A weed treatment prevents weeds growing for a mean of 70 days in areas to which it is applied. A new chemical is added to the treatment. The new treatment is applied to a random sample of 100 different areas and the number of days, x, for which the new treatment prevents weeds growing is recorded. The results are summarised below. Ex= 7060 and Ex² = 499000 Test whether the mean number of days for which the weed treatment prevents weeds growing has increased from 70 days, using the 1% level of significance.
A weed treatment prevents weeds growing for a mean of 70 days in areas to which it is applied. A new chemical is added to the treatment. The new treatment is applied to a random sample of 100 different areas and the number of days, x, for which the new treatment prevents weeds growing is recorded. The results are summarised below. Ex= 7060 and Ex² = 499000 Test whether the mean number of days for which the weed treatment prevents weeds growing has increased from 70 days, using the 1% level of significance.
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.3: Measures Of Spread
Problem 1GP
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![A weed treatment prevents weeds growing for a mean of 70 days in areas to which it is applied.
A new chemical is added to the treatment. The new treatment is applied to a random sample of 100 different areas and the
number of days, x, for which the new treatment prevents weeds growing is recorded. The results are summarised below.
[x = 7060 and Ex² = 499000
Test whether the mean number of days for which the weed treatment prevents weeds growing has increased from 70 days,
using the 1% level of significance.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F760a4d20-3b93-4988-896c-9ba7da04ba08%2F1696d27e-91b6-4694-96d1-0d9a60a2adea%2F3y047ris_processed.jpeg&w=3840&q=75)
Transcribed Image Text:A weed treatment prevents weeds growing for a mean of 70 days in areas to which it is applied.
A new chemical is added to the treatment. The new treatment is applied to a random sample of 100 different areas and the
number of days, x, for which the new treatment prevents weeds growing is recorded. The results are summarised below.
[x = 7060 and Ex² = 499000
Test whether the mean number of days for which the weed treatment prevents weeds growing has increased from 70 days,
using the 1% level of significance.
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