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Practice Quiz 3 Answers
1.
T is 30
2.
z = .3333
proportion is .6293
Note: we can solve this problem because we know that intelligence has a normal
distribution.
3.
Standard error of the mean
4.
Sampling distribution should have the following properties
- be roughly normal in shape
- X axis labeled mean IQ
- Y axis labeled p or probability
- mean of 105
- standard deviation of 1.5 (15 / sqrt(100) = 15 / 10 = 1.5)
5.
Ho: Mu = 100
sigma x-bar = 15 / sqrt(225) = 15 / 15 = 1
z = (102 – 100) / 1 = 2
p = .0228
p < alpha so Reject
6.
P(Ho is true | Reject Ho) = cannot be determined
P(Retain Ho | Ho true) = 1 - alpha
P(Type 1 error) = cannot be determined
7.
If alpha increases, beta decreases
8.
If p is less than alpha, we reject Ho
9.
The symbol for power is 1 – beta (written in greek)
10.
p is the P(getting results like these or even more extreme than these given that Ho is true)