practice_probs_exam1_350

practice_probs_exam1_350 - BUS/ST 350 Practice Problems for...

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BUS/ST 350 Reiland Practice Problems for Exam 1 Material covered : Course Pack : Lecture Unit 1, Lecture Unit 2 WARNING: these practice problems may not cover all the material for which you are responsible! Some of these practice problems require more computation than will be required on the exam. 1. The heights of American men aged 18 to 24 are approximately symmetric and mound shaped with mean 68 inches and standard deviation 2.5 inches. Half of all young men are shorter than what height? 2. Use the information in Problem 1 and the 68-95-99.7 rule to determine the percent of young men that are taller than 6' 1". 3. The grade point averages (GPA) of 7 randomly chosen students in a statistics class are 3.14 2.37 2.94 3.60 1.70 4.00 1.85 Find these statistics: a) mean b) median and quartiles c) range and IQR 4. Refer to the information given in the previous problem. If ( 4.51, then the standard ! xx ) œ # deviation is a) .75 b) .87 c) .64 d) .80 e) none of the above 5. A clerk entering salary data into a company spreadsheet accidentally put an extra “0” in the boss's salary, listing it as $2,000,000 instead of $200,000. Explain how this will affect these summary statistics for the company payroll: a) measures of center: mean and median b) measures of spread: range, IQR, and standard deviation 6. A standardized test designed to measure math anxiety has a mean of 100 and a standard deviation of 10 in the population of first year college students. Which of the following observations would you suspect is an outlier? a) 150 b) 100 c) 90 d) 85 e) none of the above 7. Below is a stem-and-leaf display of the total number of points scored by both teams in the first 41 Super Bowl games. 7:5 denotes 75 points. Find the median and Q " Þ 2 : 123 2 : 79 3 : 011 3 : 6777899 4 : 1344 4 : 5566777 5 : 0234 5 : 5669 6 : 11 6 : 5699 7 : 7 : 5
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BUS/ST 350 page 2 Practice Problems for Exam 1 8. The distribution represented by the histogram below is: f | | |----- | | | |----- | | |----- | | | |---- | | | |----- | - | | | | | |----- | | | | | | | |----- | | | | | | | | |----- | | | | | | | | | |----- | | | | | | | | | | |----- | --------------------------------------------------------------------------- X 0 1 2 3 4 5 6 7 8 9 10 Choose one of the following: a) skewed to the right.
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This note was uploaded on 03/27/2009 for the course BUS Bus350 taught by Professor Reiland during the Spring '09 term at N.C. State.

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practice_probs_exam1_350 - BUS/ST 350 Practice Problems for...

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