A stratified simple random sample (STSI) is being planned. Information is available from a pilot study...
stratified random sampling question :
+ s2019/ 3. To estimate the total of the number of socio-democratic seats (SDS), y in a municipal council, the population was stratified into four strata using the total number seats in the municipal council. Some information about these strata is given in the following table. Population Sample Number of N. ΣνΗ seats 31-40 756 44 1,647 13,784 72.223 89 441 41-50 168 3.383 9,735 51 -70 56 1,545 617 44,529 24,137 250 8.294 71-...
(1 point) For each problem, select the best response. (a) A simple random sample of size n is defined to be A. a sample of size n chosen in such a way that every unit in the population has the same chance of being selected. B. a sample of size n chosen in such a way that every set of n units in the population has an equal chance to be the sample actually selected. C. a sample of size...
1 point) For each problem, select the best response. (a) A simple random sample of size n is defined to be A. a sample of size n chosen in such a way that every unit in the population has a known nonzero chance of being selected. B. a sample of size n chosen in such a way that every unit in the population has the same chance of being selected. C. a sample of size n chosen in such a...
A sample of 692 families was selected from a large region to
determine, among other things, the proportion of families with
vegetable gardens. The families were classified into three strata -
urban, rural non farm and farm - because these groups were expected
to show differences in the frequency and size of vegetable gardens.
The sampling fraction was roughly the same in all strata, a sample
of 1 per 1000 being aimed at. The values of the population weights
(Wi),...
Question 1. Consider a stratified design composed of H strata of size Nh, h = 1,...,H. We want to estimate the population mean µy of the characteristic y. Let µx,h, h =1,...,H be the means in the strata (in the population) of an auxiliary characteristic x. The µx,h are supposedly known and we propose to estimate µy using the following estimator: b µD = yst +µx −xst where yst and xst are the basic estimate of the population means µy...
A simple random sample of size n is drawn from a population that is known to be normally distributed. The sample variance, s?, is determined to be 13.2. Complete parts (a) through (c). (a) Construct a 90% confidence interval for o2 if the sample size, n, is 20. The lower bound is (Round to two decimal places as needed.)
A simple random sample of size n is drawn from a population that is known to be normally distributed. The sample variance, s?, is determined to be 13.2. Complete parts (a) through (c). (a) Construct a 90% confidence interval for o2 if the sample size, n, is 20. The lower bound is - (Round to two decimal places as needed.)
5. A simple random sample of size n is drawn from a population that is known to be normally distributed. The sample variance, s, is determined to be 9.1. Construct and interpret a 90% confidence interval for o if the sample size, n, is 14. Show formula and final answer to two decimal places. O (6.94, 13.52) O (2.30, 3.68) O (48.15, 182.71) O (5.29.20.08)
A simple random sample of size n is drawn from a population that is known to be normally distributed. The sample variance, s', is determined to be 13.2. Complete parts (a) through (c). (a) Construct a 90% confidence interval for o2 if the sample size, n, is 20. The lower bound is 8.32 . (Round to two decimal places as needed.) The upper bound is 24.79. (Round to two decimal places as needed.) (b) Construct a 90% confidence interval for...
A survey was undertaken to estimate the hours worked per week by volunteers in a social service agency. The agency provides telephone support 7 days a week for 12 hours each day. There are currently 12,478 volunteers across the country. This number is the number recorded in the volunteer register on 1 May 2018. 100 of these volunteers were randomly chosen. The 100 were each sent an email and asked to record the total hours they worked for the week...