Random variance in a process, as measured by the standard deviation, can be directly reduced by:

Related MCQs

• Consider that for a process s bar (average standard deviation of 50 samples each of size 4) is found to be 10.04. The value of c4 (corresponding to sample size of .4) is .92. What is the estimated value of process standard deviation?
• Assume the cholesterol levels in a certain population have mean μ = 200 and standard deviation σ = 24. The cholesterol levels for a random sample of n = 9 individuals are measured and the sample mean x-bar is determined. What is the z-score for a sample mean x = 180?
• You conduct a hypothesis test and you observe values for the sample mean and sample standard deviation when n = 25 that do not lead to the rejection of Ho (null hypothesis). You calculate a p-value of 0.0667. What will happen to the p-value if you observe the same sample mean and standard deviation for a sample n>25?
• While random variability in a system can be removed by ______________, non-random variability requires ______________.
• The standard normal distribution has mean= ______________ and standard deviation= ______________.
• Suppose box A contains 4 red and 5 blue coins and box B contains 6 red and 3 blue coins. A coin is chosen at random from the box A and placed in box B. Finally, a coin is chosen at random from among those now in box B. What is the probability a blue coin was transferred from box A to box B given that the coin chosen from box B is red?
• In case someone is interested in process standard deviation, he should construct the ______________ chart.
• In case someone is interested in process standard deviation, he should construct the ______________ chart.
• Given that for the three samples, the value of R bar is .66 and value of d2 corresponding to three is1.128, what is the estimated standard deviation?
• A larger standard deviation for a normal distribution with an unchanged mean indicates that ‘the distribution becomes: