Question

I have two numerical variables that I have graphed in a scatterplot. I notice that as values of the x variable get larger, values of the y variable get smaller. Which of the following is true regarding the relationship between these two variables?

		Their correlation is equal to or close to 0
		Their correlation is less than 0
		Their correlation is greater than 0

A pharmaceutical company produces an at home pregnancy test. They conduct regular samples to track how many people test positive/negative and how many people are actually are/are not pregnant. They report that of the people who tested positive, 99.9% were actually pregnant. What type of probability is this?

		Simple/marginal
		Joint
		Conditional

Cosco is running a lottery where one student will be selected to receive a free iPhone. The marketing department knows that out of the 2,000 students registered for the lottery, 250 of them are marketing majors. The marketing department says that the probability of a marketing major winning the iPhone is 12.5%. What type of probability is this?

		Classical (a priori)
		Empirical
		Subjective

Answer 1

I have two numerical variables that I have graphed in a scatterplot. I notice that as values of the x variable get larger, values of the y variable get smaller. The correlation is less than 0(ans)...as this is negative correlation

They report that of the people who tested positive, 99.9% were actually pregnant. This is conditional probability. .(ans)

Clearly this is subjective probability...(ans)

Subjective probability is a type of probability derived from an individuals personal judgement or own experience about specific outcome likely to occur..

Note-if there is any understanding problem regarding this please feel free to ask via comment box..thank you