Soft-Shell Crab Is a Prized Dish in Many Ocean-Side Resorts

question 53

Multiple Choice

Soft-shell crab is a prized dish in many ocean-side resorts. Why are the crabs' shells soft?

• A) The crab has just molted and the new exoskeleton has not yet hardened.
• B) These species of crabs live under rocks and therefore have lost the hard exoskeleton over evolutionary time.
• C) These species have evolved a light and soft exoskeleton so that gases can diffuse directly between body of the crab and the surrounding water.
• D) These species have evolved a light and soft exoskeleton so that they can float in the water column.

---

Definitions:

Two-tail Tests

Hypothesis tests that consider extreme values in both tails of the distribution to evaluate the likelihood of observing a relationship by chance in either direction.

Likert Scale

A psychometric scale commonly used in questionnaires to represent people's attitudes, opinions, or perceptions, where responses range from one extreme to another.

Service Quality

The assessment of how well a delivered service conforms to the customer's expectations.

Significance Level

The threshold at which the results of statistical analysis are considered to indicate a statistically significant difference from the null hypothesis.