Mathematical Statistics with Applications
7th Edition
ISBN: 9781111798789
Author: Dennis O. Wackerly
Publisher: Cengage Learning
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Chapter 12.4, Problem 26E
To determine
Explain about the advantages that might be derived by applying doses A, B, C, and D to a slice of tissues from the heart of each rat.
Find the principal of design that can be illustrated by this example.
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A company that produces cranberries knows that about 7% of its cranberries are bruised in the baggin process. They changed
their bagging method, and they were curious if the proportion of cranberries bruised was different. They tested
They tested Ho: p = 0.07 versus Ha: p>0.07 where p is the proportion of cranberries bruised. From a random sample of 600
cranberries they found that 60 were bruised. Those results yielded a test statistic of approximately z = 2.88 and a p-value of
0.004. Assume that the conditions for inference were met.
Is there sufficient evidence at the a = 0.01 level to conclude that the proportion of cranberries bruised is different than 7%
a
Yes, because 10% > 7%
Yes, because 0.004 7%
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An educational psychalogist is examining response times to an on-screen stimulus. The researcher believes there might be a weak effect from age, but expecis a more pronounced
effect for different color contrasis. She decides to examine a black on white (B/W) combination compared to 2 alternatives: red on white (R/W) and yellow on blue (Y/B). Here is the
data for response times (in milliseconds):
Color Scheme
B/W
R/W
Y/B
44
22
19
21
21
28
24
35
16-17
21
45
24
26
33
23
24
24
37
16
46
32
Age 18-19
36
13
19
11
15
19
20-21
19
27
Using MS Excel, conduct a 2-wày NOVA with a= 0.05. Fill in the summary table: Pvalues should be accurate to 4 decimal places and all other values accurate to 3 decimal places.
Source
df
MS
Fratio
Pvalue
Partial
Age (A)
Color (B)
Interaction (A x B)
2
2
4
Crror
63
Provide the conclusions for this 2-way ANOVA.
What is the conclusion regarding the main eflect for age (A or rows):
OThere appears to be an effect due to age.
O There is not enaugh evidence to reject the…
Taxpayers who go to a treasury office to pay their contributions complain that they wait more than 7 minutes, so there is a project to open a new box with an average cost of $80,000. The administrator decides to analyze this situation and for this he takes a sample of 14 people, analyzes only one person per day. His analysis consists of measuring the fifth taxpayer who arrives in line and takes the time they wait to go to one of the two current boxes. The times taken are: 4.7, 5.8, 2.0, 6.1, 5.8, 4.7 5.7, 9.4, 5.1, 4.2, 5.9, 8.7, 2.7, 4.8. The administrator wishes to estimate a 95% confidence interval for the mean waiting time of taxpayers, which will allow him to determine whether or not to invest in a new box.a). Determine the meanb). Determine the standard deviationc). Determine the confidence interval
Chapter 12 Solutions
Mathematical Statistics with Applications
Ch. 12.2 - Suppose that you wish to compare the means for two...Ch. 12.2 - Refer to Exercise 12.1. Suppose that you allocate...Ch. 12.2 - Suppose, as in Exercise 12.1, that two populations...Ch. 12.2 - Refer to Exercise 12.3. How many observations are...Ch. 12.2 - Suppose that we wish to study the effect of the...Ch. 12.2 - Refer to Exercise 12.5. Consider two methods for...Ch. 12.2 - Refer to Exercise 12.5. Why might it be advisable...Ch. 12.2 - The standard error of the estimator 1 in a simple...Ch. 12.3 - Consider the data analyzed in Examples 12.2 and...Ch. 12.3 - Two computers often are compared by running a...
Ch. 12.3 - When Y1i, for i = 1, 2,, n, and Y2i, for i = 1,...Ch. 12.3 - Prob. 12ECh. 12.3 - Prob. 13ECh. 12.3 - Prob. 14ECh. 12.3 - A plant manager, in deciding whether to purchase a...Ch. 12.3 - Muck is the rich, highly organic type of soil that...Ch. 12.3 - Prob. 17ECh. 12.4 - Prob. 18ECh. 12.4 - Prob. 19ECh. 12.4 - Prob. 20ECh. 12.4 - Prob. 21ECh. 12.4 - Prob. 22ECh. 12.4 - Prob. 23ECh. 12.4 - Prob. 24ECh. 12.4 - Prob. 25ECh. 12.4 - Prob. 26ECh. 12.4 - Complete the assignment of treatments for the...Ch. 12 - Prob. 28SECh. 12 - Prob. 29SECh. 12 - Prob. 30SECh. 12 - Prob. 31SECh. 12 - Prob. 32SECh. 12 - Prob. 33SECh. 12 - Prob. 34SECh. 12 - The earths temperature affects seed germination,...Ch. 12 - An experiment was conducted to compare mean...Ch. 12 - Prob. 37SE
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