Quantization Error Analysis

Errors due to rounding signals to the nearest quantization interval are easy to predict and are usually modeled as a sum of two or three sinusoids.

Let $e_q[n]$ be the difference or error between the original signal and the quantized signal and $\Delta$ be the smallest interval between quantized values of the signal. Which of the following statements are correct for the model of $e_q[n]$ described in the lecture? Select all that apply.

If the number of bits used to quantize a signal is increased from 14 bits to 16 bits and all else remains the same, what happens to the quantization noise power?