Elementary Statistics (13th Edition)
13th Edition
ISBN: 9780134462455
Author: Mario F. Triola
Publisher: PEARSON
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Textbook Question
Chapter 10.3, Problem 2BSC
Prediction Interval Using the heights and weights described in Exercise 1, a height of 180 cm is used to find that the predicted weight is 91.3 kg, and the 95% prediction interval is (59.0 kg, 123.6 kg). Write a statement that interprets that prediction interval. What is the major advantage of using a prediction interval instead of simply using the predicted weight of 91.3 kg? Why is the terminology of prediction interval used instead of confidence interval?
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Chapter 9, Section 3, Exercise 059
Two intervals are given, A and B, for the same value of the explanatory variable.
A: 84 to 106;
B: 91 to 99;
(a) Which interval is the confidence interval for the mean response?
A or B
Which interval is the prediction interval for the response?
A or B
(b) What is the predicted value of the response variable for this value of the explanatory variable?Enter the exact answer.The predicted value is=
Fill in the table using data from your random sample of home prices. To insert an equation,
select "Insert" and then "Equation" or simply copy and edit the equation in the third column.
Take a screenshot of the table, and embed the table as a part of your initial post, per the
instructions provided under Respond.
sample size
sample mean
95% Confidence Interval
95% Confidence Interval
(n) of home
home price
$ 704, 500
(written using interval notation)
µ=š±1.96
prices
(5)
n = 10
145600
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128000
n = 50
150000
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920000
1456000
1280000
1500000
920000
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930000
1290000|
910000
745000
780000
747000
858000
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775000
716000
886500
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1110000
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Use the figure below to answer the questions that follow. The figure shows the results of a recent Marist poll asking about President Biden’s approval rating. The range of the confidence interval for these data points is 4.3%. For example, the first row shows that among all adults in the nations, 42% approve of Biden’s work. This means that confidence intervals for this result would be approximately (38, 46).
** see image attached
The figure shows that people with less income are more likely to approve of Biden’s work than people with higher income. Is this result statistically significant given the width of the confidence interval? Explain.
2. The figure shows that people with more education are more likely to approve of Biden’s work than people with less education. Is this result statistically significant given the width of the confidence interval? Explain.
Chapter 10 Solutions
Elementary Statistics (13th Edition)
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