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Using the t-distribution, it is found that the confidence interval is (14.2, 14.8).
<h3>What is a t-distribution confidence interval?</h3>The confidence interval is:
In which:
is the sample mean.
- t is the critical value.
- n is the sample size.
- s is the standard deviation for the sample.
The critical value, using a t-distribution calculator, for a <em>two-tailed 95% confidence interval</em>, with 18 - 1 = <em>17 df</em>, is t = 2.1098.
The other parameters are given by:
.
Hence, the bounds of the interval are given by:
The confidence interval is (14.2, 14.8).
More can be learned about the t-distribution at brainly.com/question/16162795