Diabetes Plasma-glucose levels are used to determine the presence of diabetes. S
ID: 3000945 • Letter: D
Question
DiabetesPlasma-glucose levels are used to determine the presence of diabetes. Suppose the mean in (plasma-glucose) concentration (mg/dL) in 35- to 44-year-olds is 4.86 with standard deviation = 0.54. A study of 100 sedentary people in this age group is planned to test whether they have a higher or lower level of plasma glucose than the general population.
7.9 How many people would need to be studied to have 80% power under the assumptions in Problem 7.7?
Problem 7.7 If the expected difference is 0.10 in units, then what is the power of such a study if a two-sided test is to be used with a = .05?
Explanation / Answer
Non-Sampling Errors Reasons Non-sampling errors generally arise due to the following reasons:- (i) Improper or ambiguous definition of the various terms. If the different terms used in a survey are not properly defined and cannot be easily identified, mistakes would creep in and the element of non-sampling errors would go up. (ii) Incomplete questionnaire and defective methods of interviewing. These may also give rise to non-sampling errors. (iii) Personal bias of the investigator is also responsible for non-sampling errors as the data collected in such a situation would not be representative. (iv) Lack of trained and qualified investigators and failure of respondents to give correct answers also leads to such errors. (v) Improper coverage and inadequate or incomplete response also result in non-sampling errors. (vi) Errors in compilation and tabulation. Very often mistakes are committed in the tabulation and classification of data which result in non-sampling errors. Such errors may also arise on account of defective printing of the tabulated results. Online Homework Assignment Experience in Non-Sampling Errors Reasons Transtutors provide 24x7 Homework Help, Regular One to One Grade Tutoring in non-sampling errors reasons. Our unique approach with a highly qualified and certified statistics tutors team of 100 plus tutors gives an edge. You can submit your school, college or university level statistics homework or assignment to us and we will make sure that you get the answers you need which are timely and also cost effective.