MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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Question 1) Suppose you are interested in studying the relationship between the temperature of a
particular day and the number of customers that a large ice cream shop serves on that day. To do
this you randomly choose 11 days to visit the shop and record both the high temperature of that
day and how many customers it served for the entire day. You get the following data:
High Temperature (in ° F)
75
83
92
77
92
86
73
96
85
88
80
Number of Customers
430
480
600
400
510
520
370
590
590
520
430
(a) Draw a scatterplot for this data. Make sure to label your axes.
(b) Calculate the correlation coefficient, and decide if there is enough evidence for a correlation.
(c) Construct the LSR for this data. Keep one decimal place for the slope and round the intercept
to the nearest whole number.
(d) Graph the LSR on your scatterplot.
(e) Write a sentence interpreting the slope of the LSR.
(f) How many customers does your model predict will show up on day where the high temperature
is 50° F? Would you trust this prediction?
(g) How many customers does your model predict will show up on day where the high temperature
is 90° F? Would you trust this prediction?
(h) Construct the residual plot for this data. Is a linear model appropriate? Why or why not?
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Transcribed Image Text:Question 1) Suppose you are interested in studying the relationship between the temperature of a particular day and the number of customers that a large ice cream shop serves on that day. To do this you randomly choose 11 days to visit the shop and record both the high temperature of that day and how many customers it served for the entire day. You get the following data: High Temperature (in ° F) 75 83 92 77 92 86 73 96 85 88 80 Number of Customers 430 480 600 400 510 520 370 590 590 520 430 (a) Draw a scatterplot for this data. Make sure to label your axes. (b) Calculate the correlation coefficient, and decide if there is enough evidence for a correlation. (c) Construct the LSR for this data. Keep one decimal place for the slope and round the intercept to the nearest whole number. (d) Graph the LSR on your scatterplot. (e) Write a sentence interpreting the slope of the LSR. (f) How many customers does your model predict will show up on day where the high temperature is 50° F? Would you trust this prediction? (g) How many customers does your model predict will show up on day where the high temperature is 90° F? Would you trust this prediction? (h) Construct the residual plot for this data. Is a linear model appropriate? Why or why not?
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