1-tailed 2-tailed. 05 +/- 1.64 +/- 1.96.01 +/- 2.33 +/- 2.57 σ2 m = σ2/N Z = (M – μm) / σ m Z = (x – μ) / σ
d = (μ1- μ2)/σ
Students who don’t sleep well
Students who do sleep well
Students at Maryville
Students who receive good grades
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μ1 < μ2
μ1 = μ2
M1 > M2
μ1 > μ2
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Since 1.42 < 1.96, reject the null
Since 1.96 > 1.42, reject the null
Since 1.42 < 1.64, accept the null
Since -1.42 < 1.64, accept the null
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Null Distribution
Population 1
Comparison Distribution
Kurtotic Distribution
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A two-tailed test, because he wants to see if they increase reading speed and lower their time to read a book
A one-tailed test in the positive end, because he wants to see if people increase their words per minute reading speed
A one-tailed test in the negative end, because he wants to see if people take less time to read their book
It can be either.
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2.5
5
2
5.2
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.33
1
3.5
1.3
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4.35, 5.65
1.08, 8.92
6.35, 7.65
3.08, 10.92
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Type III
Type B
Type II
Type I
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D = -.21; negative effect
D = .21; medium effect
D = .21; small effect
D = -.21; small effect
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The probability that the study will give a significant result if the research hypothesis is false
The probability that the study will give a significant result if the research hypothesis is true
How powerful a study's effect size is
The probability of making a Type I Error
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The Mean of the Distribution of Means
The Standard Error
The Sample Mean
The Median
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