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Get Full Access to Statistics: Informed Decisions Using Data - 5 Edition - Chapter 7.2 - Problem 12
Get Full Access to Statistics: Informed Decisions Using Data - 5 Edition - Chapter 7.2 - Problem 12

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# ?In Problems 5–12, find the indicated areas. For each problem, be sure to draw a standard normal curve and shade the area that is to be found. Det ISBN: 9780134133539 240

## Solution for problem 12 Chapter 7.2

Statistics: Informed Decisions Using Data | 5th Edition

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Problem 12

In Problems 5–12, find the indicated areas. For each problem, be sure to draw a standard normal curve and shade the area that is to be found.

Determine the total area under the standard normal curve

(a) to the left of z = -2.94 or to the right of z = 2.94

(b) to the left of z = -1.68 or to the right of z = 3.05

(c) to the left of z = -0.88 or to the right of z = 1.23

Step-by-Step Solution:

Step 1 of 5) To draw a standard normal curve and shade the area that is to be found. Determine the total area under the standard normal curve (a) to the left of z = -2.94 or to the right of z = 2.94 (b) to the left of z = -1.68 or to the right of z = 3.05 (c) to the left of z = -0.88 or to the right of z = 1.23. The contradictory results of the regression output occur because both x1 and x2 are related to the response variable y, as indicated by the correlation matrix. However, x1 and x2 are also related to each other. So, with x1 in the model, x2 adds little explanation. Likewise, with x2 in the model, x1 adds little explanation. The solution is to use only one explanatory variable. Which explanatory variable we choose is up to us. We can choose either the explanatory variable with the lower P-value or the explanatory variable that has the higher correlation with the response.

Step 2 of 2

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Statistics: Informed Decisions Using Data : Testing the Significance of the Least-Squares Regression Model
?In Problems 5–10, use the results of Problems 7–12, respectively, from Section 4.2 to answer the following questions: (a) What are the estima

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