Mathematics (AS & A Level) · Oct / Nov 2020 · Paper 62 · Question 4
9709
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The areas, X cm2, of petals of a certain kind of flower have mean - cm2. In the past it has been found that - = 8.9. Following a change in the climate, a botanist claims that the mean is no longer 8.9. The areas of a random sample of 200 petals from this kind of flower are measured, and the results are summarized by Σx = 1850, Σx2 = 17 850. Test the botanist’s claim at the 2.5% significance level. [8] 7
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