A survey has conducted among SQQS2013 students about telco consumption. There are 50 random samples for variables: course group, telco types and monthly bills. Raw data shown in TABLE 2. Let = 0.05.

Analyze the data in TABLE 2 using p-value method based on the following questions:

a)Is there any difference means of monthly bills among the telco types?

(5 marks)

b)Is there enough evidence to reject the claim that there is no preference in the selection of telco types?

(5 marks)

c)Can we conclude that telco types related to course group?

(5 marks)

d)Is there any violation of assumption in 3(b) and 3(c)? Explain.

(4 marks)

TABLE 2

telco types

DIGI

MAXIS

U-MOBILE

CELCOM

OTHERS

coding

1

2

3

4

5

course group

Telco type

telco type

monthly bill

B

DIGI

1

30

B

DIGI

1

50

B

MAXIS

2

100

B

MAXIS

2

100

B

MAXIS

2

45

B

U-MOBILE

3

30

A

U-MOBILE

3

30

B

OTHERS

5

30

A

CELCOM

4

50

A

MAXIS

2

30

B

U-MOBILE

3

30

A

DIGI

1

50

B

DIGI

1

40

B

U-MOBILE

3

30

B

U-MOBILE

3

60

B

DIGI

1

40

B

DIGI

1

90

A

MAXIS

2

40

A

MAXIS

2

98

B

CELCOM

4

35

A

OTHERS

5

50

A

DIGI

1

80

B

OTHERS

5

28

B

MAXIS

2

30

B

OTHERS

5

30

A

MAXIS

2

50

B

DIGI

1

10

B

DIGI

1

10

A

DIGI

1

40

A

OTHERS

5

35

B

CELCOM

4

72

B

DIGI

1

42

A

ONEXOX

5

50

A

U-MOBILE

3

35

A

OTHERS

5

50

A

DIGI

1

60

B

MAXIS

2

50

A

U-MOBILE

3

30

A

ONEXOX

5

80

A

U-MOBILE

3

35

A

MAXIS

2

30

A

DIGI

1

130

A

OTHERS

5

40

A

OTHERS

5

59

A

MAXIS

2

50

A

MAXIS

2

42

A

CELCOM

4

55

A

DIGI

1

30

A

DIGI

1

200

A

U-MOBILE

3

40