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Microsoft Word - Hypothesis testing (one population mean).docx The new director of a local YMCA has beentold by his predecessors that the average member has
Microsoft Word - Hypothesis testing (one population mean).docx
The new director of a local YMCA has beentold by his predecessors that the average member has belonged for 8.7 years. Examining a random sampleof 15 membership files, he finds the mean
length of membership to be 7.2 years, with a standard deviation of 2.5 years. Assuming the population is approximately normally distributed, and using the 0.05 level, does this result suggest that the actual mean length of membership may be some value other than 8.7 years?
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