Data Analyis Chapters 12-13
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Mean | average of numbers added together and divided
interval
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| median | arrange numbers in order the number the middle number is the median for odd, for even add two middle numbers divided by 2 ordinal
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| mode | the number that repeats itself, if no number repeats then there is no mode.ordinal nominal
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| range | simply the difference between the highest and lowest scores
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| quartile deviation | one half of the difference between the upper quartile and the lower quartile.
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| variance | defined as the amount of spread among scores.
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| standard deviation | square root of the variance of a set of scores.
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| normal curve | small # of a's and f's more b's and d's and lots of c's
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| skewed distributions | distribution is not normal it is said to be skewed.
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| percentile rank | percentage of scores that fall at or below a given score.
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| standard scores | calculation that expresses how far an individual student's test score is from the mean
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| z score | most basic and most used standard score. how far a score is from the mean. z score = 0
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| t score | used to proved an easier to understand score that is standardized without pluses or minuses and is derived by multiplying the z score by 10 and adding 50
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| Pearson r coefficient (for interval and ratio data) | correlation coefficient is the most propriate measure when the variables to be correlated are expressed as either interval or ration data.
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| Spearman Rho | correlate ranked or ordinal data
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| stanines | standard scores that divide a distribution into nine parts.
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| Frequencies | frequency at which data is collected at regular intervals. This often refers to whatever time of the day or the year in any given length of period.
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| type I error |
reject the null hypothesis when the null hypothesis is true
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| type II error |
accept the null hypothesis when the null hypothesis is false
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| Hypothesis | an explanation for the occurrence of certain behaviors, phenomena, or events; a prediction of research findings.
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Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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