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We have a "test" and a "control" group. We calculated a market share percentage for both groups, the test group was in a market that received advertising from our client, the control group was in a market that did not see advertising. After the advertising ran, we then went back and recalculated market share for both groups. Market share for the "test" group went from 10.8% pre adversiting to 12.09% post advertising. For the "control" group, market share went from 9.48% to 9.12%. So the test group saw a .46% change in market share and the control group saw a -.36% change, how do I determine if the difference b/w .46% and -.36% is statistically significant?
Is there a difference in the extent of wound healing by treatment? (Hint: Are treatment and the percent wound healing independent?) Run the appropriate test at a 5% level of significance.
Statistically significant differences (α ≥ 0.05) between the benefits of behavioral therapy and psychoanalysis when treating an eating disorder were found.
Determine the z values for 29 and 34 hours. What percent of the garages take between 32 hours and 34 hours to erect?
If you know you need a sample size of 1,063 out of 300,000 to get a 95% confidence level and a 3% confidence interval what steps would you take to get a random sample?
Interpret a scatter diagram - Explain the relationship between the hours each student of a school spends in after school jobs each week and their grade average.
Be certain to mention what inferential statistics is and why we use it, what is random sampling, which is statistical significance and why we test it.
Attitude change is thought to result from the anxiety produced under conditions of cognitive dissonance. The data below represent the anxiety scores of subjects in a dissonance study.
At the 5% significance level, if the sample proportion is .45, and the standard error of the sample proportion is .035, the appropriate conclusion would be:
We want to test the hypothesis that the population variances are equal.
On the fictitious game show "Marginal Analysis for Everyone" the host subjects contestants to unusual tests of mental skill. On one, a contestant may choose one of two identical envelopes labeled A and B, each of which contains an unknown amount o..
Suppose that the thermometer readings are normally distributed with mean of 0° C and a standard deviation of 1.00° C. A thermometer is randomly selected and tested.
Total square footage (X4) (columns in the data file are in that order). (a) Obtain the scatter plot matrix and the correlation matrix. Interpret these and state your principal findings.
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