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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For each of the following t
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4) How many degrees of freedom will this test statistic have
under the null hypothesis? Enter your answer as a number only (do
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129
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71
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132
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112
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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.
IQ
BrainV
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
90
798.612
83
793.549
126
866.662
126
857.782...
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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.
one-way anova
(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
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3. At test for two related samples Aa Aa A researcher is interested in how left-handedness is related to hemispheric specialization in the brain. She matches N 25 right-handed students with left-handed students on their cognitive abilities and hand-eye coordination and then asks them to identify letter strings flashed onto the right or left sides of a screen as either words or nonwords she then compares the two groups on the number of non words flashed onto the right side...
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