A magazine claims to its advertiser that the mean income of its readers is $75,000. One of the advertisers is skeptical and surveys 39 readers, finding that the average reader's income is $69,530 with a standard deviation of $9,920. Test to determine if the mean income is lower than the company's stated value using α = 0.025.

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Reject H0 Conclude that mean... View the full answer

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mean income is lower than... View the full answer

The null and alternative hypotheses are, H 0 : μ = 7 5 0 0 0 H a : μ < 7 5 0 0 0 ... View the full answer

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- For critical value, t test can also be used as when n > 30, t test and z test are close. t with level of significance 0.025, and 38 degree of freedom is -2.024.
- sneha.roy
- Aug 09, 2018 at 11:20pm