BST 322 Quiz 3 Practice 2 Questions and Answers

BST 322 Quiz 3 Practice 2 Questions and Answers Chi square test for independence compares observed frequencies with: - Answer- Expected frequencies The test statistic calculated in the process of a Kruskall-Wallis test is H. - Answer-true This is used when the expected cell frequency in a 2X2 table is less than 5 - Answer- Fisher's exact test If the Chi-Square statistic is less than the table value, we accept the null hypothesis. - Answer-true Chi-square tests can only be conducted for a 2X2 contingency table - Answer-false A researcher wants to determine if blocked heparin lock (yes or no) is related to the occurrence of subsequent complications (yes or no). The Chi-Square null hypothesis for this study is that a blocked heparin lock leads to complications. - Answer-false This test is analogous to the t-test (independent groups), when the measurement of the dependent variable is ordinal. - Answer-Mann-Whitney U-test The degrees of freedom for a 3X4 contingency table are: - Answer-6 This is the measure of strength of relationship most commonly used with a 2X2 table. - Answer-phi Parametric tests can be used with any type of data. - Answer-false The distribution of chi-square values is normally distributed. - Answer-false The formula for is (Rtotal X Ctotal)/N - Answer-Expected frequencies This can be thought of as the chi-square type equivalent to the paired t-test - Answer- McNemar test Expected frequencies are the number of cases that would be found in each cell if the null hypothesis were true. - Answer-true Non-parametric tests are more powerful than parametric tests. - Answer-false Parametric tests can be used with any type of data as the dependent variable (i.e., nominal, ordinal, interval, etc.). - Answer-false