Exam 11: Statistics

Five hundred college graduates were asked how much they donate to their alma mater on an annual Basis. Find the mode of their responses, summarized in the table.

The table below shows the number of arrests in thousands, for the years from 2005 to 2014 in a Particular country. Find the mean and sample standard deviation for the number of arrests. Include Units.

Consider the survey question "Do you think people would live longer if they were on a diet?" Why Do you think the question is a poor one?

A researcher numbered all of the colleges willing to release grade information and chose every tenth One. Identify the sampling method used.

To study the number of credit hours taken by a typical student, Shawna asks the registrar to provide E-mail addresses for 10 freshmen, 10 sophomores, 10 juniors, and 10 seniors. From each group, she Asks for one whose student ID ends in 0, one whose ends in 1, and so forth. a. What method of Sampling did she use?

Find the variance.

A researcher randomly selected three states and then gathered information from all colleges willing To release grade information in those states. Identify the sampling method used.

These data represent the number of trees in a certain seaside town. Draw a time series graph for the data.

Fifty people participated in a poll to determine their favorite ice cream flavor. Use the data to construct a bar graph.

For the 20 test scores shown, find the percentile rank for a score of 86.

Find the equation of the regression line and predict y when x = 19.

For the 20 test scores shown, find the percentile rank for a score of 66.

If a student's rank in a class of 200 students is 22, find the student's percentile rank.

Find the equation of the regression line and predict y when

A recent study showed that eating garlic can lower blood pressure. Decide whether descriptive or Inferential statistics is being used.

Assume a data set is normally distributed with mean 129 and standard deviation 35. If the data set Contains 350 data values, approximately how many of the data values will fall within the range 59 to 199?

The average number of students in a class at White Oak University is 22.6. Decide whether Descriptive or inferential statistics is being used.

Use a scatter plot to determine the relationship between the x values and the y values.

The chance that a person will be robbed in a certain city is 15%. Decide whether descriptive or Inferential statistics is being used.

A that's large relative to the mean tells us that the data values vary pretty widely from the mean. A relatively small means that most data values are clustered fairly close to the mean.