Srideepa
07-05-2010, 05:28 AM
1. Two random samples gave the following results
Sample Size Sample Mean Sum of squares of deviation from the mean
I 10 15 90
II 12 14 108
Test whether the samples have come from the same normal population.
2. The Following data represents the number of units of Production by 5 different
Workers in different types of Machine
Machine Types
A B C D
Workers 44 38 47 36
46 40 52 43
43 38 46 33
38 42 49 39
Test whether the Mean Production is the same for different type of Machine.
Test whether the Workers differ with Mean Productivity.
3. From the data given below fit a straight Line trend by the method of least squares.
Years 1975 1976 1977 1978 1979 1980 1981 1982
Sales 6.7 5.3 4.3 6.1 5.6 7.9 5.8 6.1
4. The following data gives the experience of machine operation and their performance ratings as given by the number of goods parts turned out per 100 pieces.
Operator 1 2 3 4 5 6 7 8
Experience 16 12 18 4 3 10 5 12
Performance Rating 87 88 89 68 78 80 75 83
Obtain the regression line of performance ratings on experience and estimate the probable performance if an operator has 9 years experience
Sample Size Sample Mean Sum of squares of deviation from the mean
I 10 15 90
II 12 14 108
Test whether the samples have come from the same normal population.
2. The Following data represents the number of units of Production by 5 different
Workers in different types of Machine
Machine Types
A B C D
Workers 44 38 47 36
46 40 52 43
43 38 46 33
38 42 49 39
Test whether the Mean Production is the same for different type of Machine.
Test whether the Workers differ with Mean Productivity.
3. From the data given below fit a straight Line trend by the method of least squares.
Years 1975 1976 1977 1978 1979 1980 1981 1982
Sales 6.7 5.3 4.3 6.1 5.6 7.9 5.8 6.1
4. The following data gives the experience of machine operation and their performance ratings as given by the number of goods parts turned out per 100 pieces.
Operator 1 2 3 4 5 6 7 8
Experience 16 12 18 4 3 10 5 12
Performance Rating 87 88 89 68 78 80 75 83
Obtain the regression line of performance ratings on experience and estimate the probable performance if an operator has 9 years experience