# Experimental Psychology Study Set 1

Psychology

## Quiz 17 :Statistical Reasoning: An Introduction

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The two properties about a set of measurements of a dependent variable that we are most interested in describing are
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C

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The ________________ is the sum of all the scores divided by the number of scores.
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B

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The generally preferred measure of central tendency is usually the
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B

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The mean is
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The ______________ divides a distribution in half.
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An advantage of the median over the mean is that the median is
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Which of the following is the most useful descriptive statistic for measuring dispersion?
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The standard deviation is
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All of the following statements are true of the normal distribution EXCEPT
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A score that lies one standard deviation above the mean
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If the mean I.Q. score is 100 and the standard deviation of I.Q. scores is 15, then an I.Q. of 130 will have a z-score (or standard score) of
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Inferential statistics allow you to decide whether a difference between the experimental and the control group is due to _______________ or ________________.
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The ___________ is the standard deviation of sample means.
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The null hypothesis suggests that the two samples come from ___________ distribution(s), and the experimental hypothesis suggests that the two samples come from _____________ distribution(s).
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In comparison with a confidence level of 0.05, a confidence level of 0.01 means
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Rejecting the null hypothesis when it is actually false is
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Failing to reject the null hypothesis when it is actually true is a
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Failing to reject the null hypothesis when it is actually false is a
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