(TCO 11) The component of statistical methodology that includes the collection, organization, and summarization of data is called _____.
2. Question : (TCO 11) Characteristics of the population are called _____.
3. Question : (TCO 11) Which of the following constitutes an operational approach to reducing sampling error?
Cross-checking research designs with knowledgeable analysts
Questioning the assumption that tomorrow’s and today’s population are comparable
Taking a larger sample from the population
Reducing conditions that contribute to dissimilar population segments
4. Question : (TCO 11) Calculating the average value of five sample measurements of door width is an example of which of the following?
5. Question : (TCO 11) Acting on every result as if it were a special cause of variation is known as which of the following?
6. Question : (TCO 12) A statistical technique that is useful for interpreting scatter diagrams is which of the following?
The standard deviation
Nominal group technique
7. Question : (TCO 12) Another name for a cause-and-effect diagram is which of the following?
8. Question : (TCO 12) To enable a service process to be mistake-proof, unlike manufacturing processes, the _____ must be considered.
9. Question : (TCO 12) Which of the following pairs of charts are used together?
X-Bar chart and p-chart
R-chart and p-chart
R-chart and s-chart
X-Bar chart and R-chart
10. Question : (TCO 12) A p-chart is also called a _____.
fraction defective chart
process capability chart
11. Question : (TCO 12) Determine the sample standard deviation(s) for the following data: 7, 8, 2, 1, 3, and 5.
s = 2.805
s = 3.266
s = 2.927
s = 3.578
12. Question : (TCO 12) Six samples of subgroup size 6 (n=6) were collected. Determine the upper control limit (UCL) for an X-Bar chart if the mean of the sample averages is 4.7 and the mean of the sample ranges is 0.35.
UCL = 4.86905
UCL = 4.90195
UCL = 4.72250
UCL = 5.05805
13. Question : (TCO 12) Twenty samples of subgroup size 6 (n=6) were collected for a variable measurement. Determine the upper control limit (UCL) for an R-chart if the mean of the sample ranges equals 4.4.
Factors for calculating control limits:
n A2 D3 D4
2 1.880 0 3.267
3 1.023 0 2.575
4 0.729 0 2.282
5 0.577 0 2.115
6 0.483 0 2.004
UCL = 9.3016
UCL = 1.4696
UCL = 11.3256
UCL = 8.8176
(TCO 11) What are the advantages of studying a sample from the population instead of studying the entire population though a census?
2. Question : (TCO 11) Define standard error of the mean.
3. Question : (TCO 11) Differentiate between an enumerative study and an analytic study. Which type of study is more appropriate for descriptive statistics, hypothesis testing on the population mean, and time-series analysis?
4. Question : (TCO 12) Explain the difference between Type I and Type II errors in the context of a control chart.
5. Question : (TCO 12) Define the term statistical process control.