Elementary Statistics: A Step By Step Approach
10th Edition
ISBN: 9781259755330
Author: Allan G. Bluman
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 2.2, Problem 9E
Air Pollution One of the air pollutants that is measured in selected cities is sulfur dioxide. This pollutant occurs when fossil fuels are burned. This pollutant is measured in micrograms per cubic meter (μg/m3). The results obtained from a sample of 24 cities are shown in the frequency distributions. One sample was taken recently, and the other sample of the same cities was taken
| Class limits | Frequency (now) | Frequency (5 years ago) |
| 10–14 15–19 20–24 25–29 30–34 35–39 40–44 45–49 |
6 4 3 2 5 1 2 1 |
5 4 2 3 6 2 1 1 |
| Total 24 | Total 24 |
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9.2 Testing the Mean mu:
Problem 3
(1 point)
Test the claim that the population of sophomore college
students has a mean grade point average greater than 2.2.
Sample statistics include n = 71, x = 2.44, and s = 0.9.
Use a significance level of a = 0.01.
The test statistic is
The P-Value is between :
The final conclusion is
< P-value <
A. There is sufficient evidence to support the claim that
the mean grade point average is greater than 2.2.
○ B. There is not sufficient evidence to support the claim
that the mean grade point average is greater than 2.2.
Note: You can earn partial credit on this problem.
Note: You are in the Reduced Scoring Period. All work counts for
50% of the original.
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Oli
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There are four white, fourteen blue and five green marbles in a bag. A marble is selected from the bag without looking. Find the odds of the following:
The odds against selecting a green marble.
The odds in favour of not selecting a green marble
The odds in favor of the marble selected being either a white or a blue marble.
What is true about the above odds? Explain
Please show as much work as possible to clearly show the steps you used to find each solution. If you plan to use a calculator, please be sure to clearly indicate your strategy.
1. The probability of a soccer game in a particular league going into overtime is 0.125. Find the following:
a. The odds in favour of a game going into overtime.
b. The odds in favour of a game not going into overtime.
c. If the teams in the league play 100 games in a season, about how many games would you expect to go into overtime?
Chapter 2 Solutions
Elementary Statistics: A Step By Step Approach
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