Unformatted text preview: – 1 degrees of freedom. x − µ0
, where s is the sample standard
s/ n Examples:
10. Mr. Murphy is an avid golfer. Suppose he has been using the same golf clubs for quite some time.
Based on this experience, he knows that his average distance when hitting a ball with his current driver
(the longesthitting club) under ideal conditions is 200 yards with a standard deviation of 9. After some
preliminary swings with a new driver, he obtained the following sample of driving distances:
205 198 220 210 194 201 213 191 211 203
He feels that the new club does a better job. Do you agree? 13. An association of college bookstores reported that the average amount of money spent by students
on textbooks for the Fall 2010 semester was $325.16. A random sample of 75 students at the local
campus of the state university indicated an average bill for textbooks for the semester in question to be
$312.34 with a standard deviation of $76.42. Do these data provide significant evidence that the actual
average bill is different from the $325.16 reported? Test at the 1% significance level...
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 Spring '08
 HAFEEZ
 Statistics, Null hypothesis, Statistical hypothesis testing, $76.42, $312.34, $325.16

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