Question 16 1 pts A small university is concerned with monitoring its electricity usage in its Student Center. Specically, ofcials want to know if the amount of electricity used differs by day of the week. They collected data for nearly a year, and the relevant summary statistics are provided. Note that electricity usage is measured in kilowatt hours. Day of Week n E 5 Sunday 45 86.48 34.89 Monday 45 109.29 27.37 Tuesday 45 110.96 28.64 Wednesday 44 115.03 31.63 Thursday 44 114.97 33.26 Friday 45 108.58 32.22 Saturday 45 87.07 38.56 Overall 313 104.56 34.25 Suppose researchers want to determine if there is at least one day that has a different average daily electricity usage. Which of the following is the correct null hypotheses for this test? Note that the subscripts indicate the day of the week. 0 Hoiusu= uM= u1= uw=um=up= USA 0 Ho:u5u=Um=u1=uw=um=up=usa=0 O H0: at least one of the means is different from the others 0 Ho: All means are different 0 Ho: None of the explanatory variables help 1]] predict electricity usage Question 15 1 pts A small university is concerned with monitoring its electricity usage in its Student Center. Specically, ofcials want to know if the amount of electricity used differs by day of the week. They collected data for nearly a year, and the relevant summary statistics are provided. Note that electricity usage is measured in kilowatt hours. Day of Week in i 5 Sunday 45 86.48 34.89 Monday 45 109.29 27.37 Tuesday 45 110.96 28.64 Wednesday 44 115.03 31.68 Thursday 44 114.97 33.26 Friday 45 108.58 32.22 Saturday 45 87.07 38.56 Overall 313 104.56 34.25 Is it safe to say that USU = 0M = 01- = ow = 0112 = CTF= 05A? 0 No. Since we do not know any of the populaon standard deviations, we can't say that they are all equal to each other. 0 No, since all of the sample standard deviations are different. 0 No, since the difference between the largest and smallest sample standard deviaiton is greater than 2. 0 Yes, since the ratio of the largest to smallest sample standard deviaiton is less than 2. Question 37 1 pts A study published in 2008 in the American Journal of Health Promotion [Volume 22, Issue 6} by researchers at the University of Minnesota (U of M) found that 124 out of 1.923 U of M females had over $6,000 in credit card debt while 61 out of 1,236 males had over $6,000 in credit card debt. For each individual. the only information obtained was whether or not they had more than $6.000 of credit card debt. Test if there is evidence that the proportion of female students at U of M with more than $6,000 credit card debt is different than the proportion of males at U of M with more than $6.000 credit card debt. Fill in the blank to correctly state the null hypothesis in words The proportion of females at the University of Minnesota with credit card debt over $6,000 is l [59'9\" l V lthe proportion of males at the University of I [Select ] the same as different than Minnesota with credit card debt over $6,000