final stat exam

• * To judge the reliability of measures of central tendency

• * To control variability itself.

• * To compare two or more groups of numbers in terms of their variability.

• * To make further statistical analysis.

those objective is for _______________

• measuring Variation

• Measures of Dispersion

• All

• None

____________ measures

of dispersions are a ratio or percentage of a measure

• Relative

• absolute

• All

• None

__________ is the largest score minus the smallest score.

• Standard deviation

• The range

• Mean deviation

__________ of a set of items is defined as the arithmetic mean of the

values of the absolute deviations from a given average.

• relative range

• Quartile deviation

• mean deviation

the symbol shows _____________

• Standard Deviation

• Mean Deviation

Which of the following correct sequence steps was used to calculate the sample variance?

I. Find the arithmetic mean.

II. Find the difference between each observation and the mean.

III. Square these differences.

IV. Since the data is a sample, divide the number by the

number of observations minus one.

V. Sum the squared differences.

• I,II,V,IV,III

• I,II,III,V,IV

• I,II,IV,V,III

Find the variance and standard deviation of the following sample data

(5, 17, 12, 10)

• 11

• 11.5

• 15

• 15.5

The following are the number of visit made by ten mothers to the local

doctor’s surgery. ( 8, 6, 5, 5, 7, 4, 5, 9, 7, 4). Find mean deviation about mean,

• mean deviation = 5

• mean deviation = 5.5

• mean deviation = 6

Find the relative range of the distribution. (32 35 36 36 37 38 40 42 42 43 43 45).

• 16

• 4

• 10

• 5

__________are measures that divide the frequency distribution into

hundred equal parts.

• Deciles

• quartile

• Percentiles