# Question: Find a the area of one tail and the confidence

Find a, the area of one tail, and the confidence coefficients of z that are used with each of the following levels of confidence.

a. 1 - a = 0.80

b. 1 - a = 0.98

c. 1 - a = 0.75

a. 1 - a = 0.80

b. 1 - a = 0.98

c. 1 - a = 0.75

## Answer to relevant Questions

Refer back to Example 9.8, page 436. Another sample is taken to estimate the proportion of convertibles. Results are n = 400 and x = 92 Find: a. the estimate for the standard error. b. the 95% confidence interval. The National Highway Traffic Safety Administration found that, among the crashes with recorded times, EMS notification times exceeded 10 minutes in 19.4% of rural fatal crashes. A random sample of 500 reported fatal crashes ...Three nationwide poll results are described below. Each of the polls is based on approximately 1005 randomly selected adults. a. Calculate the 95% confidence maximum error of estimate for the true binomial proportion based ...Find n for a 90% confidence interval for p with E = 0.02 using an estimate of p = 0.25 Determine the test criteria that would be used to test the following hypotheses when z is used as the test statistic and the classical approach is used.Post your question