The 21 subjects in the redcolored environment had a mean time for solving the puzzles of 964 seconds with standard deviation 343 the 21 subjects in the bluecolored environment had a mean time of ID: 691664
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Slide1
Calculate t-statistic
19.16
The
21
subjects in the red-colored environment had a mean time for solving the puzzles of
9.64
seconds with standard deviation
3.43
; the 21 subjects in the blue-colored environment had a mean time of
15.84
seconds with standard deviation
8.65
.
The two–sample t statistic for comparing the population means has value
(a) 1.50.
(b) 3.05.
(c) 6.2.
Slide2
Coaching and SAT scores
19.26 Coaching and SAT scores, continued. What we really want to know is whether coached students improve more than
uncoached
students, and whether any advantage is large enough to be worth paying for. Use the information in the previous exercise to answer these questions:(a) Is there good evidence that coached students gained more, on the average, than uncoached students?Hint: H0: μ1 = μ2, Ha: μ1 > μ2Calculate two–sample t statistic:Df = ?Using Table C find the p-value