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HA1011 Applied Quantitative Methods  Holmes Institute
LO1. Explain how statistical techniques can solve business problems
LO2. Identify and evaluate valid statistical techniques in a given scenario to solve business problems
LO3. Explain and justify the results of a statistical analysis in the context of critical reasoning for a business problem solving
LO4. Apply statistical knowledge to summarize data graphically and statistically, either manually or via a computer package
LO5. Justify and interpret statistical/analytical scenarios that best fits business solution
Statistical Analysis
Question: Construct a frequency distribution using 10 classes, stating the Frequency, Relative Frequency, Cumulative Relative Frequency and Class Midpoint
Answer:
a)
Class

Frequency

Relative Frequency

Cumulative Relative Frequency

Class Midpoint

0350

10

0.167

0.167

175

350650

16

0.267

0.43

500

650950

8

0.133

0.57

800

9501250

11

0.183

0.75

1100

12501550

4

0.067

0.82

1400

15501850

4

0.067

0.88

1700

18502150

2

0.033

0.92

2000

21502450

2

0.033

0.95

2300

24502750

1

0.017

0.97

2600

27503050

2

0.033

1.00

2900

Total

60

1.000



Question. b. Using (a), construct a histogram.
Answer: b)
Question.c. Based upon the raw data (NOT the Frequency Distribution), what is the mean, median and mode?
Answer: c)
Mean

976.57

Median

797.50

Mode

401.00

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Answer 2
Question.a. Is above a population or a sample? Explain the difference.
Answer a)
Population contains all the features of the all the members of a specified group whereas sample data set includes only a subset of a population which means few features of some of the members can be presented by the sample (Gravetter, and Wallnau, 2007). In the given case, the manager of supermarket in Holmes Building provides sales data of chocolate bars sold for 7 weeks which is a sample because of containing only a subset and not the entire population of chocolate bars for whole period for the purpose.
Question.b. Calculate the standard deviation of the weekly attendance. Show your workings.
Answer b)
Standard deviation of Weekly attendance 74.06
Question.c. Calculate the Inter Quartile Range (IQR) of the chocolate bars sold. When is the IQR more useful than the standard deviation?
Answer c)
First quartile range 6114
Third quartile range 7216
Inter Quartile Range (IQR) 1102
The interquartile range is better than standard deviation in case the given data are not skewed or not have outliers (Lesik, 2018).
Question.d. Calculate the correlation coefficient. Using the problem we started with, interpret the correlation coefficient.
Answer d)

Weekly attendance

Number of chocolate bars sold

Weekly attendance

1


Number of chocolate bars sold

0.967993

1

Coefficient of correlation is 0.968 which shows positive strong relationship between the attendance and the number of chocolate bars sold. Both attendance and sale of chocolate bars are moving in the same direction. Increase in the students' attendance will increase the number of the chocolate bars sale (Gerver, and Sgroi, 2017).
Answer 3
SUMMARY OUTPUT














Regression Statistics






Multiple R

0.967993






R Square

0.93701






Adjusted R Square

0.924412






Standard Error

224.5952






Observations

7













ANOVA








df

SS

MS

F

Significance F


Regression

1

3751817

3751817

74.37736

0.000346


Residual

5

252215

50442.99




Total

6

4004032













Coefficients

Standard Error

t Stat

Pvalue

Lower 95%

Upper 95%

Intercept

1628.689

605.9

2.688049

0.0434

71.1734

3186.205

Weekly attendance

10.67723

1.238051

8.624231

0.000346

7.494724

13.85974

Question.a. Calculate AND interpret the Regression Equation. You are welcome to use Excel to check your calculations, but you must first do them by hand. Show your workings.
Answer a)
Regression Equation is given below:
Y = 10.67723*X + 1628.689
X = Attendance
For example, 10 student attendances are more, how much will be sale bards are given below:
Y = 10.67723*10 + 1628.689 = 1735.4613
10 students more attendance will increase chocolate bards by 1735.4613 more bars.
Question.b. Calculate AND interpret the Coefficient of Determination.
Answer b)
Coefficient of determination of the regression is 0.93701 which assurance high fitness of the regression model explains the variability of the independent variable through the dependent variable. The model can explain variability of students attendance up to 93.70% through the number of chocolate bars sale (Allen, 2007).
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Answer 4

