Introduction to Probability and Statistics
14th Edition
ISBN: 9781133103752
Author: Mendenhall, William
Publisher: Cengage Learning
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The owner of a new car conducts a series of six gas mileage tests and obtains the following results, expressed in miles per gallon: 3., 22.7, 21.4, 20.6, and 21.4. 20.9. Find the mode for these data.
Penicillin is produced by the Penicillium fungus, which is grown in a broth whose sugar content must be carefully controlled. Several samples of broth were taken on three successive days, and the amount of dissolved sugars, in milligrams per milliliter, was measured on each sample. The results were as follows.
Day
1
:
5.2
5.5
5.1
4.9
5.3
5.0
5.2
5.1
5.4
5.2
4.8
5.1
5.4
Day
2
:
5.8
5.1
5.3
5.5
5.2
4.9
5.4
5.0
5.4
5.0
5.6
5.4
5.6
Day
3
:
5.9
4.9
5.2
5.3
5.1
5.4
5.3
5.8
5.5
5.4
5.4
5.4
5.2
Can you conclude that the mean sugar concentration differs among the three days? Use the
=α0.05
level of significance and the ANOVA table shown below.
One-way ANOVA: Sugar Concentration
Source
DF
SS
MS
F
P
Days
2
0.2851
0.1426
2.3135
0.1134
Error
36
2.2185
0.0616…
A sociologist wants to determine if the life expectancy of people in Africa is less than
the life expectancy of people in Asia. The data obtained is shown in the table below.
Africa
Asia
= 63.3 yr.
1
X,=65.2 yr.
2
o, = 9.1 yr.
= 7.3 yr.
n1
= 120
= 150
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