The proper operation of typical home appliances requires voltage levels that do not vary much. A simple random sample of 14 voltage levels (in volts) was observed and measured at a house on 14 different days:

120.2	120	120.1	120.1	120.1
120.1	120.5	120.2	120	120.2
120	120.3	120	120

The mean was 120.1 volts with a standard deviation of 0.1 volts. Under 10% significance level can you conclude that the population standard deviation of voltage levels at the house is the same as 0.13? (Note: If the normality plot is not provided then assume that the population is normal.)

Procedure: Select an answer One mean Z Hypothesis Test One proportion Z Hypothesis Test One variance χ² Hypothesis Test One mean T Hypothesis Test

Assumptions: (select everything that applies)