Paper 6 October/November 2011 MATHEMATICS (9709/61) A Levels
لطفا برای اطمینان از عملکرد و تجربه بهتر از مرورگرهای مدرن و به روز مانند کروم یا فایرفاکس استفاده کنید.

A clinic monitors the amount, $X$ milligrams per litre, of a certain chemical in the blood stream of patients. For patients who are taking drug $A$, it has been found that the mean value of $X$ is $0.336$. $A$ random sample of $100$ patients taking a new drug, $B$, was selected and the values of $X$ were found.
The results are summarised below.
$n = 100$, $\sum x = 43.5$, $\sum {{x^2}} = 31.56$.
a) Test at the 1% significance level…