a. With a simple histogram, draw conclusions about the normality of these observations. Assume normality regardless. b. Calculate a 95 % confidence interval for mean compressive strength. c. Calculate a 95% confidence interval for standard deviation of compressive strength.

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Problem 7
A new formulation of concrete has been designed for a particular building application.
Naturally, the strength of concrete produced with the new formulation had to be tested for its
strength capability. The compressive strength of 12 specimens were tested, as shown below.
2216
2281
2237
2263
2249
2318
2204
2255
2225
2275
2301
2295
a. With a simple histogram, draw conclusions about the normality of these observations.
Assume normality regardless.
b. Calculate a 95% confidence interval for mean compressive strength.
c. Calculate a 95% confidence interval for standard deviation of compressive strength.
Transcribed Image Text:Problem 7 A new formulation of concrete has been designed for a particular building application. Naturally, the strength of concrete produced with the new formulation had to be tested for its strength capability. The compressive strength of 12 specimens were tested, as shown below. 2216 2281 2237 2263 2249 2318 2204 2255 2225 2275 2301 2295 a. With a simple histogram, draw conclusions about the normality of these observations. Assume normality regardless. b. Calculate a 95% confidence interval for mean compressive strength. c. Calculate a 95% confidence interval for standard deviation of compressive strength.
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