Question
The 150 oranges in a random sample from a certain supplier were weighed and the masses, X grams, were recorded. The results are summarised below.
n = 150 Σ x = 14 910 Σ x2 = 1 525 0
(i) Calculate a 99% confidence interval for the population mean of X. [6]
(ii) The supplier claims that the mean mass of his oranges is 100 grams. Use your answer to part (i) to explain whether this claim should be accepted. [1]
(iii) State briefly why the sample should be random. [1]
Answer/Explanation
Ans:
