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<p><strong>Manufacturer Claims</strong></p> <p>You work for a consumer watchdog publication and are testing the advertising claims of a lightbulb manufacturer. The manufacturer claims that the life span of the bulb is normally distributed, with a mean of 2000 hours and a standard deviation of250 hours. You test 20 lightbulbs and get the following life spans.</p> <table border="2" cellspacing="2" cellpadding="2" align="center"> <tbody> <tr> <td style="text-align: center;">2210</td> <td style="text-align: center;">2406</td> <td style="text-align: center;">2267</td> <td style="text-align: center;">1930</td> <td style="text-align: center;">2005</td> <td style="text-align: center;">2502</td> <td style="text-align: center;">1106</td> <td style="text-align: center;">2140</td> <td style="text-align: center;">1949</td> <td style="text-align: center;">1921</td> </tr> <tr> <td style="text-align: center;">2217</td> <td style="text-align: center;">2121</td> <td style="text-align: center;">2004</td> <td style="text-align: center;">1397</td> <td style="text-align: center;">1659</td> <td style="text-align: center;">1577</td> <td style="text-align: center;">2840</td> <td style="text-align: center;">1728</td> <td style="text-align: center;">1209</td> <td style="text-align: center;">1639</td> </tr> </tbody> </table> <p> </p> <ol> <li>Use your graphing calculator to to construct a frequency histogram of the data with 5 classes. Is it reasonable to assume that the life span is normally distributed?<br />{1:MCH:=Yes~No}<br /><br /></li> <li>Find the mean and standard deviation of your sample to three significant figures.<br />«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mi»§#956;«/mi»«mo»=«/mo»«/math» {1:SA:\*~=\#m}<br />«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mi»§#963;«/mi»«mo»=«/mo»«/math» {1:SA:\*~=\#s}<br /><br /></li> <li></li> </ol>
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Tuesday, 5 November 2013, 10:15 AM
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