Question 3 (20 marks)
a.Suppose, you randomly selected a customer. How likely is it that the customer will purchase
i. brand A
ii. brand B
Provide 95% interval estimates for each of the above. Show the confidence intervals graphically and interpret your results. (7 marks)
b. Provide point and 95% confidence interval estimates for the weight of tuna cans, show it graphically and interpret your results. (3 marks)
ANSWER:
c. Suppose brand A’s producer claimed that the average weight of their products is 100gm. Test the validity of this claim at 5% level of significance. Clearly show the steps involved in hypothesis testing. ( 5 marks)
ANSWER:
d. Suppose brand B’s producer claimed that less than 20% of their cans are under-filled. Test the validity of this claim at 5% level of significance. Clearly show the steps involved in hypothesis testing. (5 marks)
