Jack Drive wants to know the relationship between intrinsic motivation and course grade among math students. He contacts a local professor who teaches several general education math classes and asks about the possibility of gathering data in her classes. Jack is using:

simple random sampling.

cluster sampling.

convenience sampling.

systematic sampling

Answer -Convenience sampling.

Explanation

Availability Sampling convenience sampling is a non-probability sampling(non-probability sampling- All sampling units do not have an equal probability of selections). Her individuals are included are included ins sample because of their proximity and easy accessibility to the researcher

Jack Drive wants to know the relationship between intrinsic motivation and course grade among math students. Study population- Maths students from everywhere

He should probably try for math students at different levels in different locations and different universities. But he prefers to go to the local professor because it is easy to access them.

Those who lie farther away from him do not have a chance of being selected at all

Probability sampling techniques - Simple random sampling, cluster Sampling, Systematic sampling

Simple random sampling

Here every item in the population has an equal chance of being selected in the sample. Individuals are chosen entirely by chance

Eg Jack takes a list of math students from various universities in America and chooses some random bunch of students

Cluster Sampling

• Here the population is divided into groups (clusters).
• Some or all of the clusters are chosen
• Data on every individual (sampling unit) is collected from the selected clusters.

E.g. Jack collects a list of all math students in America

1. He divided them into 4 clusters- Northern, southern, western, eastern

2. He chooses 2 clusters- northern and eastern

3. He collects data from all math students in the two zones

Systematic sampling

• Here members are put in an order
• A random starting point is chosen in the target population
• Every n^th member is selected

e.g.

Jack collects a list of all math students in America.

• he puts them in alphabetic order
• the 50^th member is chosen as starting point i.e. as the first member in the sample
• then every   nth (say 10th) member is chosen to be included in the sample