How do you explain the data of: The mean Index score in our samples was 57.04 (standard deviation = 12.13). Index scores were approximately normally distributed, ranging from 21 to 80 ( the 57.04...

How do you explain the data of: The mean Index score in our samples was 57.04 (standard deviation = 12.13). Index scores were approximately normally distributed, ranging from 21 to 80 ( the 57.04 is in rage of 21 to 80?)

What does this mean? Index scores were approximately normally distributed, ranging from 21 to 80

Here is the directions of computing the MQOL-HIV Index score.

of Summary Index A single summary measure for overall Quality of Life may be computed for the MQOLHIV using the following formula: MQOL-HIV INDEX = 2 * Mental Health domain score + Physical Functioning domain score This weighted index was derived from three global QOL indicators (Cantril's Ladder of Life, Campbell's Life Satisfaction item, and a visual analog scale). Higher Index scores represent better Quality of Life.

 

 

Expert Answers
steveschoen eNotes educator| Certified Educator

Well, you can use the information to describe the data.  Or, use the data to draw a normal curve, since you know the mean and standard deviation.

Now, actually, since these values are suppose to vary from 21 to 80 (midpoint 50.5), with a mean of 57.04, that would mean the data is skewed to the left a bit.

"Approximately normally distributed" means it can be approximated by a normal curve, like in the attachment.

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