# confidence interval

### Express the confidence interval 0.039 < p < 0.479 in the form of p ± E.

Express the confidence interval 0.039 < p < 0.479 in the form of p ± E. We find the range of this interval: Range = Upper Bound - Lower Bound...
Thread by: math_celebrity, Nov 30, 2021, 0 replies, in forum: Calculator Requests

### The brand manager for a brand of toothpaste must plan a campaign designed to increase brand recognit

The brand manager for a brand of toothpaste must plan a campaign designed to increase brand recognition. He wants to first determine the...
Thread by: math_celebrity, Jun 8, 2020, 0 replies, in forum: Calculator Requests

### A random sample of 149 students has a test score average of 61 with a standard deviation of 10. Find

A random sample of 149 students has a test score average of 61 with a standard deviation of 10. Find the margin of error if the confidence level...
Thread by: math_celebrity, May 3, 2020, 0 replies, in forum: Calculator Requests

### A survey was conducted that asked 1007 people how many books they had read in the past year. Results

A survey was conducted that asked 1007 people how many books they had read in the past year. Results indicated that x overbarequals11.3 books and...
Thread by: math_celebrity, Nov 27, 2018, 0 replies, in forum: Calculator Requests

### A random sample of 100 light bulbs has a mean lifetime of 3000 hours. Assume that the population sta

A random sample of 100 light bulbs has a mean lifetime of 3000 hours. Assume that the population standard deviation of the lifetime is 500 hours....
Thread by: math_celebrity, Jan 8, 2017, 0 replies, in forum: Calculator Requests

### A random sample of 40 adults with no children under the age of 18 years results in a mean daily leis

A random sample of 40 adults with no children under the age of 18 years results in a mean daily leisure time of 5.22 hours, with a standard...
Thread by: math_celebrity, Jan 8, 2017, 0 replies, in forum: Calculator Requests

### Which of the following descriptions of confidence interval is correct? (Select all that apply) a. I

Which of the following descriptions of confidence interval is correct? (Select all that apply) a. If a 99% confidence interval contains 0, then...
Thread by: math_celebrity, Jan 7, 2017, 0 replies, in forum: Calculator Requests

### A teacher assumed that the average of grades for a math test was 80. Imagine 20 students took the te

A teacher assumed that the average of grades for a math test was 80. Imagine 20 students took the test and the 95% confidence interval of grades...
Thread by: math_celebrity, Jan 7, 2017, 0 replies, in forum: Calculator Requests

### A random sample of n = 10 flash light batteries with a mean operating life X=5 hr. And a sample stan

A random sample of n = 10 flash light batteries with a mean operating life X=5 hr. And a sample standard deviation S = 1 hr. is picked from a...
Thread by: math_celebrity, Jan 7, 2017, 0 replies, in forum: Calculator Requests