Question

Ms. Greene is interested in determining the amount of time it takes to solve a calculus problem. She takes a simple random sample of 40 calculus problems and finds the mean to be 6.8 minutes. The sample standard deviation is 1.6 minutes. Construct a 95% confidence interval for the true mean time it takes to solve a calculus problem. The sample mean is . The standard deviation is . The sample size is . The degrees of freedom are The critical value, t subscript alpha over 2 end subscript, for the interval is . The lower bound for the interval is minutes. Round your answer to TWO DECIMAL PLACES. The upper bound for the interval is minutes. Round your answer to TWO DECIMAL PLACES.

          Ms. Greene is interested in determining the amount of time it takes to solve a calculus problem.  She takes a simple random sample of 40 calculus problems and finds the mean to be 6.8 minutes.  The sample standard deviation is 1.6 minutes.  Construct a 95% confidence interval for the true mean time it takes to solve a calculus problem.
The sample mean is 
.
The standard deviation is 
.
The sample size is 
.
The degrees of freedom are 
The critical value, t subscript alpha over 2 end subscript, for the interval is 
.
The lower bound for the interval is 
 minutes.  Round your answer to TWO DECIMAL PLACES.
The upper bound for the interval is 
 minutes. Round your answer to TWO DECIMAL PLACES.

Added by Eduardo B.

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