P value below 0

    • The Correct Interpretation of Confidence Intervals

      groups contains the value 0, this means that the p-value will be greater than 0.05. Conversely, if the 95% CI does not contain the value 0, then the p-value will be strictly less than 0.05. The same applies when comparing groups using a ratio, such as an odds ratio or risk ratio. When using a

    • [PDF File]6. Significance tests - University of Florida

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      When H 0 is true, the sampling dist of the t test statistic is the t distribution with df= n - 1. • P-value: Under presumption that H 0 true, probability the test statistic equals observed value or even more extreme (i.e., larger in absolute value), providing stronger evidence against H 0

    • [PDF File]HW2 - pval practice - KEY - Anderson 5

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      State whether the null hypothesis should be rejected on the basis of the given P-value. = 0.258, a -0.05 (.258) (.05) = 0.0684, a -0.10 P-val ( .01'") 4 d ( 10) P-value = 0.0153, a -0.01 P-value = 0.0232, a -0.05 P -Val ( .02) d (.05) Ho P-value = 0.002, a -0.01 p-val (.Ø2) Find the p-value for the given the given hypotheses and z-scores. -

    • [PDF File]Hypothesis Testing - Duke University

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      Step 3. Determine the p-value. Recall the alternative hypothesis was one-sided. p-value = proportion of bell-shaped curve below –2.27 Exact p-value = 0.0116. Step 4. Make a decision. The p-value of 0.0116 is less than 0.05, so we conclude that the proportion of American adults in 1994 who believed Bill Clinton had the honesty and integrity they

    • [PDF File]Allele Frequencies and Hardy Weinberg Equilibrium

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      frequencies have been estimated to be P(A)=0.2877, P(B)=0.1065 and P(O)=0.6057. If an individual has blood type B, what gametes can be produced and with what frequency? (Note where HWE is invoked in the following) If a person has blood type B, then the genotype is BO or BB.

    • [PDF File]Hypothesis Testing for Proportions

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      p-value approach: Compare the probability of the evidence or more extreme evidence to occur when null hypothesis is true. If this probability is less than the level of significance of the test, α, then we reject the null hypothesis. (Reject H 0 if p-value < α) p-value = P(Z ≤−1.09 or Z ≥1.09)

    • [PDF File]Chapter 2 Answers

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      Computer output for a random sample of data is shown below. Some of the quantities are missing. Compute the values of the missing quantities. Variable N Mean SE Mean Std. Dev. Variance Minimum Maximum ... A-Squared 0.33 P-Value 0.435 Mean 10.952 StDev 1.993 Variance 3.974 Skewness -0.45131 Kurtosis -1.06746 N 10 Minimum 7.750 Anderson-Darling ...

    • [PDF File]P and q values in RNA Seq - Clark Science Center

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      tests will produce a p-value. The p-values take on a value between 0 and 1 and we can create a histogram to get an idea of how the p-values are distributed between 0 and 1. Some typical p-value distributions are shown below. On the x-axis we have histogram bars representing p-values. Each has a width of 0.05 and so

    • [PDF File]Sample questions: EXAM 2 - University of Florida

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      Calculate the test statistic, and indicate whether the P-value was below 0.05, based on using the appropriate table. c. Make a decision, using = .05. Interpret. ... P-value = 0.002. Very strong evidence against null and in favor of the alternative the more people in the population answer it correctly than due to chance.

    • [PDF File]Comparison of Means Solutions 1. True or False: A p-value ...

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      t=3/(0.5) = 6 c. True or False: We should calculate a z-statistic. False. See above. d. Calculate the p-value and compare to an alpha level of 0.05 to draw your conclusions. By looking up the p-value on a t-distribution table, with 99 degrees of freedom (will probably need to look up 100 df), we find a p-value p(t>6)

    • [PDF File]TABLES OF P-VALUES FOR t- AND CHI-SQUARE REFERENCE ...

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      calculate, and can even give upper tail areas (which are often equivalent to or components of a required P-value). Nonetheless, ... below, P-values are given for upper tail areas for central t- and 2- ... 1.30 0.209 0.162 0.142 0.132 0.125 0.121 0.117 0.115 0.113 0.111 0.110 0.109

    • [PDF File]Probability distributions - University of Notre Dame

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      1/8 if x = 0 P(x) = III. Continuous random variables. ... This is seen easily if it is recalled that F(b) is the probability that X takes on value b or below, F(a) is the probability that X takes on value a or below; their difference must be the probability of a value between a and b.

    • [PDF File]Scatterplots and Correlation - University of West Georgia

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      The value of p for which a correlation will be considered statistically significant is called the alpha level and must be reported. SPSS notation for p values: Sig. (2 tailed) In the previous example, r = 0.62 and p-value = 0.03. The p-value of 0.03 is less than

    • [PDF File]Interpretation of Alpha and p-Value March 2017

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      shown in Figure 2. The maximum p-value was 0.982. The minimum p-value was 0.004. Quite a range when taking 20 random observations from the same population. The distribution of the p-values is shown in Figure 3. Figure 3: Distribution the p-value for 100 Random Samples Almost looks like a uniform distribution. Well, it turns out it is. With ...

    • [PDF File]How to Read Standard Normal Table - University of Toronto

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      Example 8: Find probability that Z is below 0.72, or P(1 < Z < 0:72). This is not given directly by our table but we know that P(1 < Z < 0) = 0:5 and from the table P(0 < Z < 0:72) = 0:2642. So, total probability equals to 0.5+0.2642=0.7642. Type 2 What I refer to as Type 2 questions are the problems when you are asked to nd z A rather than ...

    • [PDF File]Hypothesis testing Exercises - Kennesaw State University

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      given below. Brand X Brand Y n = 35 n = 40 ... The P-value of 0.1423 is greater than the alpha level of 0.10. 8) 9) The U.S. Department of Labor and Statistics released the current unemployment rate of 5.3% for the month in the U.S. and claims the unemployment has not changed in the last two months. However, the states statistics reveal that ...

    • [PDF File]Standardized Infection Ratio (SIR) Table

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      • The SIR p-value is a statistical measure that tells you if the observed number of infections is significantly different from what was expected. A p-value less than 0.05 (an arbitrary and conveniently used cut point) indicates that the number of observed CLABSIs is statistically significantly different (higher or lower) from the number expected.

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