When NYSE, NASDAQ, and the British government bonds market were planning to change prices of shares and bonds from powers of 2, such as 12, 14, 18, 116, 132, to decimals (hence 1/32 = 0.03125), they decided to run a test. If the test run of trading rooms using the new system revealed that 80% of the traders preferred the decimal system and the sample size was 200, give a 95% confidence interval for the percentage of all traders who will prefer the new system.

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