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Test 3 Ch 8 – 11
Question 5 of 15 (7 points)
Time Remaining: 2:06:04
A college professor claims that the entering class this year appears to be smarter than entering classes from previous years. He tests a random sample of 16 of
this year’s entering students and finds that their mean IQ score is 119, with standard deviation of 15. The college records indicate that the mean IQ score for
entering students from previous years is 110. If we assume that the IQ scores of this year’s entering class are normally distributed, is there enough evidence to
conclude, at the 0.05 level of significance, that the mean IQ score, J, of this year’s class is greater than that of previous years?
Perform a one-tailed test. Then fill in the table below.
Carry your intermediate computations to at least three decimal places and round your answers as specified in the table. (If necessary, consult a list of formulas.)
The null hypothesis:
H : M = 110
p
S
The alternative hypothesis:
H : M gt; 110
D=0 0-0 0-0
The type of test statistic:
t
Degrees of
freedom:
15
1=0 0-0 0-0
The value of the test statistic:
(Round to at least three
x a ?
decimal places.)
The critical value at the 0.05
level of significance:
(Round to at least three
decimal places.)
Can we conclude, using the 0.05 level of
significance, that the mean IQ score of this year’s
class is greater than that of previous years?
Yes
No
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Statistics and Probability

I am taking a practice test and need help completing the