Probability and Contingency tables

[gooses34]

Here is my question from table chart below as i ma getting a little confused with the AND/OR

Question: Of getting someone who would want his/her employer to offer free use of a tablet computer AND someone who works in the manufacturing sector?

	Smart phone	Wireless business projector	Tablet computer	Total
Workers in manufacturing sector	1685	1329	2127	5141
Workers in the service industry	1235	2272	1116	4623
Total	2920	3601	3243	9764

 

[Jameson]

Hi goose34,

Welcome to MHB! :)

I think the question you are asking is what is the probability of someone using a tablet computer and working in the manufacturing sector? Is that correct?

How many people fit both conditions? How many people could possibly fit both?

 

[gooses34]

Well its a quiz and this is what it says

We- Compute magazine did a survey of 9764 working people. They were asked these two questions.A. Do you work in the manufacturing sector or service industry?
B. If your employer were to offer you free use of one type of smart technology, which one would be most helpful to you at your job?The responses were put into the table you fixed for me.

And the question was

8) Of getting someone who would want his/her employer to offer free use of a tablet computer AND someone who works in the manufacturing sector... thought it was 2127/9764

9) Of getting someone who would want his/her employer to offer free use of a tablet computer OR someone who works in the manufacturing sector? ... I thought it was 1116+5142/9764

Thanks

 

[Jameson]

If this is a current quiz you are taking for credit, than we can't help you. I'm sorry but unless we know that your teacher is ok with you receiving outside help then from our point of view we might be helping you cheat. If you are allowed to get help or this is for a past quiz or something, please let me know.

Please let me know what the situation is. While you think it over, this website might be helpful. It provides some examples of using contingency tables and probabilities.

 

[gooses34]

Well it's not really a quiz its a question that i didn't understand that's all

 

[Jameson]

Your calculation for the "and" condition is correct. It must match both criteria and we divide by the total.

For "or", the phrasing of the question is a bit unclear but it must meet either condition in order to be counted. Which cells meet at least one of those conditions? There are more than two. Anyone who works in the manufacturing industry or wants a tablet qualifies. We can count this a couple of ways but let's start with this.