Reference no: EM131294067
t-test statistics (Chapter 10)
Use the following data to answer questions 1-6
An elementary school nurse is looking for ways to increase the amount of time students spend washing their hands after using the bathroom. In order to encourage hand washing she posts a sign in the boys' bathroom that says "Remember to wash your hands." In a second (girls') bathroom she posts the same sign but also includes pictures of hand washing.
The scores shown represent the number of seconds that students spend washing their hands.
Sign Only
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Sign and pictures
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8
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12
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6
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12
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4
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6
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6
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10
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1)What type of t-test does this represent?
2)What is df for this test?
3)If we use a 2-tailed test with a = .05, what is the critical t-value?
4)if we use a 1-tailed test with alpha = .01, what is the critical t-value?
5)Calculate the t-test score using the correct formula.
6)Can we conclude that using a sign with pictures is more effective than a sign with words alone? Explain.
7. In a sample with n = 10, what is the critical t table score for a 2 directional test with a = .05?
8. In a sample with n = 25, what is the critical t table core for a one directional test with a =.05?
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