# Question: From a random sample of 400 registered voters in one

From a random sample of 400 registered voters in one city, 320 indicated that they would vote in favor of a proposed policy in an upcoming election.

a. Calculate the LCL for a 98% confidence interval estimate for the population proportion in favor of this policy.

b. Calculate the width of a 90% confidence interval estimate for the population proportion in favor of this policy.

a. Calculate the LCL for a 98% confidence interval estimate for the population proportion in favor of this policy.

b. Calculate the width of a 90% confidence interval estimate for the population proportion in favor of this policy.

## Answer to relevant Questions

Of a random sample of 250 marketing students, 180 rated a case of résumé inflation as unethical. Based on this information a statistician computed a confidence interval extending from 0.68 to 0.76 for the population ...Find the lower confidence limit for the population variance for each of the following normal populations. a. n = 21; a = 0.05; s2 = 16 b. n = 16; a = 0.05; s = 8 c. n = 28; a = 0.01; s = 15 A manufacturer is concerned about the variability of the levels of impurity contained in consignments of raw material from a supplier. A random sample of 15 consignments showed a standard deviation of 2.36 in the ...A firm employs 189 junior accountants. In a random sample of 50 of these, the mean number of hours overtime billed in a particular week was 9.7, and the sample standard deviation was 6.2 hours. a. Find a 95% confidence ...A class has 420 students. The final examination is optional-taking it can raise, but cannot lower, a student's grade. Of a random sample of 80 students, 31 indicated that they would take the final examination. Find a 90% ...Post your question