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Write in your own words about following:
· When and how to use mean, median, and mode.
· Determining skewness from mean and median
· The concept of variability and how to use it. 
· Range of distribution
· What is interquartile range of distribution how do you interpret it.
· How do you calculate standard deviation and variance for a grouped and ungrouped data?
Answer the following questions using the data Set 3-1 
A student was interested in the structure of the families in the U.S. He sampled 29 of his 330 classmates asking the question, “How many children are there in your family?” He compiled the answers into a simple frequency distribution:
X
7
5
4
3
2
1
f
1
2
3
6
10
7
1. What is the mean?
2. What should be the symbol of a mean calculated for these data?
3. What is the median?
4. What is the mode?
Chapter-4 Questions
Answer the following questions using the data set 4-2
5
3
9
7
6
5. What is the range? 
6. Compare the variability of the scores of 10, 11, 9, 10, 11, 9 with the variability of data set 4-2.
7. If you consider data set 4-2 to be a population, what is the standard deviation
8. What is the deviation score of the raw score of 7 in data set 4-2 

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