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Business Statistics, ISOM2500 (L3, L4 & L5)
Practice Quiz I

1. The following bar chart describes the results of a survey concerning the relevance of study to present job by school.

Focus on the School of Business and Management. What are the mode and the median respectively?
(a) Relevant, Neutral (b) Relevant, Relevant (c) Neutral, Relevant (d) Neutral, Neutral
2-4. The manager of a specialty outdoor store has gathered the following data concerning sales (in hundreds of dollars) of all the items sold by the store in the previous 2 months:
Item Type Number sold Sales $(00s)
pants and jackets 150 125
hats and gloves 30 15
socks and shoes 75 400
skiing hardware 25 65
climbing hardware 70 45

2. Using the data along with appropriate computations, which of the following could not be con-structed?
A relative frequency table based on the numbers sold of di.erent item types.

A pie chart for the percentages of sales of di.erent item types.

A bar chart for the sales of hardware for each of the two months.

A Pareto chart for the sales of di.erent item types.

3. What is the percentage of dollar sales for hardware?
(a) 16.9% (b) 27.1% (c) 10% (d) 6.9%
4. Which of the following would be the best choice for showing the share of sales due to each Item Type?
(a) Mode (b) Median (c) Frequency table (d) Relative frequency table 5. Two treatments for kidney stones are compared. The following table summarizes their respective successive rate for treatments involving both small and large kidney stones
Treatment A Treatment B
Small Stones 93% 87%
Large Stones 73% 69%

Which of the following statements is false?
Treatment A is more e.ective when used on small stones.

Treatment A is more e.ective when used on large stones.

Treatment A must be more e.ective when considering both sizes at the same time.

It is possible that Treatment A is less e.ective when considering both sizes at the same time.

6-7. Some graphical descriptions of .nal examination scores for students of a Statistics course are given below.

6. Based on the .gure above, which statement is false?
The score distribution is left skewed

The interval length for the histogram is 10

There is at least one student who got the perfect score of 100

Among all intervals in the histogram, the highest frequency occurs at 70s.

7. Based on the .gure above, which statement is correct?
There is only one outlying score.

Removing outlier(s) would increase the mean and SD.

The mean score is higher than the median score.

More than 50% of the students scored between 50 and 80.

8. Which scatterplot shows a strong negative association?

(a) (b) (c) (d) 2
9. A survey on all the .res in a big city in the last ten years is conducted, and the relationship between the number of .re eng