elearning.kbs.edu.au/mod/quiz/attempt.php?attempt=135173&cmid=319910&page=4 A researcher, wanted to understand the linear relationship between household annual water bill ($), the number of people per household and the capacity of a backyard water tank (litres) of that household. Only households with water tanks were sampled. They took a random sample and used Excel to create the following regression output. SUMMARY OUTPUT Regression Statistics Multiple R 0.856 R Square 0.734 Adjusted R Square 0.657 Standard Error 1390.792 Observations 10 ANOVA of SS MS Significance F Regression 37276493.84 18638247 9.636 0.010 Residual 13540116.16 1934302.3 Total 50816610 Coefficients Standard Error t Stat P-value Lower 95% Upper 95% Intercept -12.636 721.713 0.018 0.987 -1719.216 1693.945 People per household 531.258 122.887 4.323 0.003 240.677 821.838 Backyard water tank capacity (litres) 0.280 0.114 -2.453 0.044 -0.550 -0.010 a) Write down the regression equation. b) Interpret the coefficient of backyard water tank capacity. c) Using the 1% significance level, test whether this is a significant negative linear relationship between annual water bill and backyard water tank capacity; give hypotheses, your reasoning, decision, and conclusion. A BIE Any text entered here will be displayed in the response innut box when a new attempt at the questi MacBook Air 20 G DII E8 @ % W# N 4 5 6 8 9 Q W E R T Y U O A S D F G H K Z X C V CO N M