7. Assume a researcher is given the following: Three different sections of the same Interstate highway, with roughly equal traffic volumes, have been patrolled by the State Police at different levels of intensity for the past six months. The posted speed limit is 55 and the speeds of a random sample of motorists have been registered for each of the three sections. Lightly Patrolled Moderately Patrolled Heavily Patrolled 55 57 50 48 58 51 58 58 60 65 55 58 72 55 55 67 59 52 54 58 55 65 54 55
Assume a researcher is given the following: Three different sections of the same Interstate highway, with roughly equal traffic volumes, have been patrolled by the State Police at different levels of intensity for the past six months. The posted speed limit is 55 and the speeds of a random sample of motorists have been registered for each of the three sections.
The researcher is interested in whether there exists any statistically significant difference in the speeds. What test of significance should the researcher use and why (i.e. be sure to justify your response). Let’s assume that the researcher conducted the appropriate test of significance and obtained a value of 2.99. What does that value reveal? (That is, offer a thorough interpretation of the test statistic result.)
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