The iptables packages with Fedora 7 doesn't provide you will all the goodies the kernel has to offer, 'statistic' match support being one of them. Here's how you can get them
Download the kernel and iptables source rpms from
http://download.fedora.redhat.com/p...194.fc7.src.rpm
http://download.fedora.redhat.com/p...1.3.7-2.src.rpm

Install them
rpm -ivh kernel-2.6.21-1.3194.fc7.src.rpm
Use rpmbuild to get the kernel source tree under /usr/src/redhat/BUILD
rpmbuild -bp /usr/src/redhat/SPECS/kernel-2.6.spec
Install the iptables source rpm
rpm -ivh iptables-1.3.7-2.src.rpm

Modify /usr/src/redhat/SPECS/iptables.spec. We have to modify all instances (5 of them) of KERNEL_DIR=/usr to point to the correct kernel source tree. In my case its /usr/src/redhat/BUILD/kernel-2.6.21/linux-2.6.21.x86_64 . So I change it to KERNEL_DIR=/usr/src/redhat/BUILD/kernel-2.6.21/linux-2.6.21.x86_64 . Depending on your architecture, this will be different for you but always under /usr/src/redhat/BUILD/

Use rpmbuild to build to rpms
rpmbuild -ba /usr/src/redhat/SPECS/iptables.spec

Install it
rpm -Uvh --force /usr/src/redhat/RPMS/x86_64/iptables-1.3.7-2.x86_64.rpm

To confirm if you got the 'statistic' match extension, execute
iptables -m statistic --help