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Hello can someone please help me, I am struggling :( There's 2 more parts!! Question 9, 8.4.9-T HW Score: 53.86%, 5.39 of 10 points :

Hello can someone please help me, I am struggling :(

There's 2 more parts!!

image text in transcribed
Question 9, 8.4.9-T HW Score: 53.86%, 5.39 of 10 points : Homework: Week 7 Homework Pan 2 of 4 > 0 Points: 0 0H The piston diameter of a certain hand pump is 0.8 inch. The manager determines that the diameters are normally distributed, with a mean of 0.8 inch and a standard deviation of 0.005 inch. After recalibrating the production machine, the manager randomly selects 25 pistons and determines that the standard deviation is 0.0043 inch. Is there signicant evidence for the manager to conclude that the standard deviation has decreased at the a = 0.05 level of signicance? What are the correct hypotheses for this test? The null hypothesis is H0: 6 = 0.005. The alternative hypothesis is H1: 6

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