The temperature of water in a kettle is $w$ °C at time $t\,$ minutes after boiling. A regression model fitted over the first 20 minutes is $log_{10}w=1.99-0.031t$ .

Express the model in the form $w=ab^t$ , giving $a\,$ and $b\,$ to 3 significant figures.

Interpret $a\,$ in context.

Explain why the model is unlikely to be reliable after 60 minutes.

The temperature of water in a kettle is $w$ °C at time $t\,$ minutes after boiling. A regression model fitted over the first 20 minutes is $log_{10}w=1.99-0.031t$ .

Express the model in the form $w=ab^t$ , giving $a\,$ and $b\,$ to 3 significant figures.

Interpret $a\,$ in context.

Explain why the model is unlikely to be reliable after 60 minutes.

2 Statistics

Question 162

Markscheme

2 Statistics

Question 162

Markscheme

2 Statistics

Question 162

2 Statistics Questions

2 Statistics

Question 162

2 Statistics Questions