9 th and 10 questii will be one..because 9 th answer be a part in 10 th questions
9) For histogram we need to construct frequency table
Range = highest observation -lowest observation = 50.75-47.25 = 3.50
Let us construct a frequency table of 5 classes , width of each class = 3.5/5 = 0.70
Class | frequency |
47.25-47.95 | 3 |
47.95-48.65 | 6 |
48.65-49.35 | 4 |
49.35-50.05 | 2 |
50.05-50.75 | 3 |
The histogram is given below
10 ) The 96% confidence interval for population standard deviation is
For 96% confidence ,
degrees of freedom = n-1 = 90-1 =89
Thus
( from chi square table for 89 df )
Thus 96% confidence interval for population standard deviation
= (1.10 , 1.49)
9 th and 10 questii will be one..because 9 th answer be a part in 10...