A.Explain the difference between sampling error and non-sampling error using appropriate examples.

B.If all the data points in a scatter diagram lie on the same line, what are the possible values you would expect for the coefficient of correlation? Explain why.

C.A company would like to estimate how much its employees pay in childcare costs per month in order to decide whether it would be worthwhile to provide a day-care centre in its building. The company was advised by a statistician that childcare cost per month historically follows a normal distribution. A random sample of 25 employees who use childcare services revealed that on average they paid $300 per month in childcare costs with a sample standard deviation equal to $10.00. Construct and interpret a 95% confidence interval estimate for the mean monthly childcare expenses.

D.If all X values are same as the Y values, what is the slope coefficient and coefficient of determination in a regression estimation of Y against X?