MHB Point Estimate, Margin of Error and Confidence Level

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The discussion focuses on estimating the mean weight gain of 18 respondents who quit smoking, with a standard deviation of 9 pounds. To calculate the mean weight gain at a 95% confidence level, the average of the provided weight gain data must be determined. The data points include various weight gains ranging from 9 to 29 pounds. The calculation involves finding the mean and applying the appropriate statistical formulas for confidence intervals. Understanding these concepts is essential for accurately interpreting the effects of smoking cessation on weight.
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1. One of the few negative effects of quitting smoking is weight gain. The data below shows the weight gain (in pounds) of 18 respondents 12 months after they quit. If the mean gain follows a normal distribution with a standard deviation of 9 pounds, estimate the mean weight gain of the 18 respondents at a 95% confidence level.
14 13 20 22 12 12 17 10 12 9 11 17 15 24 29 13 13 19​
 
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Okay, that's a pretty straightforward problem. Do you know how to find the average of 18 numbers?
 

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