The unlon for a particular Industry has determthed that the standard deviation of the daily wages of its workers is $22. A random sample of 60 workers in this Industry has a mean daily wage of $123. Find a 90% confidence interval for the true mean dally wage of all union workers in the industry. Then glve its lower limit and upper limit. Carry your Intermediate computations to at least three decimal places. Round your answers to one decimal place. (If necessary, consult a list of formulas.) Lower limit: Upper limit:

A study of the consultants in a particular industry has determined that the standard deviation of the hourly fee of the consultants is $23. A random sample of 60 consultants in the industry has a mean hourly fee of $111. Find a 90% confidence interval for the true mean hourly fee of all consultants in the industry. Then give its lower limit and upper limit. Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place. (If necessary, consult a list of formulas.) Lower limit:|| ? Upper limit: |

In a random sample of 29 residents living in major cities on the West Coast (Group 1) and 29 residents living in major cities on the East Coast (Group 2), each individual was asked their age. The results can be seen in the table below. The population standard deviation of the age in West Coast cities is known to be 11.2 years and in East Coast cities is known to be 9.3 years. Assume the populations are normally distributed. Run a test at a 0.05 level of significance to test if west coast cities are, on average, older. West Coast (Group 1) East Coast (Group 2) 25 34 47 45 18 37 38 20 30 19 50 26 52 79 61 46 40 29 22 55 34 23 35 35 55 36 60 51 68 41 20 50 33 32 36 38 37 26 42 44 60 19 71 28 54 27 20 18 45 30 52 20 34 22 57 43 64 62       Enter the P-Value - round to 4 decimal places. Make sure you put…

An existing inventory for a test measuring self-esteem indicates that the scores have a standard deviation of 12. A psychologist gave the self-esteem test to a random sample of 70 individuals, and their mean score was 70. Construct a 99% confidence interval for the true mean of all test scores. Then give its lower limit and upper limit. Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place.