Questions from Statistics Principles

Q: Based on data obtained from the CIA World Factbook, the linear

Based on data obtained from the CIA World Factbook, the linear correlation coefficient between the number of television stations in a country and the life expectancy of residents of the country is 0.5...

Q: In a study published in the Journal of the American Medical Association

In a study published in the Journal of the American Medical Association, researchers found that the length of time a mother breast-feeds is negatively associated with the likelihood a child is obese....

Q: The linear correlation between violent crime rate and percentage of the population

The linear correlation between violent crime rate and percentage of the population that has a cell phone is -0.918 for years since 1995. Do you believe that increasing the percentage of the population...

Q: On the basis of the scatter diagram below, explain what is

On the basis of the scatter diagram below, explain what is wrong with the following statement: “Because the linear correlation coefficient between age and median income is 0.012, there is no relatio...

Q: The age of a person is commonly considered to be a continuous

The age of a person is commonly considered to be a continuous random variable. Could it be considered a discrete random variable instead? Explain.

Q: Consider the following set of data: / (a

Consider the following set of data: (a) Draw a scatter diagram of the data and compute the linear correlation coefficient. (b) Draw a scatter diagram of the data and compute the linear correlation coe...

Q: Consider the following data set: / (a)

Consider the following data set: (a) Draw a scatter diagram with the x-axis starting at 0 and ending at 30 and with the y-axis starting at 0 and ending at 20. (b) Compute the linear correlation coeffi...

Q: Go to www.pearsonhighered.com/ sullivanstats to obtain the

Go to www.pearsonhighered.com/ sullivanstats to obtain the data file 4_1_49 using the file format of your choice for the version of the text you are using. The data represent the cost, return on inves...

Q: Professors Theodore Coladarci and Irv Kornfield from the University of Maine found

Professors Theodore Coladarci and Irv Kornfield from the University of Maine found a correlation of 0.68 between responses to questions on the RateMyProfessors.com website and typical in-class evalu...

Q: What does it mean to say that the linear correlation coefficient between

What does it mean to say that the linear correlation coefficient between two variables equals 1? What would the scatter diagram look like?