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?
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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