Wk. 3 - measures of center/location, 5 # sum., boxplot

Mean of frequency table

Data = L1, Frequency = L2 stat - calc - 1-var - List=L1, Frequency=L2 - calculate w/data classes, use class midpoint ex. data= 5-8; midpoint = (5+8)/2 = 6.5 6.5 would be placed in L1 as the data value

lower fence

Q1 - 1.5 x IQR min. value that's not an outlier # < lower fence = outlier

upper fence

Q3 + 1.5(IQR) max. value that's not an outlier # > upper fence = outlier

IQR (interquartile range)

Q3-Q1

mean

average x bar (notation for sample mean) = sum of x /n sum of total values/# of values

5 # sum calculator

list values in L1 stat - calc - 1-var - List=L1, no frequency - calc

median

middle data value aka 50th percentile, 2nd Quartile

5 # summary

minimum, Q1, median/Q2, Q3, maximum

mode

most repeated data value bimodal - 2 modes multimodal - > 2 modes no modes - all values appear the same # of times

mhu =

population average

x bar =

sample average

Box Plot (Box and Whisker Plot) calc

2nd - statplot - plot 1 - boxplot graph - xlist = L1 - graph - zoom - 9 - trace

3rd Quartile/Q3/75th percentile

(max + median) / 2

midrange

(max value + min value) / 2

1st Quartile/Q2/25th percentile

(min. + median) / 2