Econ Test Question?

Question

(Okay I have another question that I am just stuck on... I read my book but it doesn't explain how to do this.)

Calculate the standard deviations for test scores and interview scores as well. Using a t-test for the difference in the mean, would you conclude that the mean test score for hires is significantly higher (at the 10% level of confidence) than the test score for non-hires? Is the mean interview score for hires significantly higher for hires than for non-hires?

The mean score for all interview scores is 71.5, the mean score for all test taking is 56.25. The mean interview score for hires is 74.5 and the mean test score was 58.75. The mean score for interview for non-hires is 61.5 and test score is 45.

How do I figure out the standard deviation? Is there a formula or something?

Answer 1

You can read all about standard deviation here.

http://en.wikipedia.org/wiki/Standard_deviation

Answer 2

The question about whether the two groups are independent or related is really a question about whether the means in the two groups are independent or not. If participants were randomly assigned to the two conditions, then the groups are considered to be independent. If the two means are based on the same people, then the means are considered to be dependent. For example, if group 1 was a pretest and group 2 was a posttest and the same people responded to the pretest and posttest, then the means are considered to be dependent. Another way of saying this is as follows: means that are "between subject" means are usually independent. Means that are "within subject" are dependent. Means that are "repeated measures" are dependent means.

The scale of measurement question is answered by considering the nature of the dependent variable. Does the dependent variable meet all the rules of an interval scale? Does it only meet the rules of an ordinal scale? If the dependent variable is nominal then none of these tests may be used.

The final two questions about the distributions (shape and homogeneity) of the means in the two groups will be answered by looking at the output generated by the SPSS procedure explore.

Several examples will be given. For each example we will first determine which statistic to use by asking the four questions about the statistical assumptions. Then we will run the appropriate statistical test of the null hypothesis. Finally we will interpret the output.

Answer 3

Nope. I took both AP Economics checks interior an same 12 months, yet I paid for the checks one after the other. no longer confident about the authorities checks, yet i'm confident an same component applies. in case you look on the AP finding out schedule, each and each diverse try is going to scheduled on a quite some time period.