Home Work 7.4-5
Each of the inner and outer radii of a circular ring, as
shown in the following figure was measured five times
with the following readings in cm:
Outer radius, $r_o$, cm
2.5 2.4 2.6 2.4 2.5 0.10
Inner radius, $r_i$, cm
1.6 1.5 1.6 1.4 1.4 1.5 0.10
Area, $cm^2$
11.59 11.02 13.19 15.07 11.93 12.56 1.61
With 90% confidence, determine the standard error of
the estimated area. (Ans. 1.53 $cm^2$)
Area A
