Alpha-significance level

The problem with defining criteria for such a test is that it depends on the j8 probability, which is difficult to determine (although we could arbitrarily specify a value, such as 95%). It also depends on the smallest difference you need to detect, the number of samples, the variability of the data (which at least can be determined from the data, the same way it is done for determining a), and the probability of detecting the given difference at a specified alpha- significance level. 

This PROC TTEST runs a two-sample f-test to compare the LDL change-from-baseline means for active drug and placebo. ODS OUTPUT is used to send the p-values to a data set called pvalue and to send the test of equal mean variances to a data set called variance test. The final pvalue DATA step checks the test for unequal variances. If the test for unequal variances is significant at the alpha =. 05 level, then the mean variances are unequal and the unequal variances p-value is kept. If the test for unequal variances is insignificant, then the equal variances p-value is kept. The final pvalue data set contains the Probt variable, which is the p-value you want. 

The cherry tree Prunus avium L.) is a member of the Rosaceae family. Cherry seed contains about 18% oil on a dry weight basis (48). Significant levels of oleic acid were detected in the cherry seed oils prepared by hexane extraction using a Soxhlet apparatus. Oleic acid comprised 24—38% of the total fatty acids from three different varieties of cherry fruits (Table 7) (48). Linoleic acid was the major fatty acid in the cherry seed oil, and ranged 40 9% in the seed oil, along with ot-eleostearic (18 n-5), palmitic, stearic, arachidonic, and ot-linolenic acids (Table 7). alpha-eleostearic acid comprising 10-13% of cherry seed oil, is a conjugated... 

This drug produces significant reduction in pressure with little attenuation by cardiac reflexes. Of the drugs presented, an a, antagonist would be the most likely candidate, as vascular diameter is increased, causing a significant decrease in pressure. Compensatory reflex sympathetic activity is blocked at the alpha-receptor level, leaving an increase in cardiac output as the major compensatory factor. 

Additive Law of Probability n See Additions Rule. Alpha Level n The alternate name for the significance level. Alternative Hypothesis n The alternative or negation of the null hypothesis in hypothesis testing. It is normally symbolized by Hj. 

Significance Level n Also known as the level of significance, alpha level, or the probability of type I error and is often represented by ol The significance level is the probability of rejecting the null hypothesis when it is... 

IMI 550 is an alpha-beta titanimn alloy of medium strength with a typical ultimate tmisile strength of 1100 MPa (159 ksi) and temperature capability up to about400 °C (750 °F). The alloy derives its properties om solid solution strengthening and age hardening. Because of the significant level of beta stabilizer content, IMI 550 exhibits a useful aging response in sections up to 150 rmu (6 in.) thick. 

One-way RM ANOVAs using the techniques as the independent variable were conducted to analyze questionnaire results. Bonferroni corrections were used for multiple comparisons and Greenhouse-Geisser corrections were used when sphericity could not be assumed. For the purpose of the analyses, data were recoded such that greater numbers are better. To account for experiment-wise alpha inflation, effects with significance levels above. 003 (.05/17) should be interpreted with caution. 

In addition to these formal studies of human error in the CPI, almost all the major accident investigations in recent years, for example, Texas City, Piper Alpha, the Phillips 66 explosion, Feyzin, Mexico City, have shown that human error was a significant causal factor at the level of design, operations, maintenance or the management of the process. 

You see that all 80 patients have their mortality status reported and that just by scanning the frequency tabulation you can tell that more subjects receiving treatment a have died. You also see from the chi-square p- value of 0.0333 that treatment a has significantly more deaths at an alpha level of. 05. 

The main problems of the study of chromosome aberrations, caused by radon and daughters at their most frequently existing dose levels, i. e. boardering the natural burdens, ares (i) to get statistical significance at very low doses, and (ii) to study their induction by internal exposure to alpha emitters only. 

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