Exam 17: Statistics and Probability Questions

Suppose that in a certain part of the world, in any 50-year period the probability of a plague is 0.39, the probability of a famine is 0.52, and the probability of both a plague and a famine is 0.15.What is the probability of a famine given that there is a plague?

Use the following information for questions -Approximately what percentage of the variation in umbilical lead concentrations can be explained by the linear model?

Two variables are confounded if

Which of the following statements about normal curves is false?

The limitation imposed on population density by environmental factors is poorly understood.One theory is that terrestrial carnivores are particularly sensitive to the food supply.Spiders are very important species in terrestrial communities, and their survival is ecologically important.To better understand the relation between food level and spider survival, an experiment was conducted by supplementing the food supply of immature spiders in an area of low population density.In a control group of immature spiders, 83 out of 112 survived to the end of the experiment; in the food- supplemented experimental group, 76 out of 81 survived.The 90% confidence interval for the difference in population proportions is:

It is possible for a distribution to be

Which of the following is the simple linear regression model?

Which of the following indicates that an association between x and y is positive?

A television game show has three payoffs with the following probabilities:

Randomization, as a strategy in experimental design, would be unsuccessful if

The event, not A is called the ____________ of event A.

For a large sample test of the difference of two proportions to be appropriate, these assumptions must be met: Of the following, what is the smallest total of the sample sizes that would meet these requirements?

The z-score and percentile are measures of

According to Chebyshev's Rule, at least what percent of data is within 5 standard deviations of the mean?

A normal probability plot suggests that a normal probability model is plausible when:

The bias that occurs because observations were not made of all individuals selected for a sample is