Difference between stratified and cluster sampling
| Stratified Sampling | Cluster Sampling |
| The population is divided into homogeneous groups called strata. | The population is divided into naturally occurring groups called clusters. |
| It is costly and time-consuming. | It is comparatively less expensive and less time-consuming. |
| It is more suitable when the units are heterogeneous. | It is suitable when the units are homogeneous. |
| Stratified sampling allows the researcher to use different sampling techniques on each stratum. | Cluster sampling does not allow use of different sampling techniques |