math 2: statistics

Question 1

measures of center summarize a data set using a single

Answer 1

typical value

Question 2

the mean x(with line over it) is

Answer 2

Σxi/n

Question 3

Σ indicates the

Answer 3

sum of the data values xI

Question 4

n is the

Answer 4

number of data values

Question 5

standard deviation formula

Answer 5

s = √1/(n-1)∑(xi - mean)^2

Question 6

the larger the standard deviation, the more spread out

Answer 6

a data set is

Question 7

z score, z =

Answer 7

(x - mean)/ s

Question 8

a z-score is the number of standard deviations s that a data value x is from the

Answer 8

mean

Question 9

the greater the value of absolute value z, the less common the

Answer 9

data value x is

Question 10

fewer data values have a

Answer 10

high z-score

Question 11

regression is a technique for analyzing the

Answer 11

relationship between two variables

Question 12

regression technique summarizes relationships such as mathematical equations in which two variables are denoted by

Answer 12

x and y

Question 13

linear regression model: y =

Answer 13

a0 + a1x

Question 14

quadratic regression model: y =

Answer 14

a0 + a1x + a2x^2

Question 15

exponential regression model y =

Answer 15

a0e^a1x