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practise questions - Sheet1 Page 1 STA 2023 Practice...

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Unformatted text preview: 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 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? a) Around 105 b) Around 135 c) Around 155 d) Around 165 3 Does this graph have any outliers? a) Yes, 94 is an outlier b) Yes, 165 is an outlier c) No, the numbers are too close together d) No, N is too small to have outliers d 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 TestTime 4 About how many students took longer than 90 minutes to finish their test? a) About 5 b) About 10 c) About 20 d) About 105 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? a) The mean will be slightly larger than the median b) The mean will be slightly smaller than the median c) The mean and median will be exactly equal. Sheet1 Page 3 d) It is impossible to tell from this graph Frequency 0 15 30 45 60 75 90 105 120 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? a) 10 b) 73 c) 75 d) 78 8 What is the IQR (Interquartile Range) of this data? a) 10 b) 13 c) 21 d) 62 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? a) 0 b) 1 c) 4 The Gatorsh Woman Basketball team has played 19 games as of 1/25/02. Here is a Sheet1 Page 4 d) It depends on what kind of standard normal variable you have d A particular type of 4th grade Achievement Test provides overall scores that are normally distributed with a mean of 50 and a standard deviation of 10. Use this information for questions 11-14 11 What is the probability that a randomly selected student earns a score of at least 42?...
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This note was uploaded on 04/24/2008 for the course STA 2023 taught by Professor Ripol during the Spring '08 term at University of Florida.

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practise questions - Sheet1 Page 1 STA 2023 Practice...

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