Question

Whelks and mussels The small round holes you often see in seashells were drilled by other sea creatures, who ate the former dwellers of the shells. Whelks often drill into mussels, but this behavior appears to be more or less common in different locations. Researchers collected whelk eggs from the coast of Oregon, raised the whelks in the laboratory, then put each whelk in a container with some delicious mussels. Only$9$ of $98$ whelks drilled into a mussel.

Short answer

The conditions which are not satisfied are random sample and large count.

Step-by-step solution

Given Information

It is given that $n=98$

The population is of all whelks.

Explanation

• Selection of whelk eggs is done from coast of Oregon. Hence, whelk does not represent all whelk eggs which is not random sample. Condition of random sample is not met.
• $98$whelks is less than$10\%$ of all the whelks. Condition is satisfied.
• Number of success is $9<10$and failures are $98-9=89\ge 10$. Hence condition success and failure should be $\ge 10$is not satisfied.

Therefore, condition for confidence interval is not met.