COMM 214 Business Analytics Final Exam Prep – Questions and Answers | 2026 Updated | 100% Correct - Concordia University.

COMM 214 Business Analytics Final Exam Prep – Questions and Answers |
2026 Updated | 100% Correct - Concordia University.

Section A: Questions 1–25




Question 1: Descriptive Analytics
A company recorded monthly sales (in $000):
12, 15, 18, 20, 25

a) Find the mean
b) Find the median

✅ Solution:

Mean:
[
\frac{12 + 15 + 18 + 20 + 25}{5} = \frac{90}{5} = 18
]

Median (middle value):
= 18

✅ Answer:

 Mean = 18
 Median = 18




Question 2: Range
Given data: 10, 22, 35, 40, 50

✅ Solution:

[
Range = Max - Min = 50 - 10 = 40
]

✅ Answer:

,Range = 40




Question 3: Variance
Data: 2, 4, 6, 8

✅ Solution:

Mean:
[
\frac{2+4+6+8}{4} = 5
]

Variance:
[
\frac{(2-5)^2+(4-5)^2+(6-5)^2+(8-5)^2}{4}
= \frac{9+1+1+9}{4} = \frac{20}{4} = 5
]

✅ Answer:

Variance = 5




Question 4: Standard Deviation
[
\sqrt{5} \approx 2.24
]

✅ Answer:

Standard deviation ≈ 2.24




Question 5: Probability
Probability of getting heads on a fair coin?

✅ Answer:

,[
\frac{1}{2} = 0.5
]




Question 6: Conditional Probability
P(A|B) = 0.3, P(B) = 0.5

Find P(A ∩ B)

✅ Solution:

[
P(A \cap B) = P(A|B) \times P(B) = 0.3 \times 0.5 = 0.15
]

✅ Answer:

0.15




Question 7: Correlation
If r = 0.9, what does it mean?

✅ Answer:

 Strong positive relationship
 As one variable increases, the other increases




Question 8: Regression Equation
Y = 5 + 2X
Find Y when X = 3

✅ Solution:

, [
Y = 5 + 2(3) = 11
]

✅ Answer:

Y = 11




Question 9: Break-even Analysis
Fixed cost = 1000
Price = 50
Variable cost = 30

✅ Solution:

[
BE = \frac{1000}{50-30} = \frac{1000}{20} = 50
]

✅ Answer:

50 units




Question 10: Time Series
Trend component represents?

✅ Answer:

Long-term movement in data




Question 11: Moving Average
Data: 10, 20, 30, 40
2-period MA: