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Answer to Question #67665 in Statistics and Probability for kk
Question #67665
Of 560 broiler chickens purchased from various kinds of food stores in different regions of a country and tested for types of bacteria that cause food-borne illnesses, 65% were infected with a particular bacterium.
a) Construct a 90% confidence interval.
b) Explain what your confidence interval says about chicken sold in the country.
c) A government spokesperson claimed that the sample size was too small, relative to the billions of chickens slaughtered each year, to generalize. Is this criticism valid?
a) Construct a 90% confidence interval.
b) Explain what your confidence interval says about chicken sold in the country.
c) A government spokesperson claimed that the sample size was too small, relative to the billions of chickens slaughtered each year, to generalize. Is this criticism valid?
Expert's answer
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Comments
To compute critical values one can apply the inverse of the standard normal distribution (for example, =NORM.S.INV(1-0.1/2) in Microsoft Excel). The 90% confidence interval will have the same critical values as a one-sample two-tailed z-test with alpha=0.1.
How did you get the 1.645 beacuse I tried InvT and I'm not quite sure what values to input?
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