DATA ANALYSIS AND PROBABILITY Computing a percentage from a table of values
A group of 100 middle school students were asked whether they prefer playing video games or watching TV In their spare time. The genders of the su
their responses are reported in the following table.
Watching TV
Girls
Playing video
games
17
25
35
23
Boys
(a) What percentage of the students are boys?
(b) What percentage of the students prefer playing video games?
Х
$
?
(b) 1%
Explanation
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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.