A. A random sample of 100 recorded deaths in the United State during the past year showed an average life span of 71.8 years. Assuming a population standard edition of 8.9 years, does this seem to indicate that the mean life span today is greater than 70 years? Use a 0.05 level of significance. Using the five-step procedure results hint: z 1. State the null and alternative hypothesis H H : a 2. State the Level of significance/ degree of freedom 3. Use the appropriate test statistics

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