#include <signal.h> int main(){struct sigaction act, oldact;return 0;} dies with the message testgcc4.c: In function ‘main’:testgcc4.c:6: error: storage size of ‘act’ isn’t knowntestgcc4.c:6: error: storage size of ‘oldact’ isn’t known if I use -std…
8.3 Margin of Error 由该公式可知: To improve the precision of the estimate, we need to decrease the margin of error, E. Because the sample size, n, occurs in the denominator of the formula for E, we can decrease E by increasing the sample size. 可以通过减小Z或增大n…