Student's Solutions Manual To Accompany Elementary Statistics Tenth Edition
10th Edition
ISBN: 9780321470409
Author: Milton Loyer, Mario F. Triola
Publisher: PEARSON
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Chapter 8.3, Problem 31BB
Finding Critical t Values When finding critical values, we often need significance levels other than those available in Table A-3. Some computer programs approximate critical t values by calculating
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Find the z-score corresponding to the given value and use the z-score to determine whether the value is significantly low or high. Consider a score to be significantly low if its z-score is less than or equal to -2. Consider a z-score to be significantly high if it is greater than or equal to 2. Round the z-score to the nearest tenth if necessary.
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A paper gives data on x = change in Body Mass Index (BMI, in kilograms/meter?) and y = change in a measure of depression for patients suffering from depression who participated in a pulmonary rehabilitation program. The table below contains a subset of the data given in the paper and are
approximate values read from a scatterplot in the paper.
BMI Change (kg/m²)
0.5
-0.5
0.1
0.7 0.8
1
1.5
1.2 1
0.4
0.4
Depression Score Change
-1
4
4
5
8
13
14
17
18
12
14
The accompanying computer output is from Minitab.
Fitted Line Plot
Depression score change = 6.512 + 5.472 BMI change
5.26270
20-
R-Sq
R-Sq (adj) 19.88%
27.16%
15-
10-
5-
0-
-0.5
0.0
0.5
1.0
1.5
BMI change
R-są
5.26270
27.16%
Coefficients
Term
Coef
SE Coef
T-Value
P-Value
VIF
6.512
5.472
Constant
2.26
2.88
0.0164
BMI change
2.83
1.93
0.0823
1.00
Regression Equation
Depression score change = 6.512 + 5.472 BMI change
(a) What percentage of observed variation in depression score change can be explained by the simple linear regression…
Chapter 8 Solutions
Student's Solutions Manual To Accompany Elementary Statistics Tenth Edition
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In Exercises...Ch. 8.2 - Testing Claims About Proportions. In Exercises...Ch. 8.2 - Testing Claims About Proportions. In Exercises...Ch. 8.2 - Testing Claims About Proportions. In Exercises...Ch. 8.2 - Testing Claims About Proportions. In Exercises...Ch. 8.2 - Testing Claims About Proportions. In Exercises...Ch. 8.2 - Testing Claims About Proportions. In Exercises...Ch. 8.2 - Testing Claims About Proportions. In Exercises...Ch. 8.2 - Exact Method For each of the three different...Ch. 8.2 - Using Confidence Intervals to Test Hypotheses When...Ch. 8.2 - Power For a hypothesis test with a specified...Ch. 8.3 - Video Games: Checking Requirements Twelve...Ch. 8.3 - df If we are using the sample data from Exercise 1...Ch. 8.3 - t Test Exercise 2 refers to a t test. What is a t...Ch. 8.3 - Confidence Interval Assume that we will use the...Ch. 8.3 - Finding P-values. In Exercises 5-8, either use...Ch. 8.3 - Finding P-values. In Exercises 5-8, either use...Ch. 8.3 - Finding P-values. 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