Exam 11: Statistics

Forty new automobiles were tested for fuel efficiency by the Environmental Protection Agency (in Miles per gallon). The individual values and a frequency distribution are displayed below. Use the frequency distribution to approximate the mean.

A sample is a .

Find the equation of the regression line.

Find the area under the normal distribution curve between z = 0.65 and z = 2.30.

Provided below are the sizes of 15 farms, in acres, randomly selected from the state of Oregon. Find The mean area for these 15 farms.

To obtain the frequency distribution below, twenty-three babies were monitored for how many times they cried during the night. Construct a frequency polygon for the data.

In order to obtain a sample, every subject of the population has to have an equal chance of being selected.

Construct a bar graph for the following information.

Twenty-five people responded to a questionnaire about what types of pets they had. Construct a frequency distribution for the data (D = dogs only, C = cats only, B = both,N = neither).

Fifty ten-year-olds were monitored to determine the number of hours per week they spent watching television, surfing the net, and playing video games. The results were used to obtain the frequency distribution below. Construct a histogram for the data.

A sample is taken by numbering each member of the population and then selecting every kth member, where k is some natural number.

A stats instructor has recorded the scores of a recent quiz worth 20 possible points below. a. If he wanted to be a jerk and tell his students the average on the quiz was terrible, which measure of average is he likely to use? Give that value in your explanation. b. If he wanted to be a great guy and tell them the average on the quiz was fantastic, which measure of average is he likely to use? Give that value in your explanation

Find the mode.

Forty new automobiles were tested for fuel efficiency by the Environmental Protection Agency (in miles per gallon). The individual values and a frequency distribution are displayed below. Find the median, mode, and midrange of the data set.

Consider the survey question "Are you in favor of a national health program and do you think it Should be subsidized by a special tax as opposed to other ways to finance it, such as a national Lottery?" Why do you think the question is a poor one?

Draw a scatter plot and describe the relationship.

Match each value of r with the appropriate graph.

Use the equation of the regression line to predict

The table shows the number of class periods missed over the last 10 courses by two students. Without doing the calculations, how do you think the standard deviations compare for the two students? Explain.

Find the value for the correlation coefficient r.