Mathematics, 12.09.2019 05:10 ariqueen
7. when companies employ control charts to monitor the quality of their products, a series of small samples is typically used to determine if the process is "in control" during the period of time in which each sample is selected. suppose a concrete-block manufacturer samples nine blocks per hour and tests the breaking strength of each. during one-hour’s test, the mean and standard deviation are 985.6 pounds per square inch (psi) and 22.9 psi, respectively. a. construct a 99% confidence interval for the mean breaking strength of blocks produced
Answers: 3
![[959.987, 1011.213]](/tpl/images/0228/7148/25319.png)
)x100% confidence interval for the average break in these conditions It is an interval for the population mean with unknown variance and is given by:![[\bar x -T_{(n-1,\frac{\alpha}{2})} \frac{S}{\sqrt{n}}, \bar x +T_{(n-1,\frac{\alpha}{2})} \frac{S}{\sqrt{n}}]](/tpl/images/0228/7148/e02e0.png)
![[985.6 - 3.355\frac{22.9}{\sqrt{9}}, [985.6 - 3.355\frac{22.9}{\sqrt{9}}] = [959.987, 1011.213]](/tpl/images/0228/7148/4bdb9.png)
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7. when companies employ control charts to monitor the quality of their products, a series of small...
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