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Can you help me with this ? The Wolf, a new plant, makes pistons where the variation in radius must be minimal. You sample 24

Can you help me with this ?

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The Wolf, a new plant, makes pistons where the variation in radius must be minimal. You sample 24 pistons and find a standard deviation of 1.1 mm. Assuming the radii to be normally distributed, find; e. and for a 80% confidence. and f. and for a 99% confidence. and g. The 90% confidence for the population variance

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