A paint manufacturer claims that that the average drying time for its new paint is 2 hours. To test that claim the drying times are obtained for 25 randomly selected cans of paints. Here are the drying time, in minutes. 123 109 115 121 130 127 106 120 116 136 110 131 128 139 133 122 133 119 135 109 125 130 135 120 135 a) Construct 90% confidence interval for standard deviation of the drying times. b) Do the data provide sufficient evidence to conclude that the mean drying time is greater than the manufacturer's claim of 120 minutes? Use a= 0.05.
A paint manufacturer claims that that the average drying time for its new paint is 2 hours. To test that claim the drying times are obtained for 25 randomly selected cans of paints. Here are the drying time, in minutes. 123 109 115 121 130 127 106 120 116 136 110 131 128 139 133 122 133 119 135 109 125 130 135 120 135 a) Construct 90% confidence interval for standard deviation of the drying times. b) Do the data provide sufficient evidence to conclude that the mean drying time is greater than the manufacturer's claim of 120 minutes? Use a= 0.05.
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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![A paint manufacturer claims that that the average drying time for its new paint is 2 hours. To test that claim the
drying times are obtained for 25 randomly selected cans of paints. Here are the drving time, in minutes.
123 109
115
121
130
127
106
120
116
136
131
128
139
110
133
122
133
119
135
109
125
130 135 120 135
a) Construct 90% confidence interval for standard deviation of the drying times.
b) Do the data provide sufficient evidence to conclude that the mean drying time is greater than the
manufacturer's claim of 120 minutes? Use a= 0.05.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F88a15527-4254-43b6-bf94-5c067ac245c1%2Feea357a4-1b97-4534-84e6-770d19264c39%2Fkiikuv_processed.png&w=3840&q=75)
Transcribed Image Text:A paint manufacturer claims that that the average drying time for its new paint is 2 hours. To test that claim the
drying times are obtained for 25 randomly selected cans of paints. Here are the drving time, in minutes.
123 109
115
121
130
127
106
120
116
136
131
128
139
110
133
122
133
119
135
109
125
130 135 120 135
a) Construct 90% confidence interval for standard deviation of the drying times.
b) Do the data provide sufficient evidence to conclude that the mean drying time is greater than the
manufacturer's claim of 120 minutes? Use a= 0.05.
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