Exam 6: Probability

A marketing researcher at a computer company did a study examining user satisfaction with two operating systems.A total of 300 users were surveyed on the type of operating system used and their satisfaction with it.Use the following data set to answer questions 6-14: Using sampling without replacement,what is the probability of randomly selecting someone who is not satisfied with system 9,and then randomly selecting someone who is not satisfied with system 10?

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 The marginal frequencies for eye color are

The ____________________ is the competing hypothesis to the null hypothesis.

A combination of a set of objects or events is an ordered sequence.

The sum of the frequencies in the corresponding row or column of a contingency table are referred to as marginal frequencies.

In a horse race,people are allowed to bet on which horses will finish a race in positions 1,2,or 3.If the field contained 7 horses,how many ways can 3 horses finish in the three positions?

A combination of a set of objects or events is a sequence in which the internal ordering of elements is:

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.What is the probability that the biopsychologist will run rat B through the maze first and then run rat E through the maze second?

In factorial notation,the expression 3! = (3)(2)(1)= 6.

The concept of probability forms the foundation of inferential statistics as well as several descriptive statistical methods.

There are 6 students running for president at state college.The top 2 candidates are always declared winners and a run-off election is held to determine which of the two is the president.How many ways could 2 students be selected from among the first 6?

What is a joint probability?

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?

In factorial notation,the expression 6! equals:

In hypothesis testing,if observations are unlikely to be due to chance,we ____________________the null hypothesis.

The correspondence between the binomial and ____________________ distributions improves as n increases.

An event A is said to be independent of an event B if p(A)= p(B).

If we randomly select an individual from a population consisting of 60 males and 40 females,the probability of selecting a male is 60/100 = .60.

In the language of probability theory,the act of flipping a coin is called a(n)_____ and each unique outcome is called a(n)_____.

A marketing researcher at a computer company did a study examining user satisfaction with two operating systems.A total of 300 users were surveyed on the type of operating system used and their satisfaction with it.Use the following data set to answer questions 6-14: What is the probability that a person is satisfied given that they use system 10?