Question #1
This question is similar to example #1 on page 37 (slide 11) of the course packet.
A group of 12 security analysts provided estimates of the year 2001 earnings per share
of Qualcomm, Inc. and they are stored
here
.
You have to test whether the population variance is less than 0.01.
1.
The test statistic for testing this claim will have the following distribution:
o
Z distribution
o
t distribution with 11 degrees of freedom
o
Chisquared with 12 degrees of freedom
o
Chisquared with 11 degrees of freedom
2.
The value of the test statistic for testing the claim is
9.296666667
.
3.
Based on your teststat and the critical values provided, what is your
conclusion?
o
Reject the null hypothesis and conclude that the variation is different
than 0.01.
o
Do not reject the null hypothesis and conclude that the variation is less
than 0.01.
o
Reject the null hypothesis and conclude that the variation is equal to
0.01.
o
Do not reject the null hypothesis and conclude that the variation is
equal to 0.01.
o
Do not reject the null hypothesis; there is not enough evidence to
conclude that the variation is less than 0.01.
4.
Construct a 95% confidence interval for the true variance of earnings per
share. The LCL is
0.004241171
.
5.
The UCL is
0.024363941
.
Question #2
Please refer to the example #2 given on page 37 (slide 12) of the course packet.
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 Spring '09
 PETRY
 Normal Distribution, Null hypothesis, Statistical hypothesis testing, LCL

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