Exam 6: Probability

Sampling without replacement causes the probability of randomly selecting additional cases from that population to____.

If the p(A)= p(A/B),then the two events are independent.

Each unique combination of variables in a contingency table is referred to as a:

The correspondence between the ____________________ and normal distributions improves as p gets closer to .500.

Researchers in health and advertising are interested in looking at how alternative forms of alcohol advertising are related to actual alcohol use among youth.Imagine you have conducted a study looking at the relationship between owning an item that advertises alcohol (such as a hat,t-shirt or cup with an alcohol logo on it)and having tried alcohol among a group of 12-year-olds.You observe 500 cases total.Of those 500 cases,100 have tried alcohol.For the 100 cases who have tried alcohol,32 own an item that advertises alcohol.You wish to address the following research question: Is the observation that 32 out of 100 youths who have tried alcohol own an advertising item sufficient evidence to say that these two factors are related? Convert the value of 68 to a z score.

In the use of the binomial expression for hypothesis testing,the initial assumption is that the frequency of the event will be equal to _____.

An experiment is conducted with 200 trials and the probability of a success in each trial is .250.What is the mean of the binomial distribution?

The method of sampling--with versus without replacement--never has an effect on the probability of observing some event.

If the size of the sample is small relative to the size of the population,sampling with versus without replacement will not affect probabilities appreciably.