Schedule mock interviews on the Meeting Board, join the latest community discussions in our Consulting Q&A and find like-minded Case Partners to connect and practice with!
Back to overview

Clarification re: question 15 from McKinsey practice test A

Looking at question 15 on McKinsey practice test A (below), I undertand why "A" is a viable answer and why "B" and "C" can't be determined, but I'm not grasping why "D" can't be determined. 

Question 15: "When comparing the pilot group to the control group, which of the following
CAN be determined from the information provided in Exhibit 4 for customers
who purchased Electronics in their first transaction?
A. Percentage difference in average number of transactions per customer
B. Difference in number of customers making transactions
C. Two week time segment which had the greatest difference in number of
transactions
D. Percentage of total lift in number of transactions represented by each two
week time segment"

Per the answer key, "Option C is not possible to determine as there is no data on the number of
transactions in each time segment. Finally, Option D cannot be determined for
the same reasons as Option C"

Since "D" is asking for a percentage, could it not be determined simply by noting the percentage lift given in exhibit 4? 

Thanks in advance for any advice. 

2 Answers
< 100 Views
1
Be the first to answer!
Nobody has responded to this question yet.
Top answer
Alessa
Coach
on Jan 05, 2025
xMcKinsey & Company | xBCG | +200 individual & group coachings | feel free to schedule a 15 min intro call for free

Hey there! 

The key reason "D" cannot be determined is that while Exhibit 4 may provide the total lift or percentage lift over the entire period, it does not break down the lift into individual two-week time segments. To calculate the percentage of the total lift contributed by each segment, you would need data on the number of transactions in each segment for both the pilot and control groups. Without segment-specific transaction data, you cannot determine how much each segment contributed to the total lift, even as a percentage.

In short, "D" requires a level of granularity in the data that is not provided in Exhibit 4.

Best, Alessa

Hagen
Coach
8 hrs ago
#1 recommended coach | >95% success rate | most experience in consulting, interviewing and coaching

Hi there,

Can you please provide me with the aforementioned exhibit 4 so that I can answer your question?

Best,

Hagen

Similar Questions
Consulting
McKinsey - Strong referral one month after the application
on Jan 15, 2024
Global
7 Answers
3.1k Views
Top answer by
Expert coach | Head of recruiting for Bain | 8+ years interviewing | Free intro call
117
7 Answers
3.1k Views
+4
Consulting
solve – McKinney's assessment game excel templet
on Mar 05, 2024
Global
6 Answers
3.0k Views
Top answer by
Ex-McKinsey Partner | Most experienced coach (15 years exp, +2.000 real interviews) | 95% success rate
132
6 Answers
3.0k Views
+3
Consulting
Mckinsey Case interviews
on Feb 29, 2024
Global
8 Answers
2.7k Views
Top answer by
1400 5-star reviews across platforms | 500+ offers | Highest-rated case book on Amazon | Uni lecturer in US, Asia, EU
116
8 Answers
2.7k Views
+5
How likely are you to recommend us to a friend or fellow student?
0 = Not likely
10 = Very likely
You are a true consultant! Thank you for consulting us on how to make PrepLounge even better!