Question
An economist found that a random sample of 45 high school teachers had an average annual salary of $58,230. A previous study showed that the
An economist found that a random sample of 45 high school teachers had an average annual salary of $58,230. A previous study showed that the population standard deviation is $4450. Find the 90% confidence interval for , the average annual salary of all high school teachers.
| A. | ( 54607.2 , 58372.8 ) | |
| B. | ( 57138.3 , 59321.2 ) | |
| C. | ( 56929.8 , 59530.2 ) | |
| D. | ( 54837.9 , 58142.1 |
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Statistical Techniques in Business and Economics
Authors: Douglas A. Lind, William G Marchal
17th edition
1259666360, 978-1259666360
