For each of the following t values (a-d), indicate whether the t statistic is statistically significant...
For each of the following t values (a-d), indicate whether the t statistic is statistically significant for a two-tailed test, at the specified alphas:
- t = 2.90, df = 25, α = 0.01
- t = 2.20, df = 25, α = 0.05
- t = 5.52, df = 10, α = 0.01
- t = 2.02, df = 20, α = 0.05
CAUTION: GET ON THE RIGHT PAGE …..Make sure you use the correct table: pages 413-415 (the difference is the α: is it 0.05, 0.01, or 0.001?).
Remember the definitions of dfb and dfw
dfb (degrees of freedom between): k-1, number of groups minus one (e.g., 3 – 1 = 2)
dfw (degrees of freedom within): N – k (N is the total number of data points, k is number of groups)
Homework Answers
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3) Calculate the test statistic that would be used to test
whether there is a significant association between vitamin D and
PTH.
4) How many degrees of freedom will this test statistic have
under the null hypothesis? Enter your answer as a number only (do
not write "DF" as part of your answer).
5) Dr. Mueller is able to (correctly) calculate a p-value of
0.005. Draw a (one sentence) conclusion for her, relating back to
the context of the problem....
3. [25 marks] Some female psychology students were investigating
whether intelligence depends on brain size. They each took a
standard test that measured verbal IQ and also underwent an MRI
scan to measure their brain size. The resulting data is below, file
named IQBrain.csv.
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132
816.932
132
951.545
90
928.799
136
991.305
90
854.258
129
833.868
120
856.472
100
878.897
71
865.363
132
852.244
112
808.02
129
790.619
86
831.772
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798.612
83
793.549
126
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Interpret the result in APA stat
(1a) Is there a statistically significant difference in
academic performance in 2000 according to the socioeconomic
standing of the school as measured by the percentage of students
that receive free meals? Explain.
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(1b) Is there a statistically significant difference in
academic performance in 1999 between year-round and non-year-round
schools? How do you know? Explain?
Independent t test
(1c) Determine if...
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