<PRE><B>Question 1196343</B>
the mean is 17.7 pictures
s=9.08
the t value for (0.975, df=9) is 2.262
the half-interval is t*s/sqrt(10)=6.50
the CI is (11.2, 24.2)  pictures are the unit
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Ho: mean is &lt;=15
Ha: mean is  &gt;15
alpha=0.10 p {reject Ho\Ho true}
test is a t (0.95, df=9) for a critical value of t= 1.833
t=(17.7-15)/s/qrt(n)
=1.6*sqrt(10)/9.08=0.94 Insufficient evidence to say that the mean is &gt;15.  The sample number is but the p-value of 0.19 says that if the sample mean were 15, there would be a 19% chance of having a value of this or more extreme.
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