Posted by Adria on Tuesday, December 8, 2009 at 8:55am.
A distribution with a mean of 200 units, a standard deviation of 40 units, a minimum value of 4 units and a maximum value of 245 units is
A. Positively skewed
B. Negatively skewed
C. "Bellshaped"
D. Bimodal

college Statistics  PsyDAG, Tuesday, December 8, 2009 at 10:12am
The value of 4 is much further from the mean than 245, especially in terms of standard deviations (1+ vs. almost 5 respectively). It would be negatively skewed (many scores at the high end, relatively few at the low end).

college Statistics  Adria, Tuesday, December 8, 2009 at 12:56pm
Thank You! I really appreciate you taking the time to answer my questions.

college Statistics  Adria, Tuesday, December 8, 2009 at 1:01pm
With the same mean and st.deviation, but a min of 55 and a max of 330, what would that be? I just need another example explained...thanks.

college Statistics  PsyDAG, Wednesday, December 9, 2009 at 2:05pm
Figure how many standard deviations (SDs) above and below the mean each extreme is. If they are approximately equal, it is "bellshaped." If one is significantly further away in terms of SDs, it is skewed in that direction. (You have to decide what is significant.)
There is insufficient data to suggest bimodal.
I hope this helps a little more.
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