Question

PPH4801/MPHDHM9 Jan/Feb 2018 16 A study of 100 pabents is perfomed to determine f cholesterol levels are lowered after 3 months of taking a new drug Cholesterol levels are measured on each individual at the beginning of the study and 3 months later The cholesterol change is calculated the value at 3 months minus the value at the beginning of the study On average the cholesterol levels among these 100 patents decreased by 150 and the standard deviation of the changes in cholesterol was 40 What can be said about the 2 sided p- value for testing the null hypothesus of no change in cholesterol levels? which is 1 The p value is less than 0 05 2 The p value is greater than 0 05 3 The p value is equai to 0 05 4 Cannot be determined from the unformation given 17 The standard error of a statıstic is 1 The mean of the sampling distnbution 2 The standard deviation of the sampling distribution 3 The statıstic divided by the square root of the sample sıze (that is, statstcNN) 4 The standard error of the median 18 Two hundred hypertensive patents are randomized to erther a diet program or an exercise program (102 patents to diet program, 98 patents to exercise program) Blood pressure is measured on each patent both before the programs start and 3 months after the start of each program The correct statıstical procedure to determine whether or not the mean blood pressure change (after-before) was statistically significantly different for the two programs is 1 Paired t-test 2 sample unpaired t-test 3 Fischer's exact test 4 None of the above a Measurements on a (random) sample of babies born to mothers who took "Presanpbon Drua A during pregnancy were compared to measurements on a (random) sample of babies born to mothers who did not take "Prescnpton Drug A A statistically significant of mothers (p 0 03) Based only on this information you can conclude There is a 3% chance the null hypothesis is true rece in the mean head circumference was found between children born to the two 2 Taking "Prescription Drug A" during pregnancy causes a reduction in child's head None of the above The sample mean difference in children's head circumference between children born to the two groups of mother' is clinically important/signfíicant

Answer 1

17.The standard error of statistics is

ans:Standard error is a statistical term which measures the acurracy of a sample which represents the population.the sample mean deviates the actual mean of the population which gives the standard error.

Thus option 1 is the right answer -the mean of the sampling distribution