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Probability and Statistics, WGU C955/51 Questions and Answers
Probability and Statistics, WGU C955/51 Questions and Answers
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Probability and Statistics, WGUC955/51 Questions and Answers
Boxplot - -an image that has min, Q1, median, Q3, max
-Histogram - -A graphical representation -- bars, measuring the frequency
within each interval
-Skewed right - -Not a symmetric distribution, the tail is on the right, i.e.
extra stuff on the right
-Measures of center - -Median, the mean (and mode)
-Measures of spread - -Range, IQR & standard deviation
-Standard Deviation Rule - -68% of the data are within 1 standard deviation,
95% are within 2, 99.7 are within 3 standard deviations from the mean.
-For skewed data, use these for center and spread - -In this situation, we
use median (for center) & IQR (for spread)
-Explanatory variable - -In a study, what we think is the "cause"
-Response variable - -In a study, what we think is the "effect"
-Scatter plot - -A graphical representation of Q -> Q
-Two way table - -A graphical representation of C -> C
-Side-by side box - -A graphical representation of C -> Q
-Linear relationship - -"shaped like a line"
-Correlation coefficient, r - -Between -1 and 1; measures how close the
points are to the line and if the trend is uphill (positive) or downhill
(negative).
-r = -0.2, for example - -This is an example of a correlation coefficient that
represents a weak negative correlation.
-r = 0.9, for example - -This is an example of a correlation coefficient that
represents a strong positive correlation.
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