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the average IQ of the adult population is 100. A researcher believes the average IQ of adults is lower. A random sample of 5 adults

the average IQ of the adult population is 100.

A researcher believes the average IQ of adults is lower. A random sample of 5 adults are tasted and scored 69, 79, 89, 99, 109.(s.d.=15.81).

Is there enough evidence to suggest the average IQ is lower?

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