Midterm 1

Question 1

median formula

Answer 1

.5(n+1) —> position

p + .5((p+1)-p)

Question 2

modes

Answer 2

there can be more than 1

Question 3

IQR resistant or sensitive ?

Answer 3

resistant to outliers, always

Question 4

in stem and leaf plot do you list reoccurring numbers

Answer 4

yes

Question 5

shape of distribution

Answer 5

shape
center
spread/outlier (observations close together –> small)

do outliers affect the shape ?

Question 6

standard deviation

Answer 6

s

Question 7

variance

Answer 7

s^2

Question 8

mean

Answer 8

x bar

Question 9

independent variable

Answer 9

x

Question 10

if b is negative, what does that mean for the slope ?

Answer 10

negative

Question 11

relationship between bivariate data

Answer 11

strength (r)
direction (b and r)
form (r^2h — grades)

Question 12

Q1

Answer 12

.25(n+1) –> position

Question 13

Q3

Answer 13

.75(n+1) —> position

Question 14

finding quartile from position

Answer 14

p+(.5)((p+1)-p)

Question 15

Determine outliers

Answer 15

Upper and Lower Fence

Question 16

upper and lower fence

Answer 16

Q1/3+-1.5IQR

Question 17

parameter owner needs

Answer 17

sample gained

Question 18

statistic

Answer 18

parameter for desired # of sample

Question 19

quantitative

Answer 19

math operation can be applied

Question 20

qualitative

Answer 20

classified according to a category

Question 21

discrete

Answer 21

finite

Question 22

continuous

Answer 22

infinite

Question 23

interval

Answer 23

quantitative

Question 24

nominal

Answer 24

qualitative (numerically meaningless)

Question 25

ordinal

Answer 25

qualitative (calculations have meaning)

Question 26

draw a pie chart without percentages

Answer 26

divide by the total

Question 27

class width

Answer 27

range/# of classes

Question 28

left inclusion

Answer 28

include # on left, lower boundary

Question 29

describe histogram

Answer 29

shape
center
spread
outliers

Question 30

median

Answer 30

list position

Question 31

3 stats that measure central location

Answer 31

mean
median
mode

Question 32

mean

Answer 32

average

Question 33

median

Answer 33

middle

half is this and half is that

Question 34

mode

Answer 34

what’s repeated

Question 35

variance

Answer 35

can’t be negative bc it’s a square of numbers

Question 36

emperical rule

Answer 36

68-95-99.7

Question 37

chebyshev

Answer 37

x bar + ks

at least # of the obsefcatiks fall into this number set

Question 38

(1-1/k^2)100

Answer 38

obvs will fall into x bar + ks

Question 39

1/k^2

Answer 39

will not fall into x bar+ ks

Question 40

covariance

Answer 40

Sxy/n-1

tells you direction based of negative or positive

Question 41

correlation coefficient

Answer 41

r
>0 positive
<0 negative
r >= .8 strong 
.6

Question 42

coefficient of determination

Answer 42

r^2

“grades”

Question 43

a

Answer 43

when x equal 0 this still happens “a” times