TY - JOUR

T1 - Introduction to biostatistics

T2 - Part 4, statistical inference techniques in hypothesis testing

AU - Gaddis, Gary M.

AU - Gaddis, Monica L.

PY - 1990/7

Y1 - 1990/7

N2 - Statistical methods used to test the null hypothesis are termed tests of significance. Selection of an appropriate test of significance is dependent on the type of data to be analyzed and the number of groups to be compared. Parametric tests of significance are based on the parameters, mean, standard deviation, and variance, and thus are used appropriately when interval or ratio data are analyzed. The t-test and analysis of variance (ANOVA) are examples of parametric tests of significance. Assumptions regarding the data to be analyzed when using the t-test or ANOVA include normality of the populations from which the sample data are drawn, homogeneity of the variances of the populations from which the sample data are drawn, and independence of the data points within a sample group. The t-test is the appropriate test of significance to use if there are only two groups to compare. If there are three or more groups to compare, ANOVA is the appropriate test. ANOVA holds the preset α level constant. While ANOVA will imply a significant difference between the groups compared, a multiple comparison test will define which of the three or more groups differ significantly.

AB - Statistical methods used to test the null hypothesis are termed tests of significance. Selection of an appropriate test of significance is dependent on the type of data to be analyzed and the number of groups to be compared. Parametric tests of significance are based on the parameters, mean, standard deviation, and variance, and thus are used appropriately when interval or ratio data are analyzed. The t-test and analysis of variance (ANOVA) are examples of parametric tests of significance. Assumptions regarding the data to be analyzed when using the t-test or ANOVA include normality of the populations from which the sample data are drawn, homogeneity of the variances of the populations from which the sample data are drawn, and independence of the data points within a sample group. The t-test is the appropriate test of significance to use if there are only two groups to compare. If there are three or more groups to compare, ANOVA is the appropriate test. ANOVA holds the preset α level constant. While ANOVA will imply a significant difference between the groups compared, a multiple comparison test will define which of the three or more groups differ significantly.

KW - biostatistics

UR - http://www.scopus.com/inward/record.url?scp=0025284563&partnerID=8YFLogxK

U2 - 10.1016/S0196-0644(05)81712-3

DO - 10.1016/S0196-0644(05)81712-3

M3 - Article

C2 - 2389867

AN - SCOPUS:0025284563

SN - 0196-0644

VL - 19

SP - 820

EP - 825

JO - Annals of Emergency Medicine

JF - Annals of Emergency Medicine

IS - 7

ER -