A car manufacturer claims that their new hybrid cars give at-least 45 miles per gallon. The mean gas mileage and standard deviation of 23 random...

A car manufacturer claims that their new hybrid cars give at-least 45 miles per gallon. The mean gas mileage and standard deviation of 23 random hyrbid cars were 41 mpg and 10.3 mpg respectively. Is there enough evidence to refute the manufacturers claim? Use a=0.05

1.Identify the parameter(s)

2.Null hypothesis

3.Alternative hypothesis

4.Test Statistic

5.Rejection Region or p-value

6.Conclusion