A Washington, D.C., think tank announces the typical teenager sent 67 text messages per day in 2017.

A Washington, D.C., €œthink tank€ announces the typical teenager sent 67 text messages per day in 2017. To update that estimate, you phone a sample of 12 teenagers and ask them how many text messages they sent the previous day. Their responses were:

At the .05 level, can you conclude that the mean number is greater than 67? Estimate the p-value and describe what it tells you.

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