What does p value say about means
[DOC File]Inference Guidelines - Sayre School
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No, it does not nesscarily support the research hypothesis. Rejecting the null only means there is an effect not what kind of effect. The hypothesis could have been the null or the effect could be opposite of what was hypothesized. For example if an correlation study has a p value less than .05 and a r of -.125.
[DOC File]CHAPTER 1
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44. Give the p-value for #42 and say what it means in everyday terms. 45. Can we prove at the 5% significance level that the average age of students at a certain university is less than 24 years? Data: a SRS of 17 students with a sample mean age of 22.8 years and a sample standard deviation of 3.1 years.
[DOC File]Names
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p-value = 0.1814. p-value is not less than alpha. So, we fail to reject Ho. 61. B The assumptions of the hypothesis test for a proportion are the data must be categorical, data must come from a random sample, np> 15 and n(1-p)> 15.
[DOC File]Exam 3 Practice Questions
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Of est. P-Value Assumptions 2 sample t for diff. in means To compare 2 pop’s, groups, treatments that . are independent smaller n minus 1 0 P(T < t) P(T > t) Ind. SRS’s. Both pop’s Normal: Check. instead of n. (draw both boxplots) 2 prop z test Compare 2 proportions NA
[DOC File]Confidence Intervals and Hypothesis Testing
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A large p-value means that there is a good chance that the relationship is statistically significant. If the two variables are not related in the population, then less than 5% of the samples you could ever take would give you a test statistic of 3.84 or larger.
[DOC File]Chapter 7: Inference for Means
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Since the p-value > , the mean battery life is not equal to 4.5 hours. Since the p-value > , there is insufficient evidence to say the mean battery life is not equal to 4.5 hours. Since the p-value > , there is insufficient evidence to say the mean battery life is less than to 4.5 hours.
[DOC File]A group of files in a medical clinic classifies the ...
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What does the p-value say about the plausibility of the null hypothesis? 3) So far, we have tested one mean, one proportion, two means and two proportions. The next step (perhaps obviously) is to test three or more means. This test is called an . ANOVA
P-Value Definition
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. The P-value …
[DOC File]Respond to and describe the statement, 'Rejecting the null ...
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The general rule is that a small p-value is evidence against the null hypothesis while a large p-value means little or no evidence against the null hypothesis. So the sample mean is 3.01 standard deviations from the hypothesized population mean.
[DOC File]“One Sample Inference on Means” Test
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The p-value = P(x-bar < 4.9) = 0.0002 is very low which means x-bar = 4.9 is inside the tail. It’s not very likely to observe a sample mean of 4.9 or lower when the mean of the population is 5.25. Such a sample mean would be more likely when mu is lower than 5.25. What does the p-value mean:
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