A sample of 75 concrete blocks had a mean mass of 38.3 kg with a standard...

A sample of 75 concrete blocks had a mean mass of 38.3 kg with a standard deviation of 0.6 kg.

a. How many blocks must be sampled so that a 95% confidence interval will specify the mean mass to within ±0.1 kg? (Round up the final answer to the nearest integer.)

The number of blocks that must be sampled is:

b. How many blocks must be sampled so that a 99% confidence interval will specify the mean mass to within ±0.1 kg? (Round up the final answer to the nearest integer.)

The number of blocks that must be sampled is:

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orchestra answered 1 year ago

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