The average baptismal cost includes 50 guests. A random sample of 32 baptismal during the past year in the National Capital Region had a mean of 53 guests and a standard deviation of 10. Is there...

The average baptismal cost includes 50 guests. A random sample of 32 baptismal during the past year in the National Capital Region had a mean of 53 guests and a standard deviation of 10. Is there sufficient evidence at the 0.05 level of significance that the average member of guest differs from the national average?