Three different sections of the same Interstate highway, with almost equal traffic volumes, have been patrolled by
Question:
Three different sections of the same Interstate highway, with almost 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 random samples of motorists have been registered for each of the three sections. Are the differences in the average speed among the three highway sections (statistically) significant? Was more intensive patrolling effective? Use the SPSS output below.
One way
1. State the null hypothesis (in words)
2. State the research hypothesis (in words)
3. Find F critical
4. Calculate Fobtained using the intermediate results from ANOVA Table. (Hint: SPSS uses the same formula for calculation of F obtained as you have in the book).
5. Make Decision, Interpret Result (Step 5) and answer the problem questions.