A survey of several 11 to 13 year olds recorded the following amounts spent on a
ID: 3324569 • Letter: A
Question
A survey of several 11 to 13 year olds recorded the following amounts spent on a trip to the mall:
$28.51, $25.01, $29.61, $30.31, $24.12, $27.49
Construct the 95% confidence interval for the average amount spent by 11 to 13 year olds on a trip to the mall. Assume the population is approximately normal.
*Calculate the Sample mean for the given data. Round your answer to two decimal places.
*Calculate the Sample standard deviation for the given data. Round your answer to two decimal places.
*Find the critical value that should be used in constructing the confidence interval. Round you answer to three decimal places.
*Construct the 95% confidence interval. Round your answer to two decimal places.
Explanation / Answer
The statistical software output for this problem is:
Summary statistics:
One sample T confidence interval:
: Mean of variable
95% confidence interval results:
Hence,
Sample mean = 27.50
Sample standard deviation = 2.49
Critical value = 2.571
95% confidence interval: (24.90, 30,12)
Column Mean Std. dev. Data 27.508333 2.489678Related Questions
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