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A cement manufacturer claims that concrete prepared from his product has a relatively stable compressive strength and that the strength measured in kilograms per square centimeter (kg/cm2) has a variability of 10 kg/cm2 or less. A sample of n = 10 measurements produced a mean and variance equal to 312and 195, respectively.
A) Construct 90% confidence interval for the variance.
B) Do these data present sufficient evidence to reject the manufacturer's claim?
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a local lawn service has determined the average time it takes to mow an average residential yard is thirty-five
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