Find the curve of second degree of regression of y on x () to the following data by method of least square :
Q2) Explain the concept of confidence interval with suitable example.
Q3) Fit a least square linear approximation Y=a+bX for the data X: -1, 0, 1, 2, 3 and Y: 0, 1, 2 , 9, 29
Q4) A random sample of 900 member has a mean 3.4cms. Can it be reasonably regarded as a sample from a large population of mean 3.2cms and S.D. 2.3cms??