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Cerrena [4.2K]
2 years ago
3

The average local cell phone call length was reported to be 2.27 minutes. A random sample of 20 phone calls showed an average of

2.98 minutes in length with a standard deviation of 0.98 minute. At α=0.05, can it be concluded that the average differs from the population average?
Mathematics
1 answer:
borishaifa [10]2 years ago
5 0

Answer:

Step-by-step explanation:

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For this case we must find an expression equivalent to:

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Answer: My answer is A.

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