Question

The piston diameter of a certain hand pump is 0.4 inch. The manager determines that the...

The piston diameter of a certain hand pump is 0.4 inch. The manager determines that the diameters are normally​ distributed, with a mean of 0.4 inch and a standard deviation of 0.004 inch. After recalibrating the production​ machine, the manager randomly selects 28 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?

Math   Statistics-And-Probability   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
The piston diameter of a certain hand pump is 0.4 inch. The manager determines that the...
The piston diameter of a certain hand pump is 0.4 inch. The manager determines that the diameters are normally​ distributed, with a mean of 0.4 inch and a standard deviation of 0.003 inch. After recalibrating the production​ machine, the manager randomly selects 21 pistons and determines that the standard deviation is 0.0021 inch. Is there significant evidence for the manager to conclude that the standard deviation has decreased at the 0.10 level of​ significance? What is the P-value?
the piston diameter of a certain hand pump is 0.7 inch. the manager determines that the...
the piston diameter of a certain hand pump is 0.7 inch. the manager determines that the diameters are normally distributed, with a mean od 0.7 inch and a standard deviation of 0.003. after recalibrating the production machine the manager randomly selects 23 pistons and determines that the standard deviation is 0.0021inch.is there significant evidence for the manager to conclude that the standard deviation has decreased at the Alpha 0.10 level of significance
The piston diameter of a certain hand pump is 0.7 inch. The manager determines that the...
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 0.003 inch. After recalibrating the production​ machine, the manager randomly selects 23 pistons and determines that the standard deviation is 0.0021 inch. Is there significant evidence for the manager to conclude that the standard deviation has decreased at the alpha equals 0.10 level of​ significance? Use technology to determine...
Suppose a mutual fund qualifies as having moderate risk if the standard deviation of its monthly...
Suppose a mutual fund qualifies as having moderate risk if the standard deviation of its monthly rate of return is less than 6​%. 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 4.37​%. Is there sufficient evidence to conclude that the fund has moderate risk at the alpha equals 0.05 level of​ significance? A normal probability plot indicates that...
Suppose a mutual fund qualifies as having moderate risk if the standard deviation of its monthly...
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 25 months and determines the rate of return for a certain fund. The standard deviation of the rate of return is computed to be 2.81​%. Is there sufficient evidence to conclude that the fund has moderate risk at the alpha equals 0.05 level of​ significance? A normal probability plot indicates that...
Suppose a mutual fund qualifies as having moderate risk if the standard deviation of its monthly...
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 21 months and determines the rate of return for a certain fund. The standard deviation of the rate of return is computed to be 3.28?%. Is there sufficient evidence to conclude that the fund has moderate risk at the alpha equals 0.05 level of? significance? A normal probability plot indicates that...
Question 5: Assume that you make candy bars; the advertised weight of the candy bar is...
Question 5: Assume that you make candy bars; the advertised weight of the candy bar is 4.0 ounces with a standard deviation (sigma) of 2.35 oz. however your production manager thinks that this is not true; he thinks the candy bars are over-weight, they weigh more than 4.0 oz. To test his claim, you decided to randomly select a sample of 126 candy bars, the average weight (x-bar) is 4.5 oz. At an alpha (a) of 0.01 what do you...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT