Exam 6: Probability

A sample of 500 people aged 30 - 40 years old were interviewed to study the relationship between whether a person graduated from college or only high school and whether s/he changed jobs in the last 5 years.The results are found in the contingency table below. Answers below have been rounded to two decimal places. What is the probability that an individual has graduated from college?

A biopsychologist is interested in how quickly rats learn a complicated maze.He puts 5 rats,labeled A,B,C,D,and E,in a box.He wants to run two of the rats through a maze,one rat at a time.How many subsets of 2 rats could he choose to run through the maze if order does matter?

When two events are related,this means that one causes the other.

A researcher wanted to compare eye color distributions of babies born with a birth defect with babies who did not have the birth defect.26 babies with the defect were matched on gender,race,and age with 52 babies without the defect.The frequency of different eye colors as a function of the presence or absence of the defects was as follows: Eye Color Group Dark Medium Light Defect 1 6 19 No Defect 15 13 24 If a baby were randomly selected from the study,what is the probability of that baby having light eyes?

What type of data table is useful for calculating probabilities?

In the case of sampling _____,the outcome of the first random selection in no way affects the outcome of the second random selection.

If you have 5 questionnaires you want to hand out to a group of people,how many combinations of these 5 questionnaires,taking 3 at a time,are there?

A _____ indicates the likelihood that an event will occur given that some other event occurs.

What is the difference between a permutation and a combination?