Okay, so what was the claim? The claim was okay. My said value off 1.98 is to the right off 1.645 So I will reject minor hypothesis. Or let me write that as Zed star, it is 1.645 And since my they're statistic is greater than myself critical value, it means that if this is my critical value, this is the rejection reason. So what is my critical value if I use a critical value calculator for Al five is equal to 0.5 I get this value as 1.645 So my very critical value. All right, on I see that this is going to be a right tail test. And this one point 981.98 This is my Z statistic. Okay, so let's try to find the Z statistic. My population standard deviation is one Ready? Five 1 25. Assume that the population center division is 1 25. 64 residential customers has the mean off 905 So my ex bar is 90 fives. You find that that that random sample of 64 residential customers so n is equal to 64. In this case, this is my new ally Apotheosis. So complement of this will be that it is less than or equal to 8 74. Energy in from Information Association claims that the mean monthly residential electricity consumption in your town is more than 874 kilometers. A random sample of 12 homes included in planned study indicates that 4aCu cleaners use an average of 42 kilowatt hours per vear Assume the population of kilowatt hours to be normally distributed with population standard devia - tion of 11.9 kilowatt hours_ The Edison Electric Institute has published figures on the number of kilowatt hours used annually by various home appliances: It is claimed that Vacum cleaner uses an average of 46 kilowatt hours per year. Use the sample standard deviation of 10 kilowatt hours to construct 95% CI for is the value of 11.9 reasonable for 0-? Explain _Ĥ months, 3 weeks ago 2. Use the sample standard deviation of 10 kilowatt hours to construct 95% CI for the claim of the Edison Electric Institute reasonable? Explain_ Now_ assume the population standard deviation is unknown. What sample size is required to obtain an interval with width that is half of the width of the C.I.

Is the claim of the Edison Electric Institute reasonable? Explain_ A random sample of 12 homes included in planned study indicates that 4aCu cleaners use an average of 42 kilowatt hours per vear Assume the population of kilowatt hours to be normally distributed with population standard devia - tion of 11.9 kilowatt hours_Ĭonstruct an appropriate 95% confidence interval (C.I) for /.

Hidden figures at edison 5