st
does the data have an outlier, if it exists what is it, and how do we deal with it
yes, 59, double check data looking for error, kick it out of data set
construct a stem plot
show me
what is the relative frequency for a data value in the 40's
3/29 or 0.1 oe 10%
If you construct a histogram for the data what is the 1st interval width and central point
9.95-19.95
15
Which bar is tallest and what is it's frequency
3rd bar 29.95-39.95
13
which better fits the data histogram or bar graph, why
histogram
continuous data
Another poll asking do you own a sedan, coupe or a convertible. Better fit for data is histogram or bar graph, why.
bar graph
categorical data
median =
31
Q1=
25
Q3=
37
use the box plot median =
67
use the box plot Q1= Q3=
60
73
use the box plot IQR=
13
use the box plot range =
24
median class test score is 85 you scored 80 interpret your score compared to the class
since you are below the median more than 50% of the class scored higher than you did
mean =
30.4
if the mean is 30.4 and median is 31 which better represents the center of the data
median
is the data skewed left, right, or symmetrical
left (slightly)
When the mode = the median = the mean, how would you describe the distribution
symmetrical
standard deviation =
7.5
what value is 2 standard deviations below the mean
15.4
find the z-score for 26 mpg
-0.6
40th percentile =
28
26 mpg = what percentile
34th percentile
You make a mobile order at Mcdonalds and check in and wait 4 minutes for your order. If that wait time was in the 17 percentile. explain what it means and declare it good or bad.
17 % of customers got their order before you but 83 % got their order after you did so that would be considered a good wait time