Unit 2 Flashcards
The probability that an investigator will correctly reject the null hypothesis when it is false is called the __ if the statistical test.
Power
A Z-score of 0 is equal to _________
The raw score mean
Traditionally, ______ is the probability associated with alpha.
.05
An implication of the central limit theorem is that the sampling distribution of the mean can be approximated by a ____ distribution when the sample size is sufficiently _____.
Normal; large
Rejecting the null hypothesis when you actually should have a significant result is _______.
Neither
Options type II error, type I error, Or both
As the sample size increases, the standard error of the mean ______, other things being equal.
Adding
Which of the following statements is an example of a two-tailed alternative hypothesis?
H1:μ1=\μ2
The___ the sample size, the ____ the statistical test will be, everything else being equal.
D. b and c
b. Smaller; less powerful
(c. Larger; more powerful)
Rather than attempt to select all possible random samples from a population, researchers select one sample, and use the sample data to ______ the population values.
Predict
Two-tailed alternative hypotheses do not indicate ________ in the prediction.
Direction
In hypothesis testing, if observations are unlikely to be due to chance, we ______ the null hypothesis.
Reject
An unbiased estimator is a statistic whose mean across all possible random samples of a given size equals the value of the _________ parameter
Population
Even when the shape of the underlying population is skewed, the sampling distribution of the mean approximated a _________ ____________when sample sizes are large enough.
Normal distribution
The standard deviation of a sampling distribution of the mean is called the _________ ____________ of the mean.
Standard Error
When a researcher states that an observed value will be higher than a comparison value, she must provide a _____ _____ alternative hypothesis.
One Tailed
