8 A local article reported that nationally 15% of all traffic accidents this year were attributed...

8 A local article reported that nationally 15% of all traffic accidents this year were attributed to road rage. A random sample of 80 accident reports from your county in the last month indicate that 10 were due to road rage.

a. Find ?̂.

b. Find a confidence interval for the population mean (to 3 decimal places). Note which software you use, or use a formula.

c. If you were going to perform a hypothesis test to prove that your county’s road rage accident rate is lower than the national average, what would your hypotheses be?

d. Complete a hypothesis test to determine if there is enough statistical evidence to support your hypothesis in part c. Use a 0.10 level of significance. Indicate what your critical value is, your p-value & write a conclusion in the context of the your hypotheses.

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orchestra answered 1 year ago

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