Question

Make sure you state your hypotheses and rejection rule. Calculate your test statistic and decide whether to reject the null hypothesis or not and then explain what that conclusion means. You will need to use formulas with proper notation and draw diagrams for each of these problems.

1. A manufacturer of cooking oil claims that not more than 0.3 ounces of her oil gets used up in frying 5-lb. of chicken. In 25 independent tests, an average of 0.32 ounces of oil, with a standard deviation of 0.07 ounces, gets used up. Oil used in frying chicken is normally distributed.

Does the sample result provide sufficient evidence to reject the manufacturer's claim? Use a level of significance of .025, and assume the amount of oil is normally distributed.

Answer 1