Statistics



Statistics

8.

a)

x

f

37

1

40

1

43

2

44

4

45

4

46

7

47

2

48

1

49

1

51

1

Mean =

1083

=

45.125

or

45

24

SD =

2.7

b)

S.D = 2.7

Mean = 45

45 + (1.5 * 2.7) = 49.05

c)

2

9.

a)

b) & c)

Statistics

Salary

N

Valid

49

Missing

0

Range

40.0

Quartiles

Q 1

17.0

Q 3

22.0

d)

The difference in the range and IQR values are ;

Q 1 = 40 - 17 = 23

Q 3 = 40 - 22 = 18

10.

a)

For Test 1, the median will be Q2

b)

Test 2 median is in the highest percentage.

c)

The pass mark will be ½ (n + 1)

d)

Test 1 because nobody did not got 100%.

11.

a)

R = 0.9815

b)

From the graph, it is observed that there is positive relationship between training times and error rates, as the value of correlation is in positive that is 0.9815.

c)

Sample ...