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1. Answer the following confidence interval questions. (1) Carrie wants to construct 94% confidence interval for a population mean using normal distribution. a. What is

1. Answer the following confidence interval questions. (1) Carrie wants to construct 94% confidence interval for a population mean using normal distribution. a. What is the alpha? b. Find the critical value for Z /2 = (2) Damian wants to construct 90% confidence interval of a population mean. The population standard deviation, = 15, = 95, n = 25. a. What is the critical value Z /2 ? b. What is the margin of error, E (rounded to 3 decimal places)? c. Construct a 90% confidence interval to estimate the population mean (rounded to 3 decimal places)

2. Sarah wants to construct 99% confidence interval of a population mean weight of the 2nd graders at an elementary school. A sample of 32 randomly selected students at this school shows that the mean weight is 53 pounds with the standard deviation, 6 pounds. (1) What distribution do we use: Standard normal distribution or t-distribution ? (2) Find the critical value (rounded to 3 decimal places): (3) Find the margin of error, E (rounded to 3 decimal places).: (4) Construct a 99% confidence interval to estimate the population mean (rounded to 3 decimal places).

3. A company that produces detergents wants to estimate the mean amount of detergent in 64- ounce jugs at a 97% confidence level. The company knows that the standard deviation of the amounts of detergent in all such jugs is = .20 ounce. How large a sample should the company select so that the estimate is within a margin of error of .05 ounce?

4. Download the data, ChildOutlook.xlsx from Blackboard.

Will today's children be better off than their parents?
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(1) Find , the sample proportion of the adults who answered 'No' to the question whether they believed that today's children would be better off than their parents. (2) Find the critical value, Z /2 for 90% confidence level (rounded to 3 decimal places.) (3) Find the margin of error, E (rounded to 3 decimal places.): (4) Construct a 90% confidence interval for the population proportion of adults who believe that today's children will be better off than their parents.

5. Refer to question number 4. Suppose that you want a .90 probability that the sample proportion is within .02 of the population proportion of the adults who answered 'No' to the question whether they believed that today's children would be better off than their parents. (1) How large a sample size is needed to meet the required precision? Assume that is obtained from a previous sample. A known sample proportion is the same value as in question number 4. (2) How large a sample size is needed to meet the required precision? Assume that is not available.

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