An entrepreneur is considering the purchase of a coin-operated laundry. The current owner claims that over the past 5 years, the mean daily revenue was 675 with a standard deviation of 75. A sample of 30 days reveals a daily mean revenue of 625 and a standard deviation of 70. Which of the following tests will be the most appropriate?
A) t test for the mean B) Z test for the proportion
C) Pooled-variance t test D) Separate-variance t test
Question 2
A major Blu-ray rental chain is considering opening a new store in an area that currently does not have any such stores. The chain will open if there is evidence that more than 5,000 of the 20,000 households in the area are equipped with Blu-ray players. It conducts a telephone poll of 300 randomly selected households in the area and finds that 96 have Blu-ray players. Which of the following tests will be the most appropriate?
A) t test for the mean B) Z test for the proportion
C) Pooled-variance t test D) Separate-variance t test
The Australian 20 cent coin features a platypus.
Louisiana Purchase
A typical solenoid-operated starter.
When the exhaust is lean, the PCM applies a positive current into the pump cell.
To reverse the direction of operation, the polarity of the current through the motor is reversed.
Chilling Effect of a Cold Current