2. a producer of various kinds of batteries has been producing AA size batteries with a life expectancy of 110 hours. Due to an improved production process, management believes there has been an increase in life expectancy of their AA size batteries. A sample of 100 batteries showed an average of 113 hours and a sample standard deviation of 5.2 hours.

1.null hypothesis

2. alternative hypothesis

3. test statistic

4. p value

5. at 95% confidence what do you conclude?