Question 1189662
To determine the sample size needed for this study, we can use the formula for sample size estimation for proportions:

n = (Z^2 * p * (1-p)) / E^2

Where:

*   n = sample size
*   Z = Z-score corresponding to the desired confidence level (we'll assume a 95% confidence level, which gives a Z-score of 1.96)
*   p = estimated proportion of users who qualify (since we don't have any prior information, we'll use the most conservative estimate, which is p = 0.5)
*   E = margin of error (0.015, or 1.5%)

Let's plug in the values:

n = (1.96^2 * 0.5 * (1 - 0.5)) / 0.015^2
n = (3.8416 * 0.25) / 0.000225
n = 0.9604 / 0.000225
n ≈ 4268.44

Since we can't have a fraction of a customer, we always round the sample size *up* to the nearest whole number.

Therefore, Nice App Inc. would need to survey at least **4269** customers.