If the mean is 100 and the standard deviation is 15, then 2 sd from the mean is 100 + 15 + 15 a mark of ... to the right of the mean and a mark that much to the left of the mean.
The z-score refers to the percent of the data that lies to the left of the mark you are seeking.
Question: If a distribution has a mean of 100 and a standard deviation of 15, what value would be +2 standard deviations from the mean?
How would you go about solving this? Find the z-score of 2? I know that 95% (if i'm not mistaken) covers 2 standard deviations.
2 answers
Probably the most useful applet for statistics, just enter
mean=100
sd = 15
2 standard deviations would put you at 130
click either above or below after entering 130
http://davidmlane.com/normal.html
mean=100
sd = 15
2 standard deviations would put you at 130
click either above or below after entering 130
http://davidmlane.com/normal.html