Stat Ch14

2. Based on the scale of measurement for each variable listed below, which measure of central tendency is most appropriate for describing the data?

17 In regression analysis, the coefficient of determination R2 measures the amount of variation in y

The Barbie Bungee lab was conducted in order to find the association between the amount of rubber bands and the distance the Barbie bungeed. Before performing the final experiment, the group conducted an initial investigation to get data that could be analyzed to examine the comparison from the amount of rubber bands to the length Barbie was able to bungee. In the investigation rubber bands would gradually be added one by one starting at two rubber bands. Each time a rubber band was added, three trial bungees were done and the lengths the barbie dropped were recorded. Using data collected from our background investigation, the group used excel to create a sheet displaying the data in a table, a graph showing the correlation constant, the line of best fit. The line of best fit was in slope-intercept form (y=mx+b) where y represents the length of the trial average; m represents the slope

b. Dependent Variable: the variable that I am measuring (it depends on the independent variable)

22) Which statement is true of a regression line that is superimposed on the scatter plot?

1. Do you think the characteristics of feudalism help explain the later success of Western & Japanese societies?

Solutions: 1a 2c 3c 4d 5d 6c 7c 8d 9d 10a 11d 12a 13c 14c 15d 16c 17c 18b 19b 20c 21d 22a

B 7. I 8. A 9. B 10. D 11.

d. It should appear in the tail signifying a negative relationship, with .05 in that tail.

The Dietary Supplement Health and Education Act (DSHEA) is legislation that defines and classifies nutrient supplements and certain other products as foods. Check all of the ingredients that are considered dietary supplements according to DSHEA:

correlation, (c) small positive linear correlation, (d) large but not perfect negative linear correlation, (e) no correlation, (f) clear curvilinear correlation.

It couldn’t effectively deal with the tax collection, flood control, social welfare, and public security. (Original: p. 565; With Sources: p. 883)

* Correlation coefficient (R-squared) – This represents how well the independent variables (X) explain the response variable (Y).

"Correlation is a measure of association that tests whether a relationship exists between two variables. It indicates both the strength of the association and its direction (direct or inverse). The Pearson product-moment correlation coefficient, written as r, can describe a linear relationship between two variables" Correlation (n.d). As a human service professional and completing research there are advantages and disadvantages to correlational research methods, such as using correlational research it allows us to collect data and determine the strength and direction of what it is we

a. The study was designed as an experimental research by using independent and dependent variables.