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19 Cards in this Set
- Front
- Back
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Branch of mathematics used to analyze numbericla data and draw conclusions from that data
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Statistics
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The portion of the experiment that the researcher manipulates or varies
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Treatment
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A characteristic that changes over time, or from different individuals or objects under consideration
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Variable
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What are the two basic methods to present and summarize data collected during an experiment?
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Numerical and graphical
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Using the numerical approach, the reseacher calculates either a ____ or a ____.
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Parameter, Statistic
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A numerical Characteristic of a population
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Parameter
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A numerical characteristic of a sample
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Statistic
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Measure of central tendency. Is the sum of all the measurements divided by the number of measurements
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Mean
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Measure of how spread out a distribution is. Computed as the average squared deviation of each number from its mean.
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Variance
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Square Root of the variance. Most commonly used measure of spread.
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Standard Deviation
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Plot constructed from a frequency table; the intervals are shown on the x axis and the number of scores in each interval are represented on the y axis
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Histogram
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Hypothesis that states that the means for two or more populations or samples are not equal.
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Alternative Hypothesis
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Hypothesis that states that the means for two or more populations or samples are equal.
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Null Hypothesis
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Which hypothesis are we always testing?
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The null hypothesis
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The ____ hypothesis is always true until proven false.
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Null
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How do we decide whether to reject or accept a null hypothesis?
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We look at the P value
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P is what?
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The probability of rejecting a true null hypothesis
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If P is less than 5% then....
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We reject the null hypothesis. There is a significant difference in our means.
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If P is greater than 5% then...
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Accept the null hypothesis. There is not a significant difference in the means.
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