Mathematics, 19.04.2020 22:24 wrivera32802
In a survey, 16 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $37 and standard deviation of $17. Construct a confidence interval at a 95% confidence level.
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![CI=\mu\pm z \frac{\sigma}{\sqrt{n}}\\\\=\mu\pm z_{0.025}\frac{\sigma}{\sqrt{n}}\\\\=37\pm1.96\times\frac{17}{\sqrt{16}}\\\\\\=37\pm8.33\\\\=[28.67,\ 45.33]](/tpl/images/0611/2989/a003e.png)
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In a survey, 16 people were asked how much they spent on their child's last birthday gift. The resul...
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