Assignable cause variation is also called:
a. random variation
b. special cause variation
c. common cause variation
d. within-group variation
e. none of these
Q. 2Analysis of variance (ANOVA) is a procedure for comparing more than two population means.
Indicate whether the statement is true or false
Q. 3Sixty samples of size 600 each were drawn from a manufacturing process and the number of defectives in each sample was counted. The average sample proportion was 0.04 . The lower control limit for the p chart is:
a. 0.008
b. 0.016
c. 0.064
d. 0.048
e. 0.032
Q. 4For an F-distribution, the number of degrees of freedom for the denominator:
a. must be larger than the number of degrees of freedom for the numerator
b. must be equal to the number of degrees of freedom for the numerator
c. must be smaller than the number of degrees of freedom for the numerator
d. can be larger, smaller, or equal to the number of degrees of freedom for the numerator
e. none of these
Q. 5Fifty samples of size 500 were drawn from a manufacturing process and the number of defectives in each sample was counted. The average of the sample proportion was 0.032 . The centerline for the p chart is:
a. 0.032
b. 16.0
c. 0.512
d. 0.968
e. 4.2
Q. 6The sampling distribution of the ratio of two independent sample variances selected randomly from normal populations with equal variances is:
a. a normal distribution
b. a t distribution
c. an F distribution
d. a binomial distribution
e. a chi-square distribution
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