1.Consider the Box whisker plot diagram for a set of data; x x 9 10 12 13 15 19

Question

1.Consider the Box whisker plot diagram for a set of data;

x x

9 10     12 13         15        19 20   22

                             Q1         Q2 Q3

a) The distribution is: i) skewed to the right ii) symmetric iii) skewed to the left (Circle one)

b) The value of the IQR =__________

c) Are there outliers: i) yes ii) no iii) if yes they are at _______ Circle between i) and ii)

2. The difference between Stratified sampling and Cluster sampling is that

3. Consider the set of scores whose mean is 2.6 and standard deviation (SD) s = 1.5 Find the corresponding scores if the scores are 2, -1, 0 and -2.5: Use the formula Z= (x-mean) / s

a) X1 = ______

b) X2 = ______

c) X3 = ______

d) X4 = _______

Explanation / Answer

1.

a.

The values of Q1 , Q2 and Q3 are on the right. So, the frequency is more on the right.
Hence, the distribution is skewed on the left

b. IQR = Q3-Q1 = 20-15=5

c. Yes. the one marked with x.:9 and 10

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