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

Question

A survey of several 9 to 11 year olds recorded the following amounts spent on a trip to the mall: $23.71, $17.79, $29.87, $18.78, S28.76 Construct the 95% 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. Copy Data Step 4 of 4 : Construct the 95% confidence interval. Round your answer to two decimal places. TablesKeypad Answer How to enter your answe Sample mean = 23.78 Previous step answers Lower end Sample standard deviation 5.54 tan = 2.776

Explanation / Answer

given that mean x=23.78

standard devition s =5.54

n=5 and t=2.776

we know that confidence intervel= x+/- t*s/sqrt(n)

=23.78+/-2.776*5.54/sqrt(5)

=23.78+/- 6.877715774

=(16.90228422,30.65771577)

answer is (16.90,30.66)

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