Exam 17: Statistics and Probability Questions

The observed value of a statistic will differ from sample to sample.This phenomenon is known as:

The percentage of data points falling at or below the upper quartile is

Use the following information for questions One thousand students at a city high school were classified both according to GPA and whether or not they consistently skipped classes.Here are the breakdowns: -What is the probability that a randomly selected student has a GPA under 2.0 given that he or she has consistently skipped classes?

Use the following information for questions -The residual associated with the observation that has a gasoline lead value of 82 metric tons and 4.5 micrograms per deciliter is in which interval below:

The test statistic for the t test for m is

A 95% confidence interval for the mean increase in sound pressure levels in pens of cattle exposed to low-level military flights was calculated to be (84.5, 108.2)decibels.Which of the following statements is true?

The scatterplot below is from an analysis of the number species of fish present and the acidity (pH)of 15 randomly selected rivers in New England.

Which of the following variables yields data that would be suitable for use in a histogram?

A study cannot be an experiment if

One of the t-procedures for making inferences about two independent populations requires that the samples are independent.Of the following, which would guarantee this independence?

Which of the following are true statements:

A type I error is made by

In a study of the foraging behavior of red-cockaded woodpeckers, males and females were observed landing on trees.A partial table of data set up for a chi-square analysis follows: If the landing location of these foraging woodpeckers is independent of gender, then the expected number of males landing on the upper trunks of trees is in what range below?

The two points to the lower left of the original plot are the two points where zero species were observed.If these points are judged to be erroneous observations and deleted from the analysis, what would be the effect of the deletion on the sample statistics and best fit line for this data?

A data set consisting of observations on two or more attributes is called a(n)

the quantity SSTr represents the

Testosterone is thought to affect the parenting behavior of male birds.In an experiment using dark-eyed juncos, nest defense behaviors of males with experimentally elevated testosterone were compared with a control group with "normal" levels of testosterone.The theory predicts that elevated levels of testosterone will result in a decrease of nest defense behavior.When nests were presented with artificial predators, the number of swoops per minute was measured. (Swooping at a predator is a common nest defense behavior.)For each group of males, the distribution of swoops per minute was approximately normal.The following table summarizes the experimental results:

By definition, a simple random sample is one such that

The P-value for a chi-squared goodness-of-fit test is