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# quiz5_1124 - two-sided conﬁ-dence interval on the mean...

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EGN 3443 Probability & Statistics for Engineers Quiz 5 (10 points) Open book/notes, 20 minutes November 24, 2008 Name: U#: Please check below, if applicable APEX Lakeland Sarasota Good luck!

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The comprehensive strength of concrete is being tested by a civil engineer. He tests 8 specimens and obtains the following data. 2216 2237 2249 2204 2225 2301 2281 2263 a) Assuming a normally distributed population with an unknown variance, construct a 95%
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Unformatted text preview: two-sided conﬁ-dence interval on the mean strength. (5 points) b) Assuming a normally distributed population, construct a 95% two-sided conﬁdence interval on the mean strength knowing that σ = 36. (5 points) c) Explain the diﬀerence in the lengths of the intervals in parts a) and b). (2 bonus points)...
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quiz5_1124 - two-sided conﬁ-dence interval on the mean...

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