1.Below are the prices per gallon of gas from a random sample of gas stations in Columbia in 2012. A reporter hypothesizes that the mean gas rates in Columbia in 2012 rose above the mean price of $3.57 the previous year (2011). Show the calculations

3.483.513.523.533.543.553.563.573.593.613.623.633.653.663.673.69 3.75

1. which test to use one tailed or two tailed? Give reason.
2. State the null and alternative hypothesis.
3. State the p-value and interpret.
4. Calculate a 95% confidence interval and interpret.