TABLE 18-7
A supplier of silicone sheets for producers of computer chips wants to evaluate her
manufacturing process. She takes sample sizes of 5 from each day’s output and counts
the number of blemishes on each silicone sheet. The results from 20 days of such
evaluations are presented below.
She also decides that the upper specification limit is 10 blemishes.
Referring to Table 18-7, an R chart is to be constructed for the number of blemishes.
One way to create the lower control limit involves multiplying the mean of the sample
ranges by D3. For this data set, the value of D3 is ________.
TABLE 3-3
The ordered array below represents the number of vitamin supplements sold by a health
food store in a sample of 16 days.
19, 19, 20, 20, 22, 23, 25, 26, 27, 30, 33, 34, 35, 36, 38, 41
Note: For this sample, the sum of the values is 448, and the sum of the squared
differences between each value and the mean is 812.
Referring to Table 3-3, the arithmetic mean of the number of vitamin supplements sold
in this sample is ________.
TABLE 16-2
The monthly advertising expenditures of a department store chain (in $1,000,000s)
were collected over the last decade. The last 14 months of this time series follows:
Referring to Table 16-2, set up a scatter plot (i.e., time-series plot) with months on the
horizontal X-axis.
TABLE 8-11
A poll was conducted by the marketing department of a video game company to
determine the popularity of a new game that was targeted to be launched in three
months. Telephone interviews with 1,500 young adults were conducted which revealed
that 49% said they would purchase the new game. The margin of error was 3
percentage points.
Referring to Table 8-11, what is the needed sample size to obtain a 99% confidence
interval in estimating the percentage of the targeted young adults who will purchase the
new game to within 5% if you do not have the information on the 49% in the
interviews who said that they would purchase the new game?
TABLE 12-7
Data on the percentage of 200 hotels in each of the three large cities across the world on
whether minibar charges are correctly posted at checkout are given below.
At the 0.05 level of significance, you want to know if there is evidence of a difference
in the proportion of hotels that correctly post minibar charges among the three cities.
Referring to Table 12-7, what are the values of the absolute difference and the critical
range for the Marascuilo procedure to test for the difference in proportions between
Hong Kong and New York using a 0.05 level of significance?
TABLE 12-2
The dean of a college is interested in the proportion of graduates from his college who
have a job offer on graduation day. He is particularly interested in seeing if there is a
difference in this proportion for accounting and economics majors. In a random sample
of 100 of each type of major at graduation, he found that 65 accounting majors and 52
economics majors had job offers. If the accounting majors are designated as “Group 1”
and the economics majors are designated as “Group 2,” perform the appropriate
hypothesis test using a level of significance of 0.05.
Referring to Table 12-2, the null hypothesis will be rejected if the test statistic is
________.
TABLE 3-2
The data below represent the amount of grams of carbohydrates in a serving of
breakfast cereal in a sample of 11 different servings.
Referring to Table 3-2, the range in the carbohydrate amounts is ________ grams.
TABLE 11-8
An important factor in selecting database software is the time required for a user to
learn how to use the system. To evaluate three potential brands (A, B and C) of database
software, a company designed a test involving five different employees. To reduce
variability due to differences among employees, each of the five employees is trained
on each of the three different brands. The amount of time (in hours) needed to learn
each of the three different brands is given below:
Below is the Excel output for the randomized block design:
Referring to Table 11-8, what are the degrees of freedom of the randomized block F test
for the difference in the means at a level of significance of 0.05?