One of the most common sources of random cause variation is the people who are working in the ...

One of the most common sources of random cause variation is the people who are working in the process.
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Q. 2

A random sample of size 25 taken from a normally distributed population resulted in a sample standard deviation of a 0.93054 . The lower and upper limits of a 99 confidence interval for the population variance would be:
 a. 9.886 and 45.559
  b. 3.144 and 6.750
  c. 0.678 and 1.449
  d. 0.456 and 2.102
  e. 1.493 and 6.430

Q. 3

Process control charts, such as the x and p-charts, are used to provide signals to indicate when the output of a process is out of control.
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Q. 4

Like that of the Student t-distribution, the shape of the chi-squared distribution depends on:
 a. the population size
  b. the number of its degrees of freedom
  c. the population standard deviation
  d. whether the population is unimodal or bimodal
  e. none of these

Q. 5

Assignable cause variation refers to variation in the output of a process that is naturally occurring, expected, and that may be the result of random causes.
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Q. 6

If a hypothesis test is to be conducted regarding a population variance, then the critical value of the test will be obtained using the:
 a. normal distribution
  b. t-distribution with n - 1 degrees of freedom
  c. chi-square distribution with n - 1 degrees of freedom
  d. binomial distribution
  e. t-distribution with n + 1 degrees of freedom

Q. 7

Random cause variation refers to variation n, the output of a process that is unexpected and has an assignable cause.
  Indicate whether the statement is true or false