The average IQ of the adult population is 100. A researcher believes the average IQ of adults is lower than 100. A random sample of 5 adults are tested with a sample mean of 89, and sample standard deviation is 15.81. Is there enough evidence to suggest the average IQ is lower? The researcher is 99% confident in his claim.
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The researcher believes the average IQ of adults is lower than 100, so the alternative hypothesis is that the population mean is less than 100. The null hypothesis is that the population mean is equal to or greater than 100. H0: μ ≥ 100 H1: μ < 100 Show more…
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