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Question :
1)The ordinary average of a group of numbers the
A)median.
B)mean.
C)standard deviation.
D)mode.
2)Based : 1991687

1)The ordinary average of a group of numbers is the

A)median.

B)mean.

C)standard deviation.

D)mode.

2)Based on the scores 1, 9, 3, 6, 1, 2, 6, 2, 2, and 8, a score of 4 is the

A)mode.

B)median.

C)mean.

D)standard deviation.

3)Based on the scores 1, 9, 3, 6, 1, 2, 6, 2, 2, and 8, a score of 2 is the

A)mode.

B)median.

C)mean.

D)standard deviation.

4)The correct formula for the mean is

A)*M* = Σ*X* / *N*

B)*M* = Σ*X*^{2} / *N*

C)*M* = (Σ*X*)^{2} / *N*

D)*M* = Σ(*X*−*M*)^{2} / *N*

5)The correct description of the mean is

A)the sum of the scores that is most frequent in a distribution.

B)the middle score if all the scores are ordered from lowest to highest.

C)the average of the squared deviations from the median.

D)the sum of the scores divided by the number of scores.

6)In statistical formulas, *N* stands for

A)the number of different values for a variable.

B)the number of scores.

C)the normal curve.

D)the normalized *Z* score.

7)The Σ*X* for the scores 1, 1, 8, and 10 is

A)4

B)4.5

C)5

D)20

8)A psychologist studying the rate at which infants in three different countries vocalized distress obtained the scores below from each country. Which group of infants showed the highest mean rate of distress vocalization?

Country A9, 9, 10, 13, 8, 8, 11, 11, 10, 7

Country B15, 15, 16, 9, 14, 14, 17, 17, 16, 13

Country C4, 6, 20, 17, 15, 21, 18, 18, 25, 2

A)Country A

B)Country B

C)Country C

D)Countries B and C were equally high.

9)The most common single value in a group of scores is the

A)mode.

B)mean.

C)median.

D)average.

10)The mode of the following scores 3, 4, 6, 7, 10, 10, and 30 is

A)3

B)7

C)8.5

D

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