1. A consumer protection group is interested in testing a new energy saving refrigerator because of the suspicion that the new refrigerator uses less than the advertised consumption of 4.9 kilowatt hours of electricity per day.

i) Determine the null hypothesis

ii) Determine the alternative hypothesis

iii) Label the diagram given the Standard Error is 0.5 and the signifance level, = 1%

iv) If the test statistic is z = 1.5 then what is your conclusion.