Tuples are ordered collections designed for values that should remain unchanged after creation. They are well suited to fixed records such as coordinate pairs.
Immutability means an existing string object cannot be changed character by character. A new string must be created instead of modifying the original one in place.
Correct Answer: C. A variable name can later refer to an object of a different type
Explanation:
Python determines types at runtime based on the objects to which names are bound. The same name may be reassigned from an integer to a string or another object type.
Correct Answer: A. It translates and executes Python instructions
Explanation:
The Python interpreter reads Python code and carries out the specified operations. It enables interactive execution as well as running complete scripts.
Correct Answer: D. The procedure would capture the true parameter in about 95% of repeated samples
Explanation:
The confidence level describes the long-run success rate of the interval-construction method. It does not state that 95% of individual observations fall within the interval.
Correct Answer: D. It tends to approach the true parameter as sample size grows
Explanation:
Consistency is an asymptotic property: increasing data makes the estimator concentrate near the true value. It does not require exact correctness in every finite sample.
Correct Answer: A. Its expected value equals the true population parameter
Explanation:
Unbiasedness means that repeated sampling would center the estimator’s values on the true parameter. An unbiased estimator may still vary substantially from one sample to another.
Underfitting occurs when a model is too simple to capture the important structure in the data. Poor performance on both seen and unseen data is a common sign.
