The piston diameter of a certain hand pump is 0.7 inch. The manager determines that the diameters are normally distributed, with a mean of 0.7 inch and a standard deviation of 0.005 inch. After recalibrating the production machine, the manager randomly selects 28 pistons and determines that the standard deviation is 0.0043 inch. Is there significant evidence for the manager to conclude that the standard deviation has decreased at the alpha equals 0.01 level of significance? a. The null hypothesis is H0: b. The alternative hypothesis isH1: c. Calculate the value of the test statistic. chi Subscript Superscript 2 equals (Round to three decimal places as needed.) d. The P-value is (Round to three decimal places as needed.)
The piston diameter of a certain hand pump is 0.7 inch. The manager determines that the diameters are
a. The null hypothesis is H0:
b. The alternative hypothesis isH1:
c. Calculate the value of the test statistic. chi Subscript Superscript 2 equals (Round to three decimal places as needed.)
d. The P-value is (Round to three decimal places as needed.)
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