14.50 ●This exercise requires the use of a computer pack- age. A study on the effect of applying fertilizer in bands is described in the article "Fertilizer Placement Effects on Growth, Yield, and Chemical Composition of Bur- ley Tobacco" (Agronomy Journal [1984]: 183-188). The accompanying data were taken from a scatterplot appear- ing in the article, with y = plant Mn (ug/g dry weight)
14.50 ●This exercise requires the use of a computer pack- age. A study on the effect of applying fertilizer in bands is described in the article "Fertilizer Placement Effects on Growth, Yield, and Chemical Composition of Bur- ley Tobacco" (Agronomy Journal [1984]: 183-188). The accompanying data were taken from a scatterplot appear- ing in the article, with y = plant Mn (ug/g dry weight)
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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![14.50 ●This exercise requires the use of a computer pack-
age. A study on the effect of applying fertilizer in bands
is described in the article "Fertilizer Placement Effects
on Growth, Yield, and Chemical Composition of Bur-
ley Tobacco" (Agronomy Journal [1984]: 183-188). The
accompanying data were taken from a scatterplot appear-
ing in the article, with y = plant Mn (ug/g dry weight)
and x = distance from the fertilizer band (cm). The au-
thors suggest a quadratic regression model.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F143fb460-ca06-4a28-85d3-f8c7f8657182%2F92adec05-4bf0-40fe-b04a-aec4f1dcb5fd%2Ffhnn9nr_processed.png&w=3840&q=75)
Transcribed Image Text:14.50 ●This exercise requires the use of a computer pack-
age. A study on the effect of applying fertilizer in bands
is described in the article "Fertilizer Placement Effects
on Growth, Yield, and Chemical Composition of Bur-
ley Tobacco" (Agronomy Journal [1984]: 183-188). The
accompanying data were taken from a scatterplot appear-
ing in the article, with y = plant Mn (ug/g dry weight)
and x = distance from the fertilizer band (cm). The au-
thors suggest a quadratic regression model.
Transcribed Image Text:x
y
0
110
10
90
20
76
30
72
40
70
a.
Use a suitable computer package to find the esti-
mated quadratic regression equation.
b.
Perform the model utility test.
c. Interpret the values of R² and se.
d. Are both the linear and quadratic predictors impor-
tant? Carry out the necessary hypothesis tests and
interpret the results.
Find a 90% confidence interval for the mean plant
Mn for plants that are 30 cm from the fertilizer
band.
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