An engineer is comparing voltages for two types of batteries (K and Q) using a sample of 38 type K batteries and a sample of 31 type Q batteries. The type K batteries have a mean voltage of 9.31, and the population standard deviation is known to be 0.674. The type Q batteries have a mean voltage of 9.69, and the population standard deviation is known to be 0.631. Conduct a hypothesis test for the conjecture that the mean voltage for these two types of batteries is different. Lew, be the true mean voltage for type K batteries and be the true mean voltage for type Q batteries. Use a 0.01 level of significance. Step 2 of 5: Compute the value of the test statistic. Round your answer to two decimal places Answer/How to Enter) 2 Points Keypad ,Tables