Chap 19
... • Except in the case of small samples, the condition that the data are SRSs from the populations of interest is more important than the condition that the population distributions are Normal. • Sum of the sample sizes less than 15: Use t procedures if the data appear close to Normal. If the data are ...
... • Except in the case of small samples, the condition that the data are SRSs from the populations of interest is more important than the condition that the population distributions are Normal. • Sum of the sample sizes less than 15: Use t procedures if the data appear close to Normal. If the data are ...
Statistics: 1.1 Paired t-tests
... where t∗ is the 2.5% point of the t-distribution on n − 1 degrees of freedom. Using our example: We have a mean difference of 2.05. The 2.5% point of the t-distribution with 19 degrees of freedom is 2.093. The 95% confidence interval for the true mean difference is therefore: ...
... where t∗ is the 2.5% point of the t-distribution on n − 1 degrees of freedom. Using our example: We have a mean difference of 2.05. The 2.5% point of the t-distribution with 19 degrees of freedom is 2.093. The 95% confidence interval for the true mean difference is therefore: ...
SAMPLE STANDARD DEVIATION • The sample standard deviation
... • The sample standard deviation s is approximately the average distance of observations from their mean. With this in mind, list the following sets of numbers in order from smallest standard deviation to largest standard deviation. (a) {1024, 1026, 1025} (b) {1024, 1026} (c) {78, 78, 78} (d) {1, 10, ...
... • The sample standard deviation s is approximately the average distance of observations from their mean. With this in mind, list the following sets of numbers in order from smallest standard deviation to largest standard deviation. (a) {1024, 1026, 1025} (b) {1024, 1026} (c) {78, 78, 78} (d) {1, 10, ...
Course 4 - medinfo.umft.ro
... we found the mean blood systolic pressure of 150 mm Hg with a standard deviation of 12mm. – a) In which interval are there located 68% of patient systolic pressure values ? – b) In which interval can we find the mean systolic pressure with 95% probability ? – c) What percent of pacients have values ...
... we found the mean blood systolic pressure of 150 mm Hg with a standard deviation of 12mm. – a) In which interval are there located 68% of patient systolic pressure values ? – b) In which interval can we find the mean systolic pressure with 95% probability ? – c) What percent of pacients have values ...
