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[DOC File]Review of Basic Statistical Concepts
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Use the p-value to test the dean’s claim, against your suspicion, at the 5% level of significance. Solution: Steps 1-3 are the same as before. 4. Critical Values are not used in this approach. 5. From the sample - Standardized Test Statistic: p-value = = 0.0359 < 0.05 = , where we have used the fact that the test is . …
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[DOC File]Statistics Cheat Sheet
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P-value: probability, assuming Ho is true, that test statistic would be as or more extreme (smaller P-value is > evidence against Ho) z = Significance level α : if α = .05, then happens no more than 5% of time. "Results were significant (P < .01 )" Level α 2-sided test rejects Ho: μ = μo when uo falls outside a level 1 – α confidence int.
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[DOC File]Exam 3 Practice Questions
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The large-sample confidence interval formula for proportions is valid if np ≥ 15 and n(1-p) ≥ 15. Large-sample confidence intervals always contain the true parameter value, whereas small-sample confidence intervals may not. We form small-sample confidence intervals by using the large-sample formula after adding 4 successes and 4 failures.
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[DOC File]Hypothesis Testing: - Dept. of Statistics, Texas A&M ...
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Confidence interval only tells us that there is no difference between those brands. Alternative method is the confidence interval. versus . test statistics, =1.90 < t(;n-1 = t0.01;7 =2.998 then fail to reject H0. Or versus . test statistics, =1.90 > - t(;n-1 = -t0.01;7 = -2.998 then fail to reject H0.
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[DOC File]Section 1
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Construct a confidence interval for the difference between two population proportions. Perform a significance test for the difference between two population proportions. Vocabulary: None new. TI-83 Calculator Help: 2 Sample t-Test and Confidence Interval. If you have raw data: enter data in L1 and L2. Press STAT, TESTS, select 2-SampT-Test
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[DOC File]Statistics for Geography and Environmental Science ...
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Commonly the null hypothesis is only rejected if p is less than 0.05 or, for more confidence in the decision, less than 0.01. For sample A, the test score is t = 2.2638 with 99 degrees of freedom and the probability this is 'due to chance' is p = 0.02577.
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[DOCX File]Microsoft Word - Chapter 3 TEST
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In a statistics course, a linear regression equation was computed to predict the final exam score from the score on the first test. The equation was ŷ = 10 + .9x where y is the final exam score and x is the score on the first test. Carla scored 95 on the first test. What is …
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[DOC File]AP Statistics - edventure-GA
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11. A teacher asked her 8 introductory statistics students to record the total amount of time they spent studying for a particular test. The amounts of study time x (in hours) and the resulting test grades y are given below. x 2 1 1.5 0.5 1 3 0 2. y 92 81 84 68 85 96 48 74 (a) Make a scatterplot of the data.
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[DOCX File]Statistics
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Paired T- test. C, Both a and b are correct. Skewness is positive. 6.04 (exp 1.8) A. There does not appear to be significant correlation. T test for difference in means. T test for difference in means. Regression. Paired T test. Dummy regression. B as it is two sided. A. C. The 95% confidence …
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[DOC File]CHAPTER 9—HYPOTHESIS TESTS
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a. Develop the appropriate hypotheses for this problem. b. Compute the test statistic. c. Compute the p-value. d. Using the p-value approach at 95% confidence, test the above hypotheses. e. Using the critical value approach at 95% confidence, test the hypotheses. ANS: a. Ho: 1000. Ha: 1000 b. 1.60 c. 0.1096 d.
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Statistics confidence test