Test 2 Practice Quizzes (Ch. 12 & 13, 18, and 19

A manager wants to forecast the demand for this week, given the past 5 weeks' sales. Week Sales Five weeks ago 136 Four weeks ago 133 Three weeks ago 150 Two weeks ago 160 Last week 180 What is the slope (b) of the least squares trend line for these data? a.) 11.5 b.) 28.26 c.) 20 d.) 27.6 e.) 13.5

a.) 11.5

Which of the following is in Six Sigma DMAIC cycle? a.) Measure b.) Inform c.) Design d.) Compare e.) Act

a.) Measure

Variation that is random and inherent in a production process itself is called random variation. a.) True b.) False

a.) True >>> key word RANDOM or else it would be a common variation

The range chart (R-chart) is most likely to detect a change in: a.) variability b.) sample size c.) number defective d.) proportion e.) mean

a.) variability

Using the information in Q8, what is the Y-intercept (a) of the least squares trend line for these data? a.) 123.6 b.) 117.3 c.) 120 d.) 55.85 e.) 115.5

b.) 117.3

Using the information in Q8, what is this week's forecast using the least squares trend line for these data? a.) 201 b.) 186.3 c.) 289.2 d.) 253.67 e.) 235.5

b.) 186.3

Using the information of Q1, what is the estimate of the sample average range based upon this limited sample? a.) 13 b.) 4.33 c.) 2 d.) 5.4 e.) 4.2

b.) 4.33

Concluding a process is out of control when it is not is known as a Type II error or consumer's risk. a.) True b.) False

b.) False >> IT IS A TYPE I ERROR

The philosophical leaders of the quality movement, Philip Crosby, W. Edwards Deming, and Joseph M. Juran, had the same general message about what it took to achieve outstanding quality. Which of the following was not part of that message? a.) Total involvement of the workforce b.) Quality is free c.) Continuous improvement d.) Leadership from senior management e.) Customer focus

b.) Quality is free

The specification limit for a product is 9 cm +/- 1 cm. A process that produces the product has a mean of 9.5 cm and a standard deviation of 0.2 cm. What is the process capability, Cpk ? a.) 2.5 b.) 1.67 c.) 0.83 d.) 3.33 e.) 1

c.) 0.83

You want to develop an "R" chart. You know the average range is 5 and the sample size is 6. Which of the following is the resulting UCL? a.) 10 b.) 12.66 c.) 10.55 d.) 0 e.) 2.4

c.) 10.55 >>> 5(2.11)

What is the z-value associated with a 2.5% alpha risk? a.) 1.96 b.) 2.17 c.) 2.24 d.) 3 e.) 1.15

c.) 2.24 >>> 0.5 - 0.025 = 0.4875

Use the following to answer Q1-Q5: A Quality Analyst wants to construct a mean control chart for determining whether three machines, all producing the same product, are in control with regard to a particular quality variable. Accordingly, he randomly picked four units of output from each machine, with the following results: Machine Measurments #1 17 || 15 || 15 || 17 #2 16 || 25 || 18 || 25 #3 23 || 24 || 23 || 22 What is the sample size (i.e., number of units/items in each sample)? [Hint: Each row is a sample. There are three samples. Each sample has 4 items.] a.) 1 b.) 3 c.) 4 d.) 5 e.) 12

c.) 4

For which of the following should we use a p-chart to monitor process quality? a.) The dimensions of brick entering a kiln b.) Lengths of boards cut in a mill c.) Grades in a freshman "pass/fail" course d.) The weight of fluid in a container e.) Temperatures in a classroom

c.) Grades in a freshman "pass/fail" course

Using the control limits in Q4, which machine(s), if any, should he conclude is (are) out of control? a.) All machines b.) Machine #3 c.) Machine #1 d.) Machine #2 e.) None is out of control

c.) Machine #1

For which of the following should we use an X-bar chart based on sample means to monitor process quality? a.) Determining whether computer software has errors b.) Vehicles passing emissions inspection c.) Tire pressures in an auto assembly plant d.) Grades in a freshman "pass/fail" course e.) Products with missing operations

c.) Tire pressures in an auto assembly plant

Which term most closely relates to causal relationship forecasting techniques? a.) Delphi technique b.) time series data c.) predictor variables d.) consumer survey e.) expert opinions

c.) predictor variables

Using the information in Q6, what are the 3-sigma (means z=3) control limits? a.) 0 and 0.313 b.) 0 and 0.132 c.) 0 and 0.276 d.) 0 and 0.126 e.) 0 and 0.148

d.) 0 and 0.126 >>> (0.057 + (3 x 0.023)) and (0.057 - (3 x 0.023))

