1. If the observed value is 8, the expected value is 5, and the standard error is 2, then the test value used for the z test is equal to what?
2. In a particular city, the average salary of secretaries is $30000 per year. Secretaries at Company A claim that they are paid less than the city average. In a sample of 45 secretaries, their average salary was $25000 per year with a standard deviation of $5000. What is the test value for this hypothesis?
3. If the observed value is 7, the expected value is 8, and the standard error is 2, then the test value used for the z test is equal to what?
4. For the conjecture "The average rent of an apartment is more than $750 per month", what is the alternative hypothesis?
5. Nationwide, the average waiting time until a electric utility customer service representative answers a call is 300 seconds per call. The Gigantic Kilowatt Energy Company took a sample of 50 calls and found that, on the average, they answered in 280 seconds per call with a standard deviation of $55. Can the company claim that they are faster than the average utility?
6. An average computer mouse inspector can inspect 45 mice per hour. The 42 computer mice inspectors at a particular factory can only inspect 40 mice per hour with a standard deviation of 8. Does the company have reason to believe that these inspectors are slower than average?