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Q1:
True.
Looks like a linear + noise and it also looks like the 
the difference between train and no-train could be covered with
a change in the intercepts which is what the dummy variable does.

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Q2:
.4
The other choices are obviously too big or too small.

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Q3:
.64 +/- .24 does not include 0.
False

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Q4:
19.5 +/- 4.4 does not include 0.
False

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Q5:
> 16.85 + 110*.64 + 19.55
[1] 106.8

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Q6:
> 16.85 + 110*.64 
[1] 87.25

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Q7:
> 4*9.47
[1] 37.88

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Q8:
> sqrt(.6008)
[1] 0.7751129


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Q9:
.63