Which of the following is not a measure of variability? Mode Standard deviation All of the answers on this list are measures of variability! Range A scatter plot or scatter chart can be used to identify the association between variables. According to Dr. Coy in the lecture video, if we can approximate the relationship with a line, then there is probably a linear relationship between the two variables. True False Unfortunately, if we wish to compute a table of descriptive statistics, we are forced to calculate all of our statistics using individual Excel formulas. There are no shortcuts! True False The confidencelevelin the descriptive statistics output tells us how much to add and subtract from the mean to obtain the 95% confidence interval of the mean. True False Match the clues with the answers at right. A single value of each variable at a given time, which often appears as one data row in your A . Bins B . Normal C . Time series D . Sample mean E.Observation F.Hypothesis E.
spreadsh eet. Grouping s used to determin e the intervals in a frequenc y distributi on. An example is the record of closing stock prices for Exxon for the last three years. A point estimate Comparin g P-value to the research alpha This distributi on has no skew Test Skew has to do with the direction of the longer tail of the distribution. If the skew is positive, then the longer tail points to the right. For symmetrical distributions like the normal distribution, the tails are identically sized and have, therefore, no skew. True False It is possible that two variables could have a strong non-linear correlation but have a linear correlation close to zero. True A. C. D. F. B.
False if the data exhibits a bell-shaped curve, roughly 68% of the observations will be within _____________. 3standarddeviationsof the mean. 2standarddeviationsof the mean. 1standarddeviationof the mean. 1.5standarddeviationof the mean. I know that this question is about the empirical rule, but none of the answers on this list are correct! Histogramsare used to learn about the properties of a distribution. These properties can include shape, skew and multiple modes (e.g., bimodal distribution). True False Variance and standard deviation measure the same attribute of a distribution. True False although correlations close to 1 or -1 are obviously strong, determining whether or not the correlation between two variables is strong is context specific and somewhat subjectively determined. True False Which of the following correlation statistics is the strongest? R = - 12 % R = 41 % R = - 91
End of preview
Want to access all the pages? Upload your documents or become a member.
Related Documents
MAE256 - Analytical Methods in Economics and Financelg...
|12
|1339
|190
Quantitative Analysis for Business: Survey, Histograms, Correlation and Regression Analysislg...
|7
|1178
|110
Statistical Analysis of Price and Sqrftlg...
|20
|1913
|59
What is the goal of descriptive statistics? Answer: Statisticslg...
|7
|965
|423
Statistics: Confirmatory and Exploratory Analysislg...