Telegram group: T.me/BBCNOUN
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EDU821
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1. Calculate the standard deviation of the scores presented in the table.

	      (a) 3. 81

	--->> (b) 3.55

	      (c) 3.00

	      (d) 3. 25

2. Calculate Σ(x-x ̅)

	      (a) 70

	      (b) 88

	      (c) 158

	--->> (d) 0

3. One of these is NOT a condition for using the Pearson product moment correlation.

	      (a) The two variables correlated are continuous

	      (b) The scores are obtained in independent pairs

	--->> (c) The scale used to obtain scores are ratio or interval

	      (d) The scatter gram are homoscedastic

4. What is the value of x Ì… ( in the table)

	      (a) 9

	--->> (b) 10

	      (c)  8.5

	      (d) 7.2

5. List the values in column  (x-x Ì…)2

	      (a)  -25,    -16, -1, 0, 1, 9, 36

	      (b)   5, 4, 1, 0, -1, -3, -6

	--->> (c)  25, 16, 1, 0, 1, 9, 36

	      (d)  15, 14, 10, 0, 11, 7, 4

6. The science which specializes in organizing and summarizing generated information for decision making is _______

	      (a) Informatics

	      (b) Information and communication technology

	--->> Statistics

	      Cybernetics

7. List the values in column  x-x Ì…

	      (a) 25, 16, 1, 0, 1, 9 , 36,

	--->> (b) 5, 4, 1, 0, -1, -3, -6

	      (c) 5, 4, 1, 0, 1, 3, 6

	      (d) 25, 16, 1, 0, -1, -9, -36

8. Parameters describe numerical properties of

	      (a) Sample

	--->> (b) Population

	      (c) Estimates

	      (d) Statistics

9. Using the values in the table determine S2 (variance)n

	      (a)  13

	      (b) 3.5

	      (c) 8.2

	--->> (d) 12.57

10. what is  the formula for the standard deviation of the scores?

	--->> Sd    =  √s2

	      (b) Sd    =  Σ(x-x ̅)2n                      Nn

	      (c) Sd    =    (s2) 2

	      (d)  Sd  =     (x Ì…)2