Recall that Buyer's Digest is rating ThermoRite thermostats. Buyer's Digest gives an ?acceptable" rating to a thermostat with a temperature variance of 0.5 or less. We will conduct a hypothesis test (with ? = 0.10) to determine whether the ThermoRite thermostat's temperature variance is "acceptable.

Step 1: Write Hypotheses

Step 2: Test Statistics.

Step 3: Rejection Rule

Step 4: Conclusion.

Thermostat 1 2 Temperature 67.4 67.8 3 68.2 4 69.3 5 69.5 6 67.0 7 68.1 8 9 68.6 67.9 10 67.2