Explain how and when the rule of multiplication and the rule of addition can be used to determine the probability of an event. Explain why Mendel was wise to use large sample sizes in his studies.

Addition used for 'either or' events , Multiplication used for 'and' events

Explanation:

Addition is used when Probability is of 'one event or other event'

Multiplication is used when Probability is of 'one event & other event'

Ex : Probability of A winning = 0.4

Probability of B winning = 0.3

Probability (A or B winning) = 0.4 + 0.3 = 0.7

Probability (A & B winning) = 0.4 x 0.3 = 0.12

evidence and logical support is essential for a scientist to do in order to maintain credibility. this is because no one can believe without any logic and without any evidence.hence a scientist can maintain credibility by proving himself and by answering logically so experiments prove very beneficial. logical hypothesis give conclusion which is acceptable. therefore, there are two main factors to maintain credibility by a scientist is evidence and logical support.