Q.3.1

2017 Q3

2.9

2.5

2.2

2.6

2.1

2.6

2.4

2.8

2.7

2.9

2.7

2.8

2018 Q3

2.8

2.9

2.3

2.4

2.2

2.1

2.3

2.5

2.9

2.4

(Note they are independent samples)

Q.3.1.1	Use Excel Data Analysis Tool to calculate the descriptive statistics	(14)
Q.3.1.2	Test the null hypothesis that the mean amount of company expenditure on salaries for the two years is not different, using the 5% level of significance.	(10)
Q.3.1.3	Test the null hypothesis that the two population variances are equal, using a 10% level of significance.	(5)

Q.3.2

Makro buys fridges from many vendors A and B, however, at times the fridges will be returned to the shop within the 2 year guarantee period. A sample of 96 Fridges were sampled, vendor and defective are shown below. (11 marks)

Vendor

Defective

Vendor

Defective

Vendor

Defective

A

N

B

N

A

Y

B

N

B

Y

B

N

B

N

B

N

B

N

A

Y

B

Y

B

Y

B

N

B

N

A

N

A

Y

A

Y

A

N

A

N

B

N

A

N

B

Y

B

Y

A

N

B

N

B

N

A

N

A

Y

B

Y

B

N

B

N

A

N

A

Y

B

N

A

N

B

N

B

N

A

N

A

Y

A

N

B

N

B

N

A

N

B

N

A

N

B

Y

B

N

B

N

B

N

A

N

B

N

A

N

A

Y

A

N

B

N

B

N

B

N

A

N

B

N

B

Y

A

N

B

Y

A

N

B

Y

A

N

B

N

B

N

A

Y

B

N

A

N

A

N

B

N

A

N

A

N

B

N

B

Y

B

N

A

N

B

N

A

N

B

Y

A

N

A

N

A

Y

A

N

A

Y

A

N

B

N

A

N

B

Y

B

Y

A

N

B

Y

Test the hypothesis that there is no significance difference in the number of defects fridges between Vendor A and Vendor B at the 5% level of significance.