studying the notes. You need to know the z-score formula. Formulas given on exam. sy Sxi sx n n .. xn-x Px()=..p s= x .. . Minitab. Use this graph for questions 1-3 Stem-and-leaf of Bowling N = 18 Leaf Unit = 1.0 1 9 4 1 10 1 11 2 12 8 4 13 12 7 14 346 -6 15 147799 5 16 01445 1 What is the best description for the shape of this graph? yh=a +bx b =ra =y -bx x = (1-p) h=np np(1-p) h=Sx*()Px P(A and B) = P(A) P(B) P( A | B) = P( A and B) / P(B) res= obs y h pred y Here is a stemplot of the scores of Bob the Bowlerhs last 18 bowling games, made by

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Sheet1 Page 2 a) Bell/Mound-shaped b) Skewed to the left c) Skewed to the right d) Uniform 2 Where is the center of this graph? 3 Does this graph have any outliers? One semester, the TA for a math class decided to time how long it took her students to finish their Final Exam. Below is a histogram of the results. Use this graph for questions 4-6 50 40 30 20 10 0 TestTime 4 About how many students took longer than 90 minutes to finish their test? 5 Where is the center of this graph? a) Between 15 and 30 minutes b) Between 45 and 60 minutes c) Between 75 and 90 minutes d) Between 105 and 120 minutes 6 How will the mean and median of these test times relate, based on the graph?
Sheet1 Page 3 0 15 30 45 60 75 90 105 120 0 stemplot, made by Minitab, of the number of points the Lady Gators have scored in each game so far. Use this graph for questions 7-10 Stem-and-leaf of Scores N = 19 Leaf Unit = 1.0 1 4 9 3 5 19 7 6 1248 -5 7 03588 7 8 01348 2 9 03 7 What is the median of this data? 8 What is the IQR (Interquartile Range) of this data? 9 What is the standard deviation of this data? a) 12.78 b) 44 c) 93 d) 163.33 10 If z is a standard normal random variable, what is the variance of z? The Gatorsh Woman Basketball team has played 19 games as of 1/25/02. Here is a

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Page 4 A particular type of 4th grade Achievement Test provides overall scores that are
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