45 pointsthe relationship between the number of hours a plumber works and the total work fee she charges is proportional. her fee for 5 hours of work is $350. which of the following could be combinations of values for the plumber's work hours and total work fee she charges? choose 3 answers. question 1 options: a) 3 hours and $270 b) 3.5 hours and $245 c) 6 hours and $420 d) 7.25 hours and $507.50 e) 8 hours and $490

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.