The piston diameter of a certain hand pump is 0.60 inch. The manager determines that the diameters are normally distributed, with a mean of
0.60inch and a standard deviation of
0.003 inch. After recalibrating the production machine, the manager randomly selects
22 pistons and determines that the standard deviation is
0.0027 inch. Is there significant evidence for the manager to conclude that the standard deviation has decreased at the
alpha equals 0.05α=0.05
level of significance?
Calculate test statistic
Calculate P value
The piston diameter of a certain hand pump is 0.60 inch. The manager determines that the...
The piston diameter of a certain hand pump is 0.6 inch. The manager determines that the diameters are normally distributed, with a mean of 0.6 inch and a standard deviation of 0.004 inch. After recalibrating the production machine, the manager randomly selects 27 pistons and determines that the standard deviation is 0.0035 inch. Is there significant evidence for the manager to conclude that the standard deviation has decreased at the alpha equals 0.05 level of significance?
The piston diameter of a certain hand pump is 0.5 inch. The manager determines that the diameters are normally distributed, with a mean of 0.5 inch and a standard deviation of 0.004 inch. After recalibrating the production machine, the manager randomly selects 23 pistons and determines that the standard deviation is 0.0028 inch. Is there significant evidence for the manager to conclude that the standard deviation has decreased at the alpha equals 0.05 level of significance? What are the correct...
The piston diameter of a certain hand pump is 0.5 inch. The manager determines that the diameters are normally distributed, with a mean of 0.5 inch and a standard deviation of 0.003 inch. After recalibrating the production machine, the manager randomly selects 24 pistons and determines that the standard deviation is 0.0022 inch. Is there significant evidence for the manager to conclude that the standard deviation has decreased at the α=0.01 level of significance?
31.) the piston diameter of a certain hand pump is .7 inch. the manager determines that the diameters are normally distributed, with a mean of .7 inch and a standard deviation of .003 inch. after recalibratinf the production machine, the manager randomly selects 27 pistons and determines that the standard deviation is .0027 inch. is there significant evidence for the manager to conclude that the standard deviation has decreased at the a=.10 level of significance? show work The piston diameter...
The piston diameter of a certain hand pump is 0.6 inch. The manager determines that the diameters are normally distributed, with a standard deviation of 0.009 inch. After recalibrating the production machine, the manager randomly selects 20 pistons and determines that the standard deviation is 0.0075 inch. Is there sufficient evidence for the manager to conclude that the standard deviation has decreased at the α=0.05 level of significance?
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 0.006 inch. After recalibrating the production machine, the manager randomly selects 25 pistons and determines that the standard deviation is 0.0042 inch. Is there significant evidence for the manager to conclude that the standard deviation has decreased at the a=0.10 level of significance? What are the correct hypotheses for...
Compute the standardized test statistic, X. to test the claim o? statistic to the nearest thousandth. 4.3 in 12. s2 -3.6, and a = 0.05. Round the test O A. 18.490 B. 9.209 OC. 0.492 D. 12.961 8. The piston diameter of a certain hand pump is 0.5 inch. The manager determines that the diameters are normally distributed, with a mean of 0.5 inch and a standard deviation of 0.003 inch. After recalibrating the production machine, manager randomly selects 21...
Suppose a mutual fund qualifies as having moderate risk if the standard deviation of its monthly rate of return is less than 4 %. A mutual-fund rating agency randomly selects 22 months and determines the rate of return for a certain fund. The standard deviation of the rate of return is computed to be 3.43 %. Is there sufficient evidence to conclude that the fund has moderate risk at the alpha equals 0.01 level of significance? A normal probability plot...
Suppose a mutual fund qualifies as having moderate risk if the standard deviation of its monthly rate of return is less than 5% A mutual fund rating agency randomly selects 28 months and determines the rate of return for a certain fund. The standard deviation of the rate of return is computed to be 3 54% Is there sufficient evidence to conclude that the fund has moderate risk at the a= 0.05 level of significance? A normal probablity plot indicates...
n-Class Exercise 1 Instructions: Submit your work through Blackboard by the due date. Late submissions are not allowed. You can take photos of or scan your solutions Calculate or write the formulas for each test statistic and p-value for each hypothesis test question (questions 7-10). It is true you will never have to calculate these in real life, however, you should know what Megastat, or any other statistical software, is calculating. 1) According to an IRS study, it takes a...