question archive The average weight of 25 chocolate bars selected from a normally distributed population is 200 grams with a standard deviation of 10 grams
The average weight of 25 chocolate bars selected from a normally distributed population is 200 grams with a standard deviation of 10 grams
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The average weight of 25 chocolate bars selected from a normally distributed population is 200 grams with a standard deviation of 10 grams. Find the point estimate and the confidence interval using 95% confidence level.
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Answer:
mean or average + or - 1.96(SD) = 200 + or - 1.96(10 = 200+ or 19.6
area under the normal curve from z=--1.96 to z=+1.96, is 0.95 = 95%
95% confidence interval is (180.4, 219.6)
using a less precise "empirical rule" you'd get (180, 220) Point estimate = 200 grams
