Q1) Chart below gives percentage of counties in US that use different methods for recording votes in 1980 & 2002. Set up side-by-side bar charts by year by using instruction for side-by-side charts in Class Notes Conference.
|
Method
|
1980
|
2002
|
|
Punch cards
|
18.5
|
15.5
|
|
Lever machines
|
36.7
|
10.6
|
|
Paper ballots
|
40.7
|
10.5
|
|
Optical scan
|
0.8
|
43
|
|
Electronic
|
0.2
|
16.3
|
|
Mixed
|
3.1
|
4.1
|
Q2) Following are sample of the weights of nine jars of peanut butter,
7.697.72 7.80 7.86 7.90 7.94 7.97 8.06 8.09
a) Calculate median weight.
b) Calculate standard deviation of the sample.
c) Use PHStat to make a box-whisker plot. If PHSTAT has yet to be installed, calculate Xmin, Xmax, Q1, Q3 and median using equation in Class Notes-Quartiles, Percentile & Dectiles.
d) Are there outliers? An outlier value is defined as usually large or small according to expression:
Outlier > Q3 + 1.5 (Q3 - Q1) or,
Outlier < Q1 - 1.5 (Q3 - Q1)