Another Practice FinalExam (1).xlsx - Econ 232 1 Practice Final Exam A Midwestern manufacturing company produces steel housings for electrical equipment

Another Practice FinalExam (1).xlsx - Econ 232 1 Practice...

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Econ 232 Practice Final Exam 1. A Midwestern manufacturing company produces steel housings for electrical equipment. The main component of the housing is a steel trough that is made out o 14 gauge steel coil. It is produced using a 250-ton progressive punch press with a wipe-down operation that puts two 90-degree forms in the flat steel to make the trough. The distance from one side of the form is critical because of weatherproofin outdoor applications. The measurements of a sample of 30 troughs is given below. a. Obtain the summary statistics for this data set. 8.312 (8 pts.) 8.476 8.436 8.4 8.396 8.343 8.382 8.413 8.444 8.447 8.317 8.484 8.489 8.429 8.405 8.383 8.403 8.414 8.46 b. Present the Five Number Summary for this data 8.439 8.348 distribution is symmetric or skewed. I will 8.414 points if you ask me if you have to do this 8.481 8.412 8.411 8.41 8.419 8.415 8.42 8.427 c. Save Your File NOW. Width of Troughs(inches) set. You MUST do this, regardless of wheth Describe this data set. (32 pts. )
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d. e. If an unusually long or unusually short trough is selected, the machine may need adjustment. Would it be appropriate to use the Empirical Rule to determine if 8.328 Rule is appropriate, use it to determine if 8.328 inches is an unusually short trough, defend your answer. If it is not appropriate, say why it cannot be used for this purpo (2 pts.) 2. The operations manager of a light bulb factory wants to determine whether there is any difference in the average life expectancy of bulbs manufactured on two differen machines. She selected random samples from the two machines, and burned the li bulbs continuously until they burned out. The times until burnout are given below. U the .05 level of significance to test whether there is evidence of a difference in the average life of bulbs produced by the two types of machines. Machine A Machine B a. 341 230 Construct the appropriate chart for this data set. (16 pts.) inches would be an unusually short width? Yes No BOLD ONE. (2 pts.) If the Em State H 0 and H 1 (16 pts.)
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234 414 401 261 515 383 506 186 565 362 134 455 349 419 495 308 255 238 b. c. d. e. At the five percent level of significance, there (is / is not) a difference in the avera life of bulbs produced by the two machines.(16 pts.) 3. On-line grocery stores provide customers with the convenience of shopping at hom but this convenience often comes with a lofty price tag due to the high costs on-line grocery stores incur related to handling and delivery. Peapod, Inc. has been around long time, but a new on-line grocery story, Webvan Group, has just entered the market, and claims to have lower prices. A comparison shopper buys 9 identical ite from the two stores. The results are recorded below. At the .01 level of significance, the average price of the 9 items higher for Peapod than for the Webvan on-line grocery store? Item Peapod Webvan Milk, 1 gallon of 2% $3.33 $2.94 Tide Ultra 100 oz. $8.79 $7.58 Fuji apples (3 lb.) $2.97 $2.41 Chips Ahoy cookies $3.39 $3.16 T-bone steak 1lb.
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  • Spring '14
  • Chu-PingVijverberg

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