Unformatted text preview: hat is the standardized value for a family vehicle that is 3 years and 3 months old? 0.22 2.5 2.6 2.92 A) B) C) D) 0.1357 0.2704 0.8413 0.8643 Using the standard Normal distribution tables, what is the area under the standard Normal curve corresponding to Z < 1.1? 27 Using the standard Normal distribution tables, what is the area under the standard Normal curve corresponding to Z > –1.22? A) B) C) D) 0.1151 0.1112 0.8849 0.8888 28 Using the standard Normal distribution tables, what is the area under the standard Normal curve corresponding to –0.5 < Z < 1.2? A) 0.3085 B) 0.8849 C) 0.5764 D) 0.2815 29 The variable Z has a standard Normal distribution. Find the value z such that 85% of the observations fall below z. A) z = –1.04 B) z = 0.80 C) z = 0.85 D) z = 1.04 30 The preparation time to mail envelopes with a weekly report to all executives in a company has a Normal distribution with a mean of 35 minutes and a standard deviation of 2 minutes. On 95% of such occasions the mailing preparation takes less than x minutes. What is the value of x? A) B) C) D) x = 31.71 x = 34.75 x = 35.25 x = 38.29 7 J Diaco Elements of Statistics I Supplemental Final Exam Review 31 Which of the following statements about the standardized z‐score of a value of a variable X, which has mean m and standard deviation s, is (are) TRUE? A) The z‐score has a mean equal to 0.
B) The z‐score has a standard deviation equal to 1.
C) The z‐score tells us how many standard deviation units the original observation fall away from the mean. D) The z‐score tells us the direction the observation falls away from the mean. E) All of the above statements about the z‐score are true. 32 A quantile plot of the horsepower of a sample of 65 cars is shown below: Normal Scores Horsepower 300 200 100 0
0 100 200 300 Y
Normal scores Which of the following descriptions best describes the shape of the distribution of horsepower? A) B) C) D) 33. Normal Normal with some outliers Left‐skewed Right‐skewed Fill in the blank. The Environmental Protection Agency records data on the fuel economy of many different makes of cars. They are interested in determining if one could predict the mileage of the car (in miles per gallon) from the weight of the car (in lbs). The variable is the response variable in this study. 34. A) B) C) D) A phenomenon is observed many, many times under identical conditions. The proportion of times a particular event A occurs is recorded. What does this proportion represent? The probability of the event A. The distribution of the event A. The correlation of the event A. The variance of the event A. Use the following to answer questions 35 and 36: The statistics of a particular basketball player state that he makes 4 out of 5 free‐throw attempts. 8 J Diaco Elements of Statistics I Supplemental Final Exam Review 35. A) B) C) D) The basketball player is just about to attempt a free throw. What do you estimate the probability that the player makes this next free throw to be? 0.16 50‐50. Either he makes it or he doesn’t. 0.80 1.2 36. A) B) During a season, the basketball player makes an average of about 200 free‐throw attempts. On how many of these throws would you estimate he will actually score a point? 80 C) 120 100 D) 160 37. A) B) C) D) E) Which of the following statements best describes what is meant by the probability of the outcome of a random phenomenon? The count of the short‐t...
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- Summer '09
- Statistics, J Diaco, Supplemental Final Exam