An annual survey on consumer expenditure for a country estimated 56% of its citizens to own large

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An annual survey on consumer expenditure for a country estimated 56% of its citizens to own large cars in 2017 as compared to 29% in 2012.

(a) Estimate the difference between the proportions of large car owners over the periods.

(b) If standard error is 0.040 for each proportion, find the standard error of the difference. Interpret.

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