Correlation: Point Biserial Model
Autor: nadinecc12 • June 12, 2019 • Essay • 415 Words (2 Pages) • 1,412 Views
[1] -- Saturday, February 02, 2019 -- 14:46:34
t tests - Correlation: Point biserial model
Analysis: A priori: Compute required sample size
Input: Tail(s) = One
Effect size |ρ| = 0.5
α err prob = 0.05
Power (1-β err prob) = 0.8
Output: Noncentrality parameter δ = 2.6457513
Critical t = 1.7291328
Df = 19
Total sample size = 21
Actual power = 0.8172279
[2] -- Saturday, February 02, 2019 -- 14:46:44
t tests - Means: Difference between two independent means (two groups)
Analysis: A priori: Compute required sample size
Input: Tail(s) = One
Effect size d = 0.5
α err prob = 0.05
Power (1-β err prob) = 0.95
Allocation ratio N2/N1 = 1
Output: Noncentrality parameter δ = 3.3166248
Critical t = 1.6536580
Df = 174
Sample size group 1 = 88
Sample size group 2 = 88
Total sample size = 176
Actual power = 0.9514254
t tests - Means: Difference between two independent means (two groups)
Analysis: A priori: Compute required sample size
Input: Tail(s) = Two
Effect size d = 0.5
α err prob = 0.05
Power (1-β err prob) = 0.80
Allocation ratio N2/N1 = 1
Output: Noncentrality parameter δ = 2.8284271
Critical t = 1.9789706
Df = 126
Sample size group 1 = 64
Sample size group 2 = 64
Total sample size = 128
Actual power = 0.8014596
[6] -- Saturday, February 02, 2019 -- 15:58:47
t tests - Means: Difference between two independent means (two groups)
Analysis: A priori: Compute required sample size
Input: Tail(s) = Two
Effect size d = 0.5
α err prob = 0.05
Power (1-β err prob) = 0.8
Allocation ratio N2/N1 = 1
Output: Noncentrality parameter δ = 2.8284271
Critical t = 1.9789706
Df = 126
Sample size group 1 = 64
Sample size group 2 = 64
Total sample size = 128
Actual power = 0.8014596
[7] -- Saturday, February 02, 2019 -- 15:58:50
t tests - Means: Difference between two independent means (two groups)
Analysis: A priori: Compute required sample size
Input: Tail(s) = Two
Effect size d = 0.5
α err prob = 0.05
Power (1-β err prob) = 0.80
Allocation ratio N2/N1 = 1
Output: Noncentrality parameter δ = 2.8284271
Critical t = 1.9789706
Df = 126
Sample size group 1 = 64
Sample size group 2 = 64
Total sample size = 128
Actual power = 0.8014596
[8] -- Saturday, February 02, 2019 -- 15:58:53
t tests -
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