Exam 11: Statistics

Use the equation of the regression line to predict y when

Provided below are the sizes of 15 farms, in acres, randomly selected from the state of Oregon. The mean of this sample is 512 acres. a. Find the median of the sample and compare it to the mean and discuss the difference. b. Find the mean and the median if you throw out the 3,200 acre farm which has the largest area by far. What does this tell you?

Find the area under the normal distribution curve to the left of z = 1.95.

Construct a pie chart for the number of stray animals in a certain city.

A researcher is studying possible grade inflation at colleges. The population is .

Find the mode.

Construct a pie chart for the following information.

Find the value for the correlation coefficient r.

These data represent the number of stray dogs in a certain city for the years listed. Draw a time series graph for the data.

For the 8 test scores shown, find the percentile rank of 52.

Alice scored in the 45th percentile rank on an exam. If 400 students took the exam, how many Students scored lower than Alice?

A small company did a poll of how their employees commuted to work. Use the data to draw a pie chart.

A researcher grouped the schools by two-year state schools, four-year state schools, two-year private Schools, and four-year private schools. The researcher then decided to choose five schools from each Of those groups. Identify the sampling method used.

The exam grades of 31 students were used to obtain the frequency distribution below. Construct a histogram and frequency polygon for the data.