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Title: Seatbelts Safety officials hope a public information campaign will increase the use of seatbelts ... Post by: Nica on Aug 31, 2019 Seatbelts Safety officials hope a public information campaign will increase the use of seatbelts above the current 70% level. Their efforts include running radio and TV ads, putting up billboards, having police officers appear on talk shows, and getting newspapers to indicate whether people injured in accidents were belted in. After several months they check the effectiveness of this campaign with a statewide survey of 560 randomly chosen drivers. 407 of those drivers report that they wear a seatbelt.
a. Verify that a Normal model is a good approximation for the binomial model in this situation. b. Does the survey result suggest that the education/advertising campaign was effective? Explain. Title: Seatbelts Safety officials hope a public information campaign will increase the use of seatbelts ... Post by: mnp2357 on Aug 31, 2019 a. np = 560(0.7) = 392, nq = 168; since both are at least 10 the sample is large enough
b. Use N(392, 10.84) to see z = 1.38. This is not an unusually high result, so the campaign may not have been effective. Title: Seatbelts Safety officials hope a public information campaign will increase the use of seatbelts ... Post by: Nica on Aug 31, 2019 Brilliant
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