A-LevelMathematicsProbability and statisticsOct/Nov 2025Paper 6 Q44 Marks
The masses of a certain species of animal are known to be normally distributed with standard deviation σkg. A researcher obtains the masses of a random sample of n animals of this species and uses these masses to find two confidence intervals (α% and 90%) for the population mean. The width of the α% confidence interval is 1.414 × the width of the 90% confidence interval.
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