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### 19 Cards in this Set

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