Compute Probability of Type II Error (A cola-dispensing machine)

[taviarobin]

A cola-dispensing machine is set to dispense 9 ounces of cola per cup, with a standard deviation of 0.6 ounce. The manufacturer of the machine would like to set the control limit in such a way that, for samples of 31, 5% of the sample means will be greater than the upper control limit, and 5% of the sample means will be less than the lower control limit.

a.
At what value should the control limit be set? (Round z values to two decimal places. Round your answers to 2 decimal places.)

Value should be in between
8.83
and
9.17


b.
If the population mean shifts to 8.7, what is the probability that the change will be detected? (Round your intermediate calculations to 2 decimal places and final answer to 4 decimal places.)

Probability


c.
If the population mean shifts to 9.4, what is the probability that the change will be detected? (Round your intermediate calculations to 2 decimal places and final answer to 4 decimal places.)

Probability

 

[Deleted member 4993]

A cola-dispensing machine is set to dispense 9 ounces of cola per cup, with a standard deviation of 0.6 ounce. The manufacturer of the machine would like to set the control limit in such a way that, for samples of 31, 5% of the sample means will be greater than the upper control limit, and 5% of the sample means will be less than the lower control limit.

a.
At what value should the control limit be set? (Round z values to two decimal places. Round your answers to 2 decimal places.)

Value should be in between
8.83
and
9.17


b.
If the population mean shifts to 8.7, what is the probability that the change will be detected? (Round your intermediate calculations to 2 decimal places and final answer to 4 decimal places.)

Probability


c.
If the population mean shifts to 9.4, what is the probability that the change will be detected? (Round your intermediate calculations to 2 decimal places and final answer to 4 decimal places.)

Probability

What are your thoughts?

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[taviarobin]

Answer to thought

I read the posting. I figured out part A to this problem I'm struggling with part B and C. Just need help on those two. Trying to figure out the formula on how to compute the z value.