Statistics 101 Exam- Chapter 2 –
Straighterline |Questions solved 100%
Correct/Verified Solutions
Variance - ANSWER The arithmetic mean of the squared deviations of the observations from
the mean.
Mean Deviation - ANSWER The arithmetic mean of the absolute values of the deviation of
each observation from the arithmetic mean.
Standard deviation - ANSWER The last measure of dispersion you look at. It is the square root
of the variance.
Theorem - ANSWER For any population or sample, the percentage of values that lie within
k plus and minus standard deviations of the mean is at least
Emperical Rule - ANSWER 68% of all data is within one standard deviations of the
mean 95% of all data is within two standard deviations of the mean 99.7% of all data is
within three standard deviations of the mean
Deviation - ANSWER The difference between two items.
Maximum - ANSWER The highest level in a distribution
Minimum - ANSWER The lowest value in a distribution
Outlier - ANSWER A value that is either much larger or much smaller than the rest of the data.
Mode - ANSWER The value of an observation that occurs most frequently.
Straighterline |Questions solved 100%
Correct/Verified Solutions
Variance - ANSWER The arithmetic mean of the squared deviations of the observations from
the mean.
Mean Deviation - ANSWER The arithmetic mean of the absolute values of the deviation of
each observation from the arithmetic mean.
Standard deviation - ANSWER The last measure of dispersion you look at. It is the square root
of the variance.
Theorem - ANSWER For any population or sample, the percentage of values that lie within
k plus and minus standard deviations of the mean is at least
Emperical Rule - ANSWER 68% of all data is within one standard deviations of the
mean 95% of all data is within two standard deviations of the mean 99.7% of all data is
within three standard deviations of the mean
Deviation - ANSWER The difference between two items.
Maximum - ANSWER The highest level in a distribution
Minimum - ANSWER The lowest value in a distribution
Outlier - ANSWER A value that is either much larger or much smaller than the rest of the data.
Mode - ANSWER The value of an observation that occurs most frequently.
