To determine which experiment would best test your hypothesis, it would be helpful to clarify what your hypothesis is specifically about.
However, based on the options you've provided, here’s a brief analysis:
A. Asking friends if they also like the same type of music as you may not provide a robust test of a hypothesis since it relies on a small, potentially biased sample (your friends) and doesn’t allow for controlled variable analysis.
B. Finding other people born in the same week and asking them about their favorite type of movie could potentially yield some interesting data, but it might not directly test your hypothesis unless it is specifically related to that parameter (birth week).
C. Finding other people born in the same week and telling them about your favorite movie before asking if they liked it would help create a more direct comparison. This could be effective if your hypothesis is about a correlation between shared experiences (same birth week) and movie preferences. However, it's still subject to bias because these individuals may want to agree with you or feel influenced by your opinion.
If your hypothesis revolves around the influence of shared experiences (such as being born in the same week) on preferences, C would be the best experiment. It directly involves an interaction between the subjects and your discovery of whether they share your movie preference after you introduce your own. Always remember to refine the hypothesis to ensure that the test is specific and relevant!