A survey of several 9 to 11 year olds recorded the following amounts spent on a...

A survey of several 9 to 11 year olds recorded the following amounts spent on a trip to the mall: $22.91,$17.13,$13.60 Construct the 99% confidence interval for the average amount spent by 9 to 11 year olds on a trip to the mall. Assume the population is approximately normal. Step 3 of 4 : Find the critical value that should be used in constructing the confidence interval. Round your answer to three decimal places.

Solutions

Expert Solution

n=3

Mean =17.88

SD=4.7001

99% Table value t at 3-1 = 2 DF is 9.9248

99% CI =(-9.052, 44.812)

Confidence Interval Estimate for the Mean

Data
Sample Standard Deviation	4.7001
Sample Mean	17.88
Sample Size	3
Confidence Level	99%

Intermediate Calculations
Standard Error of the Mean	2.7136
Degrees of Freedom	2
t Value	9.9248
Interval Half Width	26.9321

Confidence Interval
Interval Lower Limit	-9.0521
Interval Upper Limit	44.8121

milcah answered 9 months ago

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