EBK BUSINESS ANALYTICS
3rd Edition
ISBN: 9780135231906
Author: Evans
Publisher: VST
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Chapter 3, Problem 15PE
Apply three different colors of data bars to lunch, dinner, and delivery sales in the Excel file Restaurant Sales to visualize the relative amounts of sales. Then sort the data by the day of the week beginning on Sunday. Compare the nonsorted data with the sorted data and comment on the information content of the visualizations.
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Example Solve in series the equation
d²y
dx²
-
-xy = 0.
A clinic compared healthy dogs it owned with healthy pets brought to clinic to be neutered. The summary statistics for blood cholesterol levels (milligrams deciliter of blood) appear in the following table:
Types
n
Average
Standard deviation
Pets (P)
51
196
68.1
Clinic (C)
51
185
40.7
Difference (d = P - C)
51
11.0
44.0
(a) Find a 99% confidence interval for the difference in mean blood cholesterol levels dogs brought to the clinic (P) and dogs owned by the clinic (C).(Round your answers to 4 decimal places, if needed.)
( , )
b) Based on this confidence interval, can we conclude there is some differences in mean blood cholesterol levels between the two groups?
Yes, since the interval is completely above 0.
No, since the interval is completely above 0.
Yes, since the interval contains 0.
No, since the interval contains 0.
It is believed that animals living in northern regions have shorter appendages than animals living in southern regions. Random samples of birds were selected from each group and wing lengths for birds (in millimeters) were measured. The following table gives summary statistics.
Region
n
Average
Standard deviation
Northern (N)
30
118.2
1.7
Southern (S)
30
119.5
3.6
Difference (d = N - S)
30
-1.3
1.5
(a) Find a 98% confidence interval for the mean difference of wing lengths of birds between the northern regions and the southern regions. (Round your answers to 4 decimal places, if needed.)( , )
(b) Based on this confidence interval, is there enough evidence to support the belief?
Yes, since the interval contains 0.
No, since the interval is completely below 0.
No, since the interval contains 0.
Yes, since the interval is completely below 0.
Chapter 3 Solutions
EBK BUSINESS ANALYTICS
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Ch. 3 - A marketing researcher surveyed 92 individuals,...Ch. 3 - In the Excel file Banking Data, apply the...Ch. 3 - Apply three different colors of data bars to...Ch. 3 - For the Store and Regional Sales database, apply a...Ch. 3 - For the Excel file Closing Stock Prices, apply...Ch. 3 - Create a useful dashboard for the data in the...Ch. 3 - Create a useful dashboard for the data in the...Ch. 3 - Create a useful dashboard for the data in the...
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