Excel Inferences of population variance(s): Buyer’s Digest Case Buyer’s Digest rates thermostats manufactured for home temperature control. In a recent test, 10 thermostats manufactured by ThermoRite were randomly selected and placed in a test room that was maintained at a temperature of 68oF. The temperature readings of the ten thermostats are shown below: Thermostat 1 2 3 4 5 6 7 8 9 10 Temperature 67.4 67.8 68.2 69.3 69.5 67.0 68.1 68.6 67.9 67.2 Buyer’s Digest gives an “acceptable” rating to a thermostat with a temperature variance of 0.5 or less. Given significance level of α = 0.05, use a formal hypothesis test to determine whether the ThermoRite products are “acceptable” in the quality measured in the variance. r the ThermoRite’s claim is valid.
Excel
Inferences of population variance(s): Buyer’s Digest Case
Buyer’s Digest rates thermostats manufactured for home temperature control. In a
recent test, 10 thermostats manufactured by ThermoRite were randomly selected and
placed in a test room that was maintained at a temperature of 68oF. The temperature
readings of the ten thermostats are shown below:
Thermostat 1 2 3 4 5 6 7 8 9 10
Temperature 67.4 67.8 68.2 69.3 69.5 67.0 68.1 68.6 67.9 67.2
Buyer’s Digest gives an “acceptable” rating to a thermostat with a temperature variance of 0.5 or less.
Given significance level of α = 0.05, use a formal hypothesis test to determine whether the ThermoRite products are “acceptable” in the quality measured in the variance. r the ThermoRite’s claim is valid.
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