Using the information in Q6, what is the standard deviation of the sampling distribution for the sample defective rate? Please carry three decimal places. a.) 0.073 b.) 0.024 c.) 0.081 d.) 0.023 e.) 0.026

d.) 0.023 >>> √(0.057 (1 - 0.057))/300)

Using the following to answer Q6-Q8: The results of inspection of DNA samples taken over the past 10 days are given below. Sample size is 100. Day 1 2 3 4 5 6 7 8 9 10 Defectives 7 6 6 9 5 6 0 8 9 1 What is the average defective rate for these samples? a.) 0.09 b.) 0.08 c.) 0.06 d.) 0.057 e.) 0.07

d.) 0.057 >>> (57) / (10 x 100)

The manager of a music and video retail chain wants to forecast DVD sales for September based on the following historical data: Month Sales April 15,000 May 16,000 June 18,000 July 20,000 August 21,000 What is the forecast for September using exponential smoothing with alpha = 0.5, if the forecast for July was 16,000? a.) 22,650 b.) 18,750 c.) 22,800 d.) 19,500 e.) 21,000

d.) 19,500

Using the information of Q1, what are the X-bar chart upper and lower control limits? a.) 23.29 and 16.71 b.) 23.5 and 16.5 c.) 22 and 18 d.) 23.16 and 16.84 e.) 24 and 16

d.) 23.16 and 16.84

A manager uses the following equation to predict monthly receipts: Yt = 40,000 + 150t. What is the forecast for April of Year 2019 if t = 0 in January of Year 2019 and seasonal factor for April is SApril= 1.10? a.) 41,050 b.) 40,600 c.) 40,450 d.) 44,495 e.) 44,660

d.) 44,495

The dimension of design quality that concerns the sensory characteristics of the product is which of the following? a.) Features b.) Perceived quality c.) Serviceability d.) Aesthetics e.) Reputation

d.) Aesthetics

If a firm produced a product that is experiencing growth in demand, the smoothing constant alpha used in an exponential smoothing forecasting model would tend to be which of the following? a.) Close to zero b.) A very low percentage, less than 10% c.) 50 % or more d.) The more rapid the growth, the higher the percentage e.) The more rapid the growth, the lower the percentage

d.) The more rapid the growth, the higher the percentage

A company wants to forecast demand using the weighted moving average with the weights of 0.4, 0.3 and 0.3 (most recent period, next recent period, etc). If the company has five prior yearly sales values (i.e., year 2014 = 160, year 2015 = 150, year 2016 = 160, year 2017 = 140 and year 2018 = 170), which of the following is the weighted moving average forecast for year 2019? a.) 170 b.) 152 c.) 146 d.) 168 e.) 158

e.) 158

Using the information of Q1, what is the estimate of the process mean? a.) 19 b.) 21 c.) 23 d.) 16 e.) 20

e.) 20

Given forecast errors of 4, 8, and - 3, what is the mean absolute deviation? a.) 3 b.) 12 c.) 6 d.) 4 e.) 5

e.) 5

Which of the following is the cost of quality classification for costs such as defects that pass through the system (e.g., customer warranty replacements, loss of customer or goodwill, handling complaints, and product repair)? a.) Internal failure costs b.) Prevention costs c.) Appraisal costs d.) Customer return cost e.) External failure costs

e.) External failure costs

In most cases, demand for products or services can be broken into several components. Which of the following is NOT considered a component of demand? a.) Average demand for a period b.) Cyclical elements c.) A trend d.) Seasonal elements e.) Previous demand

e.) Previous demand