The speed limit on College Terrace is 25 mph. Even after traffic-calming measures, a resident complains that cars still speed. 250 randomly selected cars were clocked with mean speed 25.55 mph and a standard deviation of 3.618. Is the mean speed of all cars greater than 25 mph? Use a significance level of ? = 0.05.a) Write the hypotheses. b) Perform the appropriate hypothesis test using a significance level of ? = 0.05, report the test statistic and p-value, and write a full conclusion. Be sure to write out what you entered in your calculator.c) Are the results statistically significant? Why or why not?d) Find the appropriate 90% confidence interval. Be sure to write out what you entered in your calculator. e) Are the results practically significant? Why or why not?

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The speed limit on College Terrace is 25 mph. Even after traffic-calming measures, a resident complains that cars still speed. 250 randomly selected cars were clocked with mean speed 25.55 mph and a standard deviation of 3.618. Is the mean speed of all cars greater than 25 mph? Use a significance level of ? = 0.05.
a) Write the hypotheses. 
b) Perform the appropriate hypothesis test using a significance level of ? = 0.05, report the test statistic and p-value, and write a full conclusion. Be sure to write out what you entered in your calculator.
c) Are the results statistically significant? Why or why not?
d) Find the appropriate 90% confidence interval. Be sure to write out what you entered in your calculator. 
e) Are the results practically significant? Why or why not?

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