Scientific training

Grassroots training

Total

Recruited from Holmes students

35

92

127

External recruitment

54

12

66

Total

89

104

193

Question.a. What is the probability that a randomly chosen player will be from Holmes OR receiving Grassroots training?
Answer a)
127/193+104/19392/193=0.72
The probability of randomly selecting a player from Holmes OR receiving Grassroots training will be 0.72.
Question.b. What is the probability that a randomly selected player will be External AND be in scientific training?
Answer b)
54/193=0.28
The probability of selecting randomly a player of External AND be in scientific training will be 0.28.
Question.c. Given that a player is from Holmes, what is the probability that he is in scientific training?
Answer c)
35/127=0.2755
Given that a player is from Holmes, the probability that he is in scientific training is 0.2755.
Question.d. Is training independent from recruitment? Show your calculations and then explain in your own words what it means.
Answer d)
Probability of selecting a player without considering recruitment = 1/89 + 1/104 = 0.021
Probability of selecting a player with considering training = 1/193 = 0.0052
Both the probability figures are different that reflects training is not independent from recruitment.
Answer 5
Question.A. The company would like to know the probably that a consumer comes from segment A if it is known that this consumer prefers Product X over Product Y and Product Z.
Answer a)
P(Prefers Product X over Product Y and Product Z) = 20%
P(Consumer from segment A) = 55%
P (Consumer comes from segment A if consumer prefers Product X over Product Y and Product Z) =
(20%)/(55%)=36.36%
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Question.B. Overall, what is the probability that a random consumer's first preference is product X?
Answer b)
P (consumer's first preference is product X) =
(55%×30%×10%×5%)/(20%)=41.25%
Answer 6
Question.A. During a 1 minute period you counted 8 people entering the store. What is the probability that only 2 or less of those 8 people will buy anything?
Answer a)
P (buy) = 1/8=0.125
P (buy) = 10.125 = 0.875
P(x)= n!/(nx)!x!×?(p)?^x ?(q)?^((nx)) (Laudanski, 2012)
P(0)
P(0)= 8!/(80)!0!×?(0.125)?^0 ?(0.875)?^((80))
P(0)= 8!/(80)!0!×?(0.125)?^0 ?(0.875)?^((80))
P(0)= 0
P(1)
P(1)= 8!/(81)!1!×?(0.125)?^1 ?(0.875)?^((81))
P(1)= 0.3927
P(2)
P(2)= 8!/(82)!2!×?(0.125)?^2 ?(0.875)?^((82))
P(2)= 0.1963
Probability of 2 or less than 2 customers buy = 0.3927 + 0.1963 = 0.589 = 58.90%.
Question.b) You need at least 6 staff members to help that many customers but usually have 7 staff on roster during that time slot. The 7th staff member rang to let you know he will be 2 minutes late. What is the probability 9 people will enter the store in the next 2 minutes?
Answer b)
P(k) = (e^(λ) λ^k)/k!
P(9) = (?2.71828?^(4) 4^9)/9!
P(9)= (?2.71828?^(4) 4^9)/9!
P(9)=0.013231
The probability 9 people will enter the store in the next 2 minutes is 0.013231.
Average number of customers = (4+4)/2 = 4
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Answer 7
Question.A. Assuming a normal distribution, what is the probability that apartment will sell for over $2 million?
Answer a)
Average sale = µ = $1,100,000
Standard Deviation = σ = $385,000
X = $2,000,000
Z= (Xµ )/σ
Z= ($2,000,000$1,100,000 )/$385,000
Z = 2.337
Probability figure at z = 2.337 is 0.9903.
The probability of apartment will be sold for over $2 million is 0.0097 (10.9903).
Question. B. What is the probability that the apartment will sell for over $1 million but less than $1.1 million?
Answer b)
Average sale = µ = $1,100,000
Standard Deviation = σ = $385,000
X = $1,000,000
Z= (Xµ )/σ
Z= ($1,000,000$1,100,000 )/$385,000
Z = 0.26
Probability figure at z = 0.26 is 0.3975.
Average sale = µ = $1,100,000
Standard Deviation = σ = $385,000
X = $1,100,000
Z= (Xµ )/σ
Z= ($1,100,000$1,100,000 )/$385,000
Z = 0
Probability figure at z = 0 is 0.5.
The probability of apartment will be sold for over $1 million but less than $1.1 million is 0.1025 (0.500.3975) (Browner, 2006).
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Answer 8
Question. A. Since the apartments on Surfers Paradise are a mix of cheap older and more expensive new apartments, you know the distribution is NOT normal. Can you still use a Zdistribution to test your assistant's research findings against yours? Why, or why not?
Answer a)
Normal distribution data set is rare in the real world because of the slightly skewed data distribution. However highly skewed data distribution needs to find the outliers and after excluding the same, the data can be normalized for the statistical analysis. Skewed data rejects the mean as measure of central tendency. In this situation, Median can be taken as measure of central tendency. Therefore, in the given case, the given data distribution is not normally distribution, in this case also Zdistribution is used because there is use of the standard deviation for finding the value of the same (Gravetter, and Wallnau, 2009).
Question. Based on your sample of 45 investors, what is the probability that 30% of the investors would be willing to commit $1 million or more to the fund?
Answer b)
Average investment = µ = $950,000
Standard Deviation = σ = $385,000
X = $1,000,000
Z= (Xµ )/σ
Z= ($1,000,000$950,000 )/$385,000
Z = 0.1299 = 0.13
Probability figure at z = 0.13 is 0.5517.
The probability that 30% of the investors will be willing to commit $1 million or more to the funds is 0.5517.
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