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Chapter 10

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on 7 November 2016

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Transcript of Chapter 10

Chapter 10
Question 33
A recent study revealed the typical American coffee drinker consumes an average of 3.1 cups per day. A sample of 12 senior citizens revealed they consumed the following amounts of coffee, reported in cups, yesterday.


At the .05 significance level, does the sample data suggest there is a difference between the national average and the sample mean from senior citizens?
Chapter 10
Question 33
Given data: find x-bar and s.
Chapter 10
Question 33
Step 1: State the Null and Alternate Hypotheses.
Chapter 10
Question 33
Step 2: Select the Level of Significance.
Chapter 10
One-Sample Tests of Hypothesis

2.6 2.6 3.1 3.1 3.1 3.2 3.3 3.5 3.8 4.1 4.3 4.4
Jose Fuentes
Laudy Calderon
Elizabeth Rodriguez
Chapter 10
Question 33
Step 3: Select the Test Statistic.
Since Population Standard deviation is unknown, we will use the t-distribution with n-1 (12-1=11) degrees of freedom.
Chapter 10
Question 33
Step 4: Formulate the Decision Rule
Natasha Vera
Jose Fuentes
Chapter 10
Question 33
Step 5: Make a Decision.
Since 1.85 is not less than -2.2 we do not reject H(0) at a significance level of 0.05.
Michael Cespedes
Chapter 10
Question 33
Step 6: Interpret the Result.
We have shown that the mean number of cups consumed by the typical American coffee drinker may indeed be 3.1 cups.
Lisa Puga
Chapter 10
Question 33
Decision Rule Using the P-Value.
By looking at the t-distribution table to find our zα, we can conclude that our p-value is between a 0.05 and 0.1 level of significance.
Sarah Rosen
3.1 3.3 3.5 2.6 2.6 4.3 4.4 3.8 3.1 4.1 3.1 3.2
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