In a survey, 11 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $44 and standard deviation (s) of $4. Construct a confidence interval at a 90% confidence level.
give your answers to one decimal place. ____+-____
t critical value at 0.10 level 10 df = 1.812
90% confidence interval is
t * S / sqrt(n)
44 1.812 * 4 / sqrt(11)
44 2.2
In a survey, 11 people were asked how much they spent on their child's last birthday...
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