Your best friend just got a new cell phone for her birthday. You really want a cell phone too, however you know that it is going to take a lot of convincing to get your parents to buy you a phone, and add you to their cell phone plan. You decide to do some research and find
out what option would be the cheapest in order to convince your parents.
Plan A: Costs a basic fee of $29.95 per month and 10 cents per text message
Plan B: Costs a basic fee of $90.20 per month and has unlimited text messages
Plan C: Costs a basic fee of $49.95 per month and 5 cents per text message

Atechnician compares repair costs for two types of microwave ovens (type i and type ii). he believes that the repair cost for type i ovens is greater than the repair cost for type ii ovens. a sample of 6767 type i ovens has a mean repair cost of $79.79$⁢79.79. the population standard deviation for the repair of type i ovens is known to be $19.18$⁢19.18. a sample of 5555 type ii ovens has a mean repair cost of $75.24$⁢75.24. the population standard deviation for the repair of type ii ovens is known to be $21.40$⁢21.40. conduct a hypothesis test of the technician's claim at the 0.050.05 level of significance. let μ1μ1 be the true mean repair cost for type i ovens and μ2μ2 be the true mean repair cost for type ii ovens. step 2 of 4 : compute the value of the test statistic. round your answer to two decimal places.