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.

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