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In: Statistics and Probability

A random sample of 23 hemp seeds from a company were planted and harvested. The mean...

A random sample of 23 hemp seeds from a company were planted and harvested. The mean number of days from seed to harvest was 127 days with a standard deviation of 17.2 days. Assume the sample comes from a population that is normally distributed and construct a 95% confidence interval estimate for σ.

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Expert Solution

Solution :

Given that,

s = 17.2

s2 = 295.84

2R = 2/2,df = 36.781

2L = 21 - /2,df = 10.982

The 95% confidence interval for is,

(n - 1)s2 / 2/2 < < (n - 1)s2 / 21 - /2

(22)(295.84) / 36.781 < < (22)(295.84) / 10.982

13.30 < < 24.34

(13.30 , 24.34)

orchestra answered 2 years ago
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