1. Assignment: Read Chapter 23 Do exercises 1, 2, 5
Statistic for the day: Weight of the official disc used in ultimate: 175 grams
Assignment:
Read Chapter 23
Do exercises 1, 2, 5
These slides were created by Tom Hettmansperger and in some cases modified by David Hunter

2. Phone Women Men median 100 60 mean 150 91 SD 178 111 sample size 127
Research Hypothesis: In stat100, women spend more time
on the phone than men.
Women
Men
median
100 60
mean
150 91 SD
178
111
sample size
127 96
p-value
(2-sided)
.003
Conclusion: Support the research advocate. There is strong evidence that women spend more time on the phone than men on average.

3. Women Men median 100 60 mean 150 91 SD 178 111 sample size 127 96 SEM
How to compute the p-value:
Women
Men
median
100 60
mean
150 91 SD
178
111
sample size
127 96
SEM
15.8
11.4
SD of diff
sqrt( ) = 19.5
Test Statistic = (150 – 91)/19.5 = 3.03
Look up 3.03 in normal table (3.00 is close)
1-sided p-value is 1 minus the entry, i.e. 1−.9987 = .0013
2-sided p-value is double the 1-sided p-value or .0026

4. Remember these steps! State the alternative and null hypotheses.
Collect and summarize data and compute the test statistic.
Find the p-value.
Decide whether the data supports the alternative hypothesis.
Research question: Do males and females in Stat 100 differ with respect to average __________?
Variable Sex N Mean StDev SE Mean
Credits Female
Male
Fastcar Female
Male
Cigpacks Female
Male

5. Remember these steps! Yellow .14 Blue .24 Green .16 Brown .13 Red
State the alternative and null hypotheses.
Collect and summarize data and compute the test statistic.
Find the p-value.
Decide whether the data supports the alternative hypothesis.
Research question: Do ______ M&M’s really occur in the proportion claimed on the M&M’s website?
Yellow
.14
Blue
.24
Green
.16
Brown
.13
Red
Orange
.20

6. Remember these steps! Color Claimed Count in sample Yellow .14 783
State the alternative and null hypotheses.
Collect and summarize data and compute the test statistic.
Find the p-value.
Decide whether the data supports the alternative hypothesis.
Research question: Do ______ M&M’s really occur in the proportion claimed on the M&M’s website?
Color
Claimed
Count in sample
Yellow
.14
783
Blue
.24
1280
Green
.16
803
(Counts come from a representative sample of size 5533.)