Answer:
![a. Systematic \ sampling\\b. Sampling \ Frame: \ Every \ 15^t^h \ person \ on \ line \ of \ the \ roller \ coaster](https://img.qammunity.org/2021/formulas/mathematics/college/ycluhbpyowfi0x6gpk26xf53t9qtfy88x3.png)
Explanation:
a. Systematic sampling
Reason-Every
individual will be in the sample. The
is referred to as the sampling interval.
-The sampling interval has a random start point but with a fixed, periodic interval.
-This method was appropriate given the homogeneous nature of the population.
-It is also representative given it has no bias.
b. A sample frame is the part of a population from which information is drawn.# In our sample, the sample frame is
person.
#No parts c, d as implied in the question