Ch. 3 Flashcards Preview

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Flashcards in Ch. 3 Deck (14)
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1
Q

MEAN

A
2
Q

MEAN OF THE VALUES IN A POPULATION

(THE PARAMETER)

A
3
Q

MODE

A

the mode of the data is the value that occurs WITH THE GREATEST FREQUENCY

4
Q

Midrange

A

the midrange is the measure of center that is THE VALUES MIDWAY BETWEEN THE MAXIMUM AND MINIMUM VALUES in the original data set. It is found by adding the maximum data value to the minimym data value and then diviiding the sum by 2.

5
Q

MEAN FROM A FREQUENCY DISTRIBUTION

A
6
Q

Median

A

measure of the center that is the middle value when the original data values is arranged in order of increasing or decreasing magnitude.

X TILDE

Med in calculator

7
Q

Range

A

range= [maximum] - [minimum]

8
Q

Standard Deviation

A

Sx in calculator

9
Q

Population Standard Deviation

A
10
Q

Varience

A

is a measure of varience equal to the square of the standard deviation

11
Q

Range Rule of Thumb

A

minimum “usual” value = (mean) - 2(standard deviation)

maximum “usual” value = (mean) + 2(standard deviation)

to calculate standard deviation from set of data use:

s= range/ 4

12
Q

Empirical (68-95-99.7) Rule for Data with Bell-Shaped (normal) Distribution

A
13
Q

Chebyshev’s Theorem

A

the proportion (or fraction) of any set of data within K standard deviations of the mean at least:

where K is any positive number greater than 1.

AT LEAST 3/4 (76%) LIE WITHIN 2 STANDARD VARIATIONS OF THE MEAN

AT LEAST 8/9 (89%) LIE WITHIN 3 STANDARD VARIATIONS OF THE MEAN

14
Q
A