Problem #1 (5 points)
Give at least five variables from the paragraph below, and classify each as either (1) numerical continuous, (2) numerical discrete, (3)nominal categorical, or (4) nominal ordinal.
Clue: There is a similar problem from Week 1 practice problems. Check how that problem was solved.
A typical Super Steak restaurant serves anywhere from 200 to 500 full meals every day. Fast customer turnover is essential, which in turn requires high reliability from the staff, so attendance records are kept to document how many hours a month each employee is absent from work. A customer’s total bill depends on the entrée and side dishes ordered and the kind of wine consumed—Super Steak’s wine list is quite limited, with only pinot noir, chardonnay, sauvignon blanc, and merlot being offered. Wine prices are very reasonable, ranging from $15 to $35 a bottle. Beer is also available in three different sizes of pitcher, ranging from smallest to largest: Super Pitcher, Colossal Pitcher, and Titanic Pitcher.
Problem#2 (4 points)
Read the passage below and respond to the following.
a. Describe the population of interest.
b. Describe the sample that was collected.
c. Describe a parameter of interest.
d. Describe the statistic used to estimate the parameter in (c).
Clue: Review the concepts as discussed in Week 1. Apply those concepts in the passage.
Passage:
Results of a 2015 Contact Solutions study reveal insights on perceptions and attitudes toward mobile shopping, providing direction to retailers for developing strategies for investing their dollars in the mobile app experience. Increased consumer interest in using shopping applications means retailers must adapt to meet the rising expectations for specialized mobile shopping experiences.
The study results show that 23% of consumers indicate that in-app recommendations would drive them to add more items to their cart and that 33% would spend more time in the app. But shopper priorities change the moment they need help; they expect to get it immediately and effortlessly. If forced to stop what they’re doing and leave the app to get help, 1 out of 4 shoppers would likely not make a purchase with the brand at all. The research is based on an online survey with a sample of 1,600 US adults who have made purchases via their mobile device.
Problem #3 (4 points)
Study the Pareto diagram below, which shows the sources of “medication errors” in hospitals. Then answer the questions below.
Clue: The Pareto diagram is part of this week’s topic coverage, and probably is the most important diagram among the ones covered. Learn how this is used and there are several examples available from the lecture video and practice problems.
1. Approximately what % of all errors is caused by Duplicate Order Entry?
2. Approximately what % of all errors is caused by Order Not Received?
3. Which categories of errors account for approximately 65% of all errors?
4. Which categories of errors account for approximately 85 % of all errors?
Problem #4 (2 points)
Study the passage and graph below and answer the questions that follow.
Clue: This is requires knowing how histograms are used and interpreted.
Every spring semester, the School of Business coordinates a luncheon with local business leaders for graduating seniors, their families, and friends. Corporate sponsorship pays for the lunches of each of the seniors, but students have to purchase tickets to cover the cost of lunches served to guests they bring with them. The following histogram represents the attendance at the senior luncheon, where X is the number of guests each graduating senior invited to the luncheon and f is the number of graduating seniors in each category.
1. How many graduating seniors attended the luncheon?
a. 4
b. 152
c. 275
d. 388
2. If all the tickets purchased were used, how many guests attended the luncheon?
a. 4
b. 152
c. 275
d. 388
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