An engineer is comparing voltages for two types of batteries (K and Q) using a sample of 99 type K batteries and a sample of 100 type Q batteries. The mean voltage is measured as 8.50 for the type K batteries with a standard deviation of 0.423, and the mean voltage is 8.76 for type Q batteries with a standard deviation of 0.221. Conduct a hypothesis test for the conjecture that the mean voltage for these two types of batteries is different. Let μ1 be the true mean voltage for type K batteries and μ2 be the true mean voltage for type Q batteries. Use a 0.05 level of significance. Step 2 of 4 : Compute the value of the test statistic. Round your answer to two decimal places
Answer: Value of test statistics is z= -5.43 .
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