12.

Gnagey has a farming business that grows watermelons. Watermelons are difcult and expensive to transport so Gnagey must correctly specify the average weight of the watermelons to his shipping company so they can get the correct size boxes and truck. Gnagey claims his watermelons weigh an average of 8.42 lbs. The shipping company conducts an audit, and samples 18 of Gnagey's watermelons. From previous years' audits the company assumes the population standard deviation is known to 0.7 lbs. This year the audit nds that Gnagey's watermelons are on average 8.25 lbs. The audit is conducted at the 0.05 signicance level. What is the test statistic for the hypothesis test? (Round to two decimal places e.g. 7.46]