Final answer:
Jenny's experience with an online personality test giving different scores each time suggests the test lacks reliability, which means it does not produce consistent results over time. Validity cannot be determined without more information about the test's accurate measurement of personality.
Step-by-step explanation:
The question asked concerns reliability and validity in the context of psychological testing. If an online personality test yields different scores each time a person takes it, it indicates a lack of consistency over time, which compromises the test's reliability. Reliability refers to the ability of a test to produce consistent results when administered under similar conditions over time. An example of reliability testing is if someone takes the MMPI-2-RF today and then years later, with reliable tests yielding similar scores. However, given that Jenny gets different scores on each attempt, the test would not be considered reliable. Validity, on the other hand, refers to whether a test measures what it is supposed to measure. Without additional information about the test's ability to measure personality accurately, we cannot ascertain its validity from the information given. Therefore, based on Jenny's experience, the correct answer would be that the online personality test is not reliable, and its validity cannot be determined from the given scenario alone.