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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.