Question
In: Statistics and Probability
2. Referring to the data set we used in Chapter 2 comparing servers, tips, and credit...
2. Referring to the data set we used in Chapter 2 comparing servers, tips, and credit card usage, we have the following two-way table showing the servers and whether or not the customer used a credit card to pay for their meal.
A B C
Yes 21 15 15
No 39 50 17
a) Compute and interpret a 95% confidence interval for the proportion of bills paid with a credit card.
SE = 0.0373
b) Compute and interpret 90% confidence intervals for the proportion of bills for each server. A: SE = 0.0388, B: SE = 0.0393, C: SE = 0.0321
c) From the confidence intervals in part b) does it appear that Server B is responsible for 1/3 of the bills this week?
Solutions
orchestra answered 2 years agoRelated Solutions
(We are using the same data set we used in Question 2) You are the manager...
(We are using the same data set we used in Question 2)
You are the manager of the supermarket on the ground floor of
Holmes Building. You are wondering if there is a relation between
the number of students attending class at Holmes Institute each
day, and the amount of chocolate bars sold. That is, do you sell
more chocolate bars when there are a lot of Holmes students around,
and less when Holmes is quiet? If there is a...
(We are using the same data set we used in Question 2) You are the manager...
(We are using the same data set we used in Question 2)
You are the manager of the supermarket on the ground floor of
Holmes Building. You are wondering if there is a relation between
the number of students attending class at Holmes Institute each
day, and the amount of chocolate bars sold. That is, do you sell
more chocolate bars when there are a lot of Holmes students around,
and less when Holmes is quiet? If there is a...
Question 10: Referring to the data from Question 5, comparing the levels of support for an...
Question 10: Referring to the data from Question 5, comparing
the levels of support for an amalgamation proposal in the two
potentially-affected towns:
a) Assume that this data was collected after a claim was made
that the level of support is different in the two towns. Test this
claim at LOC = 95%, using the critical value method.
b) Use the p-value method to determine if your decision from
Part (a) above would change for any of ? = 0.10,...
7. Chapter 13, Question 2: Use the attached data file “Chapter 13 Data Set 1” to...
7. Chapter 13, Question 2: Use the attached data file “Chapter
13 Data Set 1” to answer this question in the book. Do you agree
with the author’s conclusion about whether practice time makes a
difference?
<15 Hours Practice
15-25 Hours Practice
More than 25 Hours Practice
58.7
64.4
68
55.3
55.8
65.9
61.8
58.7
54.7
49.5
54.7
53.6
64.5
52.7
58.7
61
67.8
58.7
65.7
61.6
65.7
51.4
58.7
66.5
53.6
54.6
56.7
59
51.5
55.4
54.7
51.5
61.4...
Using excel and the data in chapter 14 data set 2, complete the analysis and interpret...
Using excel and the data in chapter 14 data set 2, complete the
analysis and interpret the results. It is a 2 x 3 experiment: There
are two levels of severity, where the Level 1 is severe and Level 2
is mild, and there are three levels of treatment, where Level 1 is
Drug #1, Level 2 is Drug #2, and Level 3 is Placebo. This is an
ANOVA with replication because each participant received all three
levels of treatment,...
Firm Values. Referring back to the General Motors example used at the beginning of the chapter,...
Firm Values. Referring back to the General
Motors example used at the beginning of the chapter, note that we
suggested that General Motors’ stockholders probably didn’t suffer
as a result of the reported loss. What do you think was the basis
for our conclusion?
General Motors example:
A WRITE-OFF BY A COMPANY frequently means that the value of the
company’s assets has declined. In November 2007, for example,
General Motors (GM) announced that it would take a write-off of
about...
DATA SET 2 The following data were obtained from a research study comparing two treatment conditions....
DATA SET 2
The following data were obtained from a research study comparing
two treatment conditions. Analyze this data to determine whether
you will reject or fail to reject the null hypothesis based upon
your results. Two-tailed test. Alpha = .05 (Please show work)
Treatment 1
Treatment 2
10
7
8
4
7
9
9
3
13
7
7
6
6
10
12
2
Question 9: Referring to the data from Question 4, comparing tree heights in two different forest...
Question 9: Referring to the data from Question 4, comparing
tree heights in two different forest areas: a) Assume that this
data was collected after a claim was made that the mean tree
heights in these two forest areas are equal. Test this claim at LOC
= 99%, using the critical value method. b) Explain how the 99%
confidence interval for the difference in mean tree heights from
these two forest areas (as calculated in Question 4(a)) confirms
the result...
using chapter 13 data set 2, the researchers want to find out whether there is a...
using chapter 13 data set 2, the researchers want to find out
whether there is a difference among the graduation rates (and these
are percentages) of five high schools over a 10-year period. Is
there? (hint: are the years a factor?)
High School 1
High School 2
High School 3
High School 4
High School 5
2003
67
82
94
65
88
2004
68
87
78
65
87
2005
65
83
81
45
86
2006
68
73
76
57
88...
1. Here is a link to a data set comparing proficiency in a second language to...
1. Here is a link to a data set comparing proficiency in a
second language to the density of grey matter in the human
brain.
What is the correlation coefficient for these data? Use either
the =correl(array1,array2) formul in excel, or the correlation
feature in the Data Analysis ToolPak Add-in for Excel to determine
the correlation coefficient.
Report your answer to four decimal places.
Subject
2nd Language Proficiency
Grey Matter Density
1
0.26
-0.07
2
0.44
-0.08
3
0.89
-0.008...
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