Questions: Select the correct answer. A veterinarian is interested in the average number of pets her clients own. Over the course of a month, she questions each client she meets with and records their responses. The veterinarian calculates the average and draws a conclusion from her data. What kind of statistical study did the veterinarian conduct? A. theoretical study B. survey C. observational study D. experiment

The answer is C: observational study.

Explanation for each option:

A. Theoretical study: This option is incorrect. A theoretical study involves developing theories or models based on existing knowledge and does not involve collecting new data from subjects.

B. Survoy: This option is incorrect, and it appears to be a misspelling of "survey." However, even if it were spelled correctly, a survey typically involves collecting data through questionnaires or interviews, which is not explicitly mentioned in the scenario.

C. Observational study: This option is correct. An observational study involves collecting data by observing subjects without manipulating any variables. In this case, the veterinarian is observing and recording the number of pets her clients own without influencing or altering any conditions.

D. Experiment: This option is incorrect. An experiment involves manipulating one or more variables to determine their effect on other variables. The veterinarian is not conducting any manipulations or interventions, so this is not an experiment.