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[DOC File]The first table, (Group Statistics) shows descriptive ...
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comparing the obtained t statistic value (tobt = 2.430 for our example) to the t critical value (tcv). Knowing that we are using a two-tailed (non-directional) t test, with an alpha level of 0.05 (( = 0.05), with df = 28, and looking at the Student’s t Distribution Table – we find the critical value for this example to be 2.048.

[DOC File]8 - Faculty Websites
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The t-distribution is “flatter” and has “heavier tails” than the N(0,1) distribution. As the sample size increases, the t-distribution approaches the N(0,1) distribution. Example. Find the critical t value for =0.05 with d.f. = 16 for a right-tailed t test. Solution. Find the 0.05 column in the top row and 16 in the left-hand column.

[DOC File]MTH 265 – Statistics for Scientists and Engineers
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Find it under the 2 sample T-Test. Be able to calculate the test statistic, which is a t-value in this case. Be able to compute the P-value and be able to write out the probability statement for the P-value that involves the test statistic. Know when to pool the sample standard deviations.

[DOC File]Stat 95 SPSS Assignment
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Report the Means, SD, the t statistic and p value. Calculate a 95% Confidence Interval. Calculate the effect size. Dr. Vallerga and Dr. Ligda are interested in the effects of cell-phone use while driving on the number of driving errors (e.g., running red lights, failing to maintain a safe distance between other cars, slowed reaction time). The ...

[DOC File]Hypothesis Tests in Multiple Regression Analysis
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Test Statistic: which is NOT found on the regression printout. You will, however, find bj and s{bj} on the printout. Sampling Distribution: Under the null hypothesis the statistic follows a t-distribution with n - p degrees of freedom. Reject in the upper or lower tail of this distribution, making the appropriate adjustment for one-sided tests.

[DOC File]Chapter 7: Inference for Means
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The two-sample t statistic is. We find the P-value by comparing 0.654 to critical values for the t(132) distribution and then doubling p because the alternative is two-sided. Table D (for 100 degrees of freedom) shows that 0.654 does not reach the 0.25 critical value, which is the largest entry for p in this table.

[DOC File]“One Sample Inference on Means” Test
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13) Which of the calculated values of a test statistic would have the smallest p-value? a) z = 3.05 b) t = 3.05; df = 10 c) t = 3.05; df = 15 d) t = 3.05; df = 30. 14) Insurance companies estimate that the average weight of cars currently used in the U. S. is 3000 pounds. A random sample of 91 cars had a t-test statistic of -1.452.

[DOC File]CHAPTER 2
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Accordingly, the appropriate test statistic is based upon the t-distribution: To find the calculated value of the test statistic based upon this sample, we note the following information: Sample Mean = 7.25, 0 = 7.01, s = 2.51, and n = 400.

[DOC File]Chapter 7: Inference for Means
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Because the degrees of freedom are n-1=7, this t statistic has the t(7) distribution. Figure 2 The P-value for Example 2. Figure 2 shows that the P-value is 2P(), where T has the t(7) distribution. From Table D we see that P()=0.0005. Therefore, we conclude that the P-value is less than .

[DOC File]1 .edu
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one-sample t statistic. has the . t distribution. with n-1 . degrees of freedom. Degrees of freedom. There is a different t distribution for each sample size. A particular t distribution is specified by giving the degrees of freedom. The degrees of freedom for this t statistic come from the sample standard deviation in the denominator of t ...

[DOC File]1) (Chapter 10) Given the following t-statistics (23 ...
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the t-distribution should be used to get a test statistic equal to 3.18 . the z-distribution should be used to get a test statistic equal to 3.18. not enough information is given to calculate the test statistic. a pooled variance t-test should be used. Based on a 95 % confidence interval, if you tested Ho: ( = 70, H1: ( ( 70, you would:

[DOC File]Statistics 300
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c. Reject if the test statistic is greater than 1.96 or less than -1.96. d. Reject if the test statistic is greater than 2.33 or less than -2.33. 22) You wish to test the claim that 22 at a level of significance of= 0.01 and are given sample statistics n = 40, = 23.8, and s= 4.3. Compute the value of the test statistic.

[DOC File]STANDARD ERRORS, 't' STATISTICS,
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For a two-sided test, find the column corresponding to /2. and reject the null hypothesis if the absolute value of the test statistic is greater than the value of in the table below. Upper critical values of Student's t distribution with . degrees of freedom. ν \ α 0.40 0.25 0.10 0.05 0.025 0.01 0.005 0.0005 1

Find the t statistic