Test III Flashcards
What occurs when the mean, median, and mode are all equal in a specific data set?
-equal dispersion of the distribution curve
68% is associated with what in parametric test?
1 standard deviation
95% is associated with what , in a parametric test?
2 standard deviations
99% is associated with what, in a parametric test?
3 standard deviations
What does a positively skewed graph look like, and how can you determine it based on mean and median?
- graph has a tail to the right, peak on the left.
- the mean is greater than the median.
What does a negatively skewed graph look like and what is the relationship between the mean and median?
- graph has a tail to the left, with the peak on the right
- the mean is less than the median
Define skewness
- measure of the asymmetry of a distribution.
- perfectly distributed data has a skew of 0.
What does a skew greater than 0 represent?
-skew to the right.(positive skew)
If the skew is less than 0 what does this represent?
-a skew to the left, (negative skew)
What ways can we determine the distribution of the data that was collected for the study?
- skewness
- graphically
- numerically with mean compared to median
- kurtosis
Kurtosis explains what about data?
-measures how closely associated the gathered data is focused around the mean
A normal kurtosis value should be what, even though it may never happen?
0
A positive kurtosis value explains what about the graph?
- stronger cluster of the data around the mean.
A more negative kurtosis value indicates what about the data that was collected?
- a weak cluster/associated of data around the mean.
What is a discrete unit or piece of data?
- something that has a finite number.
- -persons, cars, as they can’t be separated an counted as half
