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1
INEN314 Homework #6
(
Due 10/17, No Late Homework will be accepted for this assignment
)
Problem 1 is related to your experiments in Lab#6.
You need to use the data collected from the Lab to
finish this homework.
1. [12 pts]
Using the typing time data you collect during Lab #6.
Approach 1.
1.
Calculate the sample mean and variance of typing time of typist A, denoted as
A
x
and
2
A
S
,
respectively.
Calculate the sample mean and variance of typing time of typist B, denoted as
B
x
and
2
B
S
, respectively.
2.
Calculate the difference between the average typing time between A and B, denoted as
B
A
x
−
.
3.
What is the pooled variance of the entire typing time data? (assume the variances of both persons are
the same, use the formula for
2
p
S
). Calculate the value, denoted as
2
total
S
.
4.
You want to conclude if the typing times for two typists are the same. Write down the hypothesis, H
0
and H
1
. Given
α
=0.05, conducted a ttest. What conclusion you can make in regard to the hypothesis
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This note was uploaded on 09/01/2011 for the course ISEN 314 taught by Professor M during the Spring '10 term at Texas A&M.
 Spring '10
 M

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