Mathematics (AS & A Level) · Oct / Nov 2025 · Paper 61 · Question 4
9709
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The masses of a certain species of animal are known to be normally distributed with standard deviation v kg. A researcher obtains the masses of a random sample of n animals of this species and uses these masses to find two confidence intervals (a% and 90%) for the population mean. The width of the a% confidence interval is .1 414 # the width of the 90% confidence interval.
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4(a)[3]
4(b)[1]
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