Midterm 2006 - Nov 7 2006 Answer all four questions ECON...

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Nov. 7, 2006 ECON 240A- 1 L. Phillips Midterm Answer all four questions. 1. (20) A list of housing prices, in thousands, for homes sold in a recent year for a suburb in Los Angeles follows: 289 205 244 208 218 222 255 198 230 215 209 222 270 341 306 222 195 206 200 221 340 210 209 224 242 209 219 250 272 222 229 213 220 220 226 250 260 209 252 247 213 273 212 217 246 a. How many observations are there?___ b. What is the minimum price?___ What is the maximum price?___ c. Draw a stem and leaf diagram. To save time you do not have to order the leaves. d. Define and provide a numerical value of the central tendency ___ e. Is this distribution symmetric? ____ 2. (20) The data for shuttle launches prior to the Challenger disaster follows. The data is divided into three groups by launch temperature, Low: 53-67 degrees Fahrenheit, Moderate: 68-73 degrees Fahrenheit, and High: 75-81 degrees Fahrenheit. As discussed in class, a no means there were zero o-ring failures for the launch. A yes means there were one or more o-ring failures.
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Nov. 7, 2006 ECON 240A- 2 L. Phillips Midterm Low Moderate High Temp F O-Ring Failure Temp F O-Ring Failure Temp F O-Ring Failure 53 yes 68 no 75 yes 57 yes 69 no 75 no 58 yes 70 no 76 no 63 yes 70 yes 76 no 66 no 70 yes 78 no 67 no 70 no 79 no 67 no 72 no 80 no 67 no 73 no 81 no a. What is the probability of a launch with an o-ring failing for the Low temperature sub-sample? ____ b. What is the probability of a launch with an o-ring failing for the Moderate temperature sub-sample? ____ c.
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