1. If n=19, ¯xx¯(x-bar)=34, and s=12, construct a confidence
interval at a 95% confidence level. Assume the data came from a
normally distributed population.
Give your answers to one decimal place.
2. 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 $50 and standard deviation of $15.
Construct a confidence interval at a 90% confidence level.
Give your answers to one decimal place.
3. If n=30, ¯xx¯(x-bar)=48, and s=9, find the margin of error at
a 80% confidence level
Give your answer to two decimal places.
4. In a survey, 22 people were asked how much they spent on
their child's last birthday gift. The results were roughly
bell-shaped with a mean of $39 and standard deviation of $7. Find
the margin of error at a 98% confidence level.
Give your answer to two decimal places.
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