Null and Alternative Hypotheses Worksheet with Answer Key

What's on the worksheet

1. Each line gives a null hypothesis and the question a researcher asked before any data were collected.
   H_0\colon p = 0.90; is the claimed share too high?H_0\colon \mu = 42; has the mean gone up?H_0\colon p = 0.25; is the claim wrong?H_0\colon \mu = 3.5; has the mean dropped?H_0\colon p_1 - p_2 = 0; is p_1 smaller than p_2?
2. A made-up theme park posts that the mean weekday wait for its biggest roller coaster is 35 minutes.
3. A made-up garden nursery's catalog says 90% of its potted rosebushes bloom in their first summer.
4. A made-up laser tag arena owns old vests and new, lighter vests.
5. A made-up pet-care magazine claims that 12% of households in a state keep a pet bird.
6. A made-up tortilla factory sets its press so that the mean diameter of its tortillas is 20 centimeters.
7. A made-up snow-removal company says that, after a snowfall ends, it clears its customers' driveways in a mean time of 4 hours.