Ch. 3

Question 1

MEAN

Question 2

MEAN OF THE VALUES IN A POPULATION

(THE PARAMETER)

Question 3

MODE

Answer 3

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

Question 4

Midrange

Answer 4

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.

Question 5

MEAN FROM A FREQUENCY DISTRIBUTION

Question 6

Median

Answer 6

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

Question 7

Range

Answer 7

range= [maximum] - [minimum]

Question 8

Standard Deviation

Answer 8

Sx in calculator

Question 9

Population Standard Deviation

Question 10

Varience

Answer 10

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

Question 11

Range Rule of Thumb

Answer 11

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

Question 12

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

Question 13

Chebyshev’s Theorem

Answer 13

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