intro to stats

Question 1

IQR

Answer 1

interquartile range
q3-q1

Question 2

lower fence

Answer 2

q1 - [IQR*1.5]

Question 3

upper fence

Answer 3

q3 + [IQR*1.5]

Question 4

when adding outliers to a box plot…?

Answer 4

no min if left of min
no max if right of max

Question 5

uniform skew (mean)

Answer 5

sample mean = median

Question 6

skew to the right (mean)

Answer 6

sample mean > median

Question 7

skew to the left (mean)

Answer 7

sample mean < median

Question 8

positive skew

Answer 8

skew to the right

Question 9

right skew (box plot)

Answer 9

q3 - q2 > q2 - q1
right square will be larger than the left/right tail will be longer than the left

Question 10

left skew (box plot)

Answer 10

q3 - q1 < q2 - q1
*left square will be larger than the right/left tail will be longer than the right

Question 11

stem and leaf

Answer 11

ones place as the leaf, every other place as the stem
*always use a key

Question 12

frequency table

Answer 12

digit on the left column, times it appears on the right

Question 13

histogram

Answer 13

bar-graph-like
contains ranges and frequency of data points within the ranges

Question 14

relative frequency

Answer 14

the quotient of the frequency of each data point by the sum of the frequencies of all data points
rf = f/n
*relative frequencies of each data point in a set should all add up to one

Question 15

cumulative relative frequency

Answer 15

begins with the first RF and then adds the following RF to find the next CRF

Question 16

percentiles and CRFs

Answer 16

CRFs * 100 give percentiles
*the value to which a percentile corresponds to is where the percentile ends, larger percentiles correspond to the following value in the value column