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
PPH4801/MPHDHM9 Jan/Feb 2018 16 A study of 100 pabents is perfomed to determine f cholesterol levels...
PPH4801/MPHDHM9 Jan/Feb 2018 12 A random sample of 300 diastolic blood pressure measure blood pressure is 99% confidence mmH g lf a 95% confidence interval is also calculated, then interval for the population mean diastolic blood pressure iS 68 to rs The 95% confidence interval will be wider than the 99% The 95% confidence interval will be narrower than the 99% 95% and 99% confidence interval will be the same 4 One cannot make general statement about whether the 95%...
PPH4801/MPHDHM9 JAN/FEB 2017 SECTION B. You MUST answer a TOTAL of THREE (3) questons QUESTION 1 An investigator wants to assess whether smoking is a nsk factor for pancreatic cancer Electronic medical records at a local hospital will be used to identfy 50 patents with pancreatic cancer One hundred patients who are similar but free from pancreatic cancer will also be selected Each particapant's health record will be analysed for smoking history 11 Name the type of study proposed 12...
PPH4801/MPHDHM9 Jan/Feb 2018 To evaluate the effectiveness of 2 different smoking cessation programs, smokers are e either program A or program B Of 6 smokers on program A, 1 statistical procedure would you use to test null hypothesis that the programs 20 randomızed to recerv stopped not Which are equally effective and to obtain a p-value? o soking and 5 did not Of 6 smokers on program B, 4 stopped smoking and 2 did 1 Pared t-test 2 Fischer's exact...
i) State the Hypotheses to Test. ii) Make a decision based on the information given. iii) What would be Type I and Type II errors. 3. A study is conducted to compare mean cholesterol levels for individuals following a low carbohydrate diet for at least 6 months to individuals following a conventional (low-fat, low calorie) diet for at least 6 months. The data are summarized below: Diet Program Low Carbohydrate Conventional Sample Size Mean Cholesterol Std Dev Cholesterol 50 225.4...
3. A health researcher in a hospital believes that the mean cholesterol level for certain male population aged-50 is 241. An investigator wishes to examine whether the cholesterol levels are significantly reduced by modifying diet. A random sample of 12 patients agrees to participate in the study and follow the modified diet for 3 months. After 3 months, their cholesterol levels are measured. The mean cholesterol level in the sample is 235 with a standard deviation of 12.5. Based on...
A new drug to treat high cholesterol is being tested by pharmaceutical company. The cholesterol levels for 21 patients were recorded before administering the drug and after. The 90% confidence interval for the true mean difference in total cholesterol levels (after - before) was (14.93, 45.35). Which of the following is the appropriate conclusion? 1) We are 90% confident that the average difference in cholesterol levels is positive, with the higher cholesterol levels being after the drug regimen. 2) We...
Small Sample Mean Problem. A study was done to determine the effect of vitamin supplements for the mother on the birth weight of babies. The sample size was 17. All the women in the study regularly visited a doctor during their pregnancy. The data below show the summary statistics and a stem and leaf plot of the birth weight of the 17 babies. Weight is in kilograms (kg). Stem Leaf 2 47 2* 54 3 02 22 39 43 3*...
Small Sample Mean Problem. A study was done to determine the effect of vitamin supplements for the mother on the birth weight of babies. The sample size was 17. All the women in the study regularly visited a doctor during their pregnancy. The data below show the summary statistics and a stem and leaf plot of the birth weight of the 17 babies. Weight is in kilograms (kg). Stem Leaf 2 47 2* 54 3 02 22 39 43 3*152...
Small Sample Mean Problem. A study was done to determine the effect of vitamin supplements for the mother on the birth weight of babies. The sample size was 17. All the women in the study regularly visited a doctor during their pregnancy. The data below show the summary statistics and a stem and leaf plot of the birth weight of the 17 babies. Weight is in kilograms (kg) Leaf Stem Mean 3.761 2 47 2* 54 3 02 22 39...
1. An investigator hypothesizes that cholesterol levels in children might be affected by educating their parents on proper nutrition and exercise. A sample of 40 families with a child between the ages of 10-15 who has been diagnosed with high cholesterol agree to participate in the study. All parents are provided educational information on nutrition and exercise. After following the prescribed program, their child's total cholesterol level is measured. The children's mean cholesterol level is 175 with a standard deviation...