What is the confidence level if the Z calculated is 1.35 (assume a two tailed test)?

You are willing to take a 5% alpha risk.  What is the value of Z critical? You have a process and you know from extensive past experience that the population average is 21 and the population standard deviation is 1.48.  You are testing a potential substitute from a potential supplier that is offering a lower price. You are interested in the change assuming the quality is equal to or greater than your current suppliers material. If the average is statistically significantly higher than the population average of 21 then you will accept the new supplier with their material. You collected 5 parts from your process and found the average to be 23. 

Calculate the upper confidence interval for a 97% confidence interval for a population proportion if 80 defectives were found in a sample size of 4,000 units.

Which of the following is not one of the seven forms of waste?

A single event standard deviation equals 0.345. What will the standard deviation of averages equal if n = 6?

Which certification allows educational waivers to be claimed toward years of experience?

What is the number one driver that tends to differentiate between the majority of LEAN implementations and world class organizations?

What can you infer about the two populations if Z calculated = 2.08 and Z critical = 1.96?

Does the question below suggest a one tailed or a two tailed test? You have a process and you know from extensive past experience that the population average is 21 and the population standard deviation is 1.48.  You are testing a potential substitute from a potential supplier that is offering a lower price. You are interested in the change assuming the quality is equal to or greater than your current suppliers material. If the average is statistically significantly higher than the population average of 21 then you will accept the new supplier with their material. You collected 5 parts from your process and found the average to be 23. What is the value of Z calculated?    This same question will be used for questions 1-4.   

Do you have enough evidence to show a statistically significant difference between the two averages?