Calculate mean, median, mode, variance and standard deviation for Opening Gross Sales of 2011 Movies. 5 marks (excel file) r) An analyst is considering to construct the 95% confidence interval for the...

Calculate mean, median, mode, variance and standard deviation for Opening Gross Sales of 2011 Movies.

5 marks (excel file)

r) An analyst is considering to construct the 95% confidence interval for the population mean of Opening Gross Sales of 2011 Movies. Which distribution (standard normal distribution or t distribution) would you recommend to the analyst? Provide reasoning for your recommendation.

4 marks (word file)

s) Calculate the margin of error for 95% confidence interval for the population mean of Opening Gross Sales of 2011 Movies. Show all your workings.

1 mark (excel file)

t) What is the 95% confidence interval for the population mean of Opening Gross Sales of 2011 Movies?  Interpret your results.