CHS Math 1B/Math 1 CR 2020-2021 (Prescriptive) / Part 1. Probably Several students at a university were surveyed by about how they
registered for classes, the results are shown in the table. Find
the probability that a randomly selected student is either an
undergraduate or registered online.
Registered Online Registered In Person
211
347
Undergraduate
Graduate
329
581
0.380
0.368
0.144
0.604

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.