A greengrocer is investigating the weights of two types of orange, type $$\(A\)$$ and type $$\(B\)$$. She believes that on average type $$\(A\)$$ oranges weigh greater than 5 grams more than type $$\(B\)$$ oranges. She collects a random sample of 40 type $$\(A\)$$ oranges and 32 type $$\(B\)$$ oranges and records the weight, $$\(x\)$$ grams, of each orange. The table shows a summary of her data. Calculate unbiased estimates for the variance of the weights of the population of type $$\(A\)$$ oranges and the variance of the weights of the population of type $$\(B\)$$ oranges. (3)
Exam No:WST03_01_que_20201013 Year:2020 Question No:5(a)
Answer:

Knowledge points:
3. Estimation, confidence intervals and tests
Solution:
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