520 fishes were caught and tagged. On a recent survey, 30 out of 125 fishes had been tagged. Estimate the size of the seal population.
I tried doing this but I didnt know what to put in the failure class and the failure. I m kinnda confused. Can someone plz. help?
Thanks
2007-08-19 13:54:18 · 2 answers · asked by cool :-D 1 in Science & Mathematics ➔ Mathematics
Sorry ....its not seals its fishes..
so estimate the size of fish population.
2007-08-19 14:22:03 · update #1
Based on this information.
p = proportion of tagged fishes/seals whatever
= 30/125 = 0.24
= estimate of no. of tagged / total number
If no of tagged = 520,
then the estimate for the total no. of fish
= 520 / p = 520 * 125/30
= 2167
However that's just a point estimate. If you wish to do some better statistical analysis, let's find a 95% for the proportion of tagged fish.
CI = p +/- 1.96*Sqrt(pq/n)
= 0.24 +/- 1.96*sqrt[0.24*0.76/125]
= [0.165, 0.315]
So the total no of fish can range anywhere from
520/0.315 to 520/0.165
ie we are 95% sure the total no. of fish is between
1651 and 3149
2007-08-19 14:08:27 · answer #1 · answered by Dr D 7 · 1⤊ 0⤋
How do the number of seals relate to the number of tagged fish? You didn't specify a link in your question.
2007-08-19 14:01:57 · answer #2 · answered by Northstar 7 · 0⤊ 0⤋