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Stat Chapter 10
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Terms in this set (20)
Hawthorne effect
a positive change in the performance of a group of persons taking part in an experiment or study due to their perception of being singled out for special consideration
Type II Error
Fails to reject a null hypothesis that really is false
Power=
1-alpha
One can increase power by...
Increasing sample size
Decreasing the SD
Increasing alpha
When we reject a true null...
This is a type I error
When we fail to reject a false null....
This is a type II error
If the p-value is less than or equal to alpha
Reject the null
If the p-value is greater than alpha...
Fail to reject the null
P-value that is less than alpha
Statistically significant
When p-value falls in the critical region...
Reject the null
Alternative hypothesis
The effect we suspect is true
A type I error is committed if we...
Make an incorrect decision when the null hypothesis is true.
The hypothesis of most interest to the researcher is...
The null hypothesis
A Type II error is defined as...
Not rejecting a false null hypothesis
The probability of making a Type II error increases as the probability of making a Type I error______
decreases
The power of a test decreases as the level of significance _____.
decreases
If the p-value is less than alpha in a two-tailed test...
The null hypothesis should be rejected.
Z =
(Sample proportion - true proportion )/standard deviation
Finding the sample size: m=
Z* (SD/square root of n)
Calculating the confidence interval:
xbar + or - z*(SD/sq. root of n)
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