stat119 f06 exam1

stat119 f06 exam1 - Instructor_ Class Meeting Time_ Name_...

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Instructor____________________ Name_______________________ Class Meeting Time___________ Red Id____________________ STAT 119 EXAM ONE October 4, 2006 Form A You have 90 minutes to complete this exam. Mark your answers neatly on the exam and be sure to show all your work . Please round your answers to four digits after the decimal when possible. Make sure to put your final answers neatly within the answer boxes (when provided). Please CIRCLE the correct answer and use CAPITAL LETTERS in the space provided for the multiple choice. BE CAREFUL! GOOD LUCK! Page 1 Total________ Page 2 Total________ Page 3 Total________ Page 4 Total________ Page 5 Total________ Page 6 Total________ Page 7 Total________ Page 8 Total________ Total_____________________ σ μ - = X Z μ σ + = z X
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A Multiple choice questions are worth 2 points each 1. The National Opinion Research Center at the University of Chicago conducted a survey where they obtained data involving the number of hours of watching television in a typical day and the age of 1913 randomly sampled participants. The resulting regression equation and correlation coefficient were; 632 . 0 0173 . 0 19 . 2 ˆ = + = r with x y where hours of watching television was the response variable and age was the explanatory variable. The correct way to interpret this slope is; A. For every 1 year increase in age, there is a 2.19 hour increase in television watching. B. For every 1 hour increase in television watching, age increases by 0.0173. C. For every 1 year increase in age, hours of watching television increase by 0.0173. D. For every 1 year increase in age, hours of watching television increase by 0.632 E. For every 1 hour increase in television watching, age increases by 2.19. Answer : 2. The values that you need in order to determine the outlier fences for a boxplot are: A. Mean, Range, IQR B. The potential outlier, IQR, Median C. Q1, Median, IQR D. Q1, Q3, IQR Answer : 3. Which of the following concerning standardizing into z scores is FALSE? A. Standardizing changes the shape of the distribution B. Standardizing requires that data be normal or approximately normally distributed C. Standardizing changes the mean of the distribution to 0 D. Standardizing changes the standard deviation of the distribution to 1. Answer : 4. The output from a sewage treatment plant is constantly monitored to assess treatment efficacy. Suppose that the mean coliform content is 20 bacteria/ml with a standard deviation of 4 bacteria/ ml. An automatic measuring device is being used to monitor the bacterial levels. An alarm should ring whenever the bacterial level exceeds the 97.5th percentile. The coliform content level representing the upper bound is: A. 24 per ml B. 28 per ml C. 12 per ml D. 32 per ml E. 16 per ml Answer Total:______________(8) 2
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A 5. A residual plot with bad predictive power could have any of the following characteristics except which one of the following? A.
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stat119 f06 exam1 - Instructor_ Class Meeting Time_ Name_...

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