Sample Exam 1

# Sample Exam 1 - ISE 225 Engineering Statistics I Spring...

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ISE 225 Engineering Statistics I Exam #1 Spring Semester 2007 2/7/07 1. The data below were obtained for the issue-by-issue sales of a particular comic book title (in thousands of dollars). 526 432 400 466 410 558 442 387 460 496 406 554 468 502 498 521 485 363 433 489 484 509 530 449 (15) 1.a) Make a stem and leaf plot of the sales data. (10) 1.b) How many cells should one use for a histogram of the same data? (20) 2. Calculate the mean and variance of the values below. 73.7 72.4 66.8 65.6 72.1 87.2 83.2 (20) 3. A consumer protection group wants to estimate a lower bound on the mean gas mileage that a car model achieves under normal driving conditions. They recruit 30 owners of the model and ask each of them to drive a 350-mile course, beginning with a full tank of gas. Then, they refill the owners’ gas tanks and estimate the gas mileage for the trip. The sample mean for the data is 27.3 mpg, with a standard deviation of 1.6 mpg.
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## This note was uploaded on 02/28/2008 for the course ISE 220 taught by Professor Ross during the Fall '05 term at USC.

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