Elementary Statistics
12th Edition
ISBN: 9780321836960
Author: Mario F. Triola
Publisher: PEARSON
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Question
Chapter 9.5, Problem 13BSC
To determine
To test: The claim that amounts of strontium-90 from Pennsylvania residents vary more than amounts from New York residents.
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18
A scientist claims that pneumonia causes weight loss in mice. The table shows the weights (in grams) of six mice before infection and two days after infection. At
α=0.10,
is there enough evidence to support the scientist's claim? Assume the samples are random and dependent, and the population is normally distributed. Complete parts (a) through (e) below.
Mouse
1
2
3
4
5
6
Weight (before)
19.3
19.5
23.1
20.4
21.3
19.2
Weight (after)
17.9
18.8
22.4
20.0
20.3
17.9
Question content area bottom
Part 1
(a) Identify the claim and state
H0
and
Ha.
What is the claim?
A.
Pneumonia causes weight loss in mice.
B.
Weight gain causes pneumonia in mice.
C.
Weight loss causes pneumonia in mice.
D.
Pneumonia causes weight gain in mice.
Part 2
Let
μd
be the hypothesized mean of the difference in the weights
(before−after).
What are
H0
and
Ha?
A.
H0:
μd≤0
Ha:…
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For a new study conducted by a fitness magazine, 285 females were
randomly selected. For each, the mean daily calorie consumption was
calculated for a September-February period. A second sample of 250
females was chosen independently of the first. For each of them, the
mean daily calorie consumption was calculated for a March-August
period. During the September-February period, participants consumed a
mean of 2385.6 calories daily with a standard deviation of 224. During the
March-August period, participants consumed a mean of 2414.4 calories
daily with a standard deviation of 287.5. The population standard
deviations of daily calories consumed for females in the two periods can
be estimated using the sample standard deviations, as the samples that
were used to compute them were quite large. Construct a 90% confidence
interval for u,-H, the difference between the mean daily calorie
consumption u, of females in September-February and the mean daily…
Chapter 9 Solutions
Elementary Statistics
Ch. 9.2 - Verifying Requirements In the largest clinical...Ch. 9.2 - Verifying Requirements In the largest clinical...Ch. 9.2 - Hypotheses and Conclusions Refer to the hypothesis...Ch. 9.2 - Using Confidence Intervals a. Assume that we want...Ch. 9.2 - Interpreting Displays. In Exercises 5 and 6, use...Ch. 9.2 - Interpreting Displays. In Exercises 5 and 6, use...Ch. 9.2 - Testing Claims About Proportions. In Exercises...Ch. 9.2 - Prob. 8BSCCh. 9.2 - Testing Claims About Proportions. In Exercises...Ch. 9.2 - Testing Claims About Proportions. In Exercises...
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