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stats for psych quiz 2

Terms in this set (6)

Dr. Smith is interested in whether or not students in his class perform better on a standardized exam than the national average. What type of statistic should he use to analyze the data he collected?
one sample t-test

this is used because he is comparing his students with a known value (the national average).
Dr. Jones is interested in whether people are happier after eating cookies or pizza. He has his subjects eat a cookie and then rate their happiness on a 1 to 10 scale. The next day he asks these same participants to eat a piece of pizza and rate their happiness. What type of statistic should Dr. Jones use to analyze his data?
Paired sample t-test

These are used within-subjects designs like this one
A researcher analyzed her data and found that her paired sample t-value was significant. How does she know what that means in terms of her data?
She needs to look at the descriptive statistics for the psychological relevance of the study.

The significant t-value tells you something meaningful happened. The descriptive statistics are used to determine what this means.
Rejecting the null hypothesis when the null hypothesis is true is known as a(n):
Type 1 error
A researcher is very concerned about making a Type 1 error. What can he do to lessen the likelihood of this occurring?
lower his alpha value
The traditional APA cutoff for determining significance is:
.05
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