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a) If independent random samples of size n1 = n2 = 8 come from normal populations...

a)

If independent random samples of size n1 = n2 = 8 come from normal populations having the same variance, what is the probability that either sample variance will be at least 7 times as large as the other?

b)

Assume that the time of delivery of a parcel within a city follows a normal distribution. The following is the time taken (in hours) for the delivery of 8 parcels within a city: 28, 32, 20, 26, 42, 40, 28, and 30. Use these figures to judge the reasonableness of delivery services when they say it takes 30 hours on average to deliver a parcel within the city.

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