Please find the range, sample standard deviation and inter-quartile range (IQR) of the following data set.

38,49,62,79,83,87,88,93,93,94

range =(Please enter an exact answer.)standard deviation (s

s

) =(Please show your answer to one decimal place.)IQR =(Please enter an exact answer.)

A new number, 230, is added to the data set above. Please find the new range, sample standard deviation and IQR of the new data set.

range =(Please enter an exact answer.)standard deviation =(Please show your answer to one decimal place.)IQR =(Please enter an exact answer.)

Which measure of spread is less affected by the addition of the extreme observation?

• IQR
• standard deviation
• Range