Skip to content

Course home

Sign up

2 Statistics

EasyMediumHard
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212
Question 199

For positive variables x x\,x and yyy, the correlation coefficient between x x\,x and log⁡10y\log_{10}ylog10​y is 0.980. The regression line is log⁡10y=2.60+0.127x\log_{10}y=2.60+0.127xlog10​y=2.60+0.127x.

a.

Explain why the value 0.980 supports an exponential model for y y\,y in terms of xxx.

[2]
b.

Find the model in the form y=abxy=ab^xy=abx, giving a a\,a and b b\,b to 3 significant figures.

[3]
Markscheme

2 Statistics Questions

  1. A Level
  2. /Maths
  3. /2 Statistics

Question bank