I just thought that doing this:
for(int x=0;x<5;x++)EEPROM.write(index+x,sensval[5]); would work but I am getting readings that don't seem to make sense.
The EEPROM write tutorial example(on Arduino site) doesn't address this,( I guess because only one analog sensor value is used? well I guess in a sense that example does because the readings are divided into four so they will fit into a byte.