3. The following table shows the average temperature outside compared to the cost of electricity for a certain house for 7 months. Average Temperature Electricity Bill
99 $150
94 $124
87 $101
84 $98
75 $82
72 $85
69 $80

(a) Using the hottest and coolest months data, find the line of best fit for this data showing all steps by hand. SHOW WORK.

(b) Using your equation from part (a), determine the average monthly temperature rounded to the nearest tenth if the electricity bill totaled $112. SHOW WORK.

(c) Using your equation from part (a), determine the electricity bill total if the average monthly temperature was 87 degrees. SHOW WORK

(d) Find the correlation coefficient of the data and use this value to describe the strength and direction of the association. Is there causation?

What is negative 3/9 times negative 2/8 ?

Each of the following data sets has a mean of x = 10. (i) 8 9 10 11 12 (ii) 7 9 10 11 13 (iii) 7 8 10 12 13 (a) without doing any computations, order the data sets according to increasing value of standard deviations. (i), (iii), (ii) (ii), (i), (iii) (iii), (i), (ii) (iii), (ii), (i) (i), (ii), (iii) (ii), (iii), (i) (b) why do you expect the difference in standard deviations between data sets (i) and (ii) to be greater than the difference in standard deviations between data sets (ii) and (iii)? hint: consider how much the data in the respective sets differ from the mean. the data change between data sets (i) and (ii) increased the squared difference îł(x - x)2 by more than data sets (ii) and (iii). the data change between data sets (ii) and (iii) increased the squared difference îł(x - x)2 by more than data sets (i) and (ii). the data change between data sets (i) and (ii) decreased the squared difference îł(x - x)2 by more than data sets (ii) and (iii). none of the above

Need solving this 2nd limit problem.