A new insecticide is advertised to kill more than 95% roaches upon contact.  In a laboratory test, the insecticide was applied to 400 roaches and 384 died immediately after contact. Is this sufficient evidence to support the advertised claim?  Use α=0.05.   (b) Test statistic for the problem above is

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Q: The recommended daily dietary allowance for zinc among males older than age 50 years is 15 mg/day.…

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