| Date | May Specimen | Marks available | 2 | Reference code | SPM.1.sl.TZ0.4 |
| Level | SL only | Paper | 1 | Time zone | TZ0 |
| Command term | Write down | Question number | 4 | Adapted from | N/A |
Question
Consider the following set of data which is plotted on the scatter diagram below.
Write down the coordinates of the mean point \((\bar x{\text{, }}\bar y)\).
[2]
a.
Write down the value of \(r\), the Pearson’s product-moment correlation coefficient for this set of data.
[2]
b.
Draw the regression line for \(y\) on \(x\) on the set of axes above.
[2]
c.
Markscheme
\((6{\text{, }}13)\) (A1)(A1) (C2)
a.
\(0.952\) (\(0.95202 \ldots \)) (A2) (C2)
Note: Award (A0) for \(0.9\).
b.
(A1) \(y\) intercept at \(y = 1.8\) (accept between 1 and 2)
(A1)(ft) line passes through their mean point (A1)(A1)(ft) (C2)
c.
Examiners report
[N/A]
a.
[N/A]
b.
[N/A]
c.
Syllabus sections
Topic 4 - Statistical applications » 4.2 » Pearson’s product–moment correlation coefficient, \(r \).
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