The Statistical Abstract of the United States (109th edition) reported that the mean age of all U.S.
Question: The Statistical Abstract of the United States (109th edition) reported that the mean age of all U.S. registered merchant vessels is 23.6 years. Records for 38 randomly selected US registered grain cargo ships showed that the mean age was 26.7 years with standard deviation of 5.2 years. Is this type of ship older than the national average of all merchant vessels?
State the null and alternate hypotheses
Calculate the test statistic
Determine the critical value(s).
State your decision: Should the null hypothesis be rejected?
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Solution Format: Word Document
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