5) In Problem 2, data on numbers of publications were given for an SRS of 50 faculty members. Not all departments were represented, however, in the SRS. The SRS contained several faculty members from psychology and from chemistry, but none from foreign languages. The following data are from a stratified sample of faculty, using the areas biological sciences, physical sciences, social sciences, and humanities as the strata. Stratum Biological Sciences Physical Sciences Social Sciences Humanities Total Number of Refereed Publications 0 1 2 3 4 5 6 7 8 Number of Faculty Members in Stratum 1 2 102 310 217 178 0 1 0 807 The frequency table for number of publications in the strata is given below. Number of Faculty Members Biological Physical Social 10 2 0 Number of Faculty Members in Sample 1 2 1 1 0 9 0 1 0 2 0 1 0 0 7 19 13 11 8 2 0 1 0 0 0 0 0 50 Humanities a) Estimate the total number of refereed publications by faculty members in the college, and give the standard error. Note: For a frequency table, Y₁ = Σjesh fnjynj, and sh = -1 Σjesn fnj (Ynj — Yn) ². nh b) How does your result from (a) compare with the result from the SRS in Problem 2? Hint: Compare (i) s's for the individual strata with s² as a whole, and (ii) standard errors. c) Estimate the proportion of faculty with no refereed publications, and give the standard error. Hint: Information about no refereed publications is given in the first row of the frequency table for number of publications d) Use no more than four sentences to explain why the stratified sampling did or did not increase the precision in this example.
5) In Problem 2, data on numbers of publications were given for an SRS of 50 faculty members. Not all departments were represented, however, in the SRS. The SRS contained several faculty members from psychology and from chemistry, but none from foreign languages. The following data are from a stratified sample of faculty, using the areas biological sciences, physical sciences, social sciences, and humanities as the strata. Stratum Biological Sciences Physical Sciences Social Sciences Humanities Total Number of Refereed Publications 0 1 2 3 4 5 6 7 8 Number of Faculty Members in Stratum 1 2 102 310 217 178 0 1 0 807 The frequency table for number of publications in the strata is given below. Number of Faculty Members Biological Physical Social 10 2 0 Number of Faculty Members in Sample 1 2 1 1 0 9 0 1 0 2 0 1 0 0 7 19 13 11 8 2 0 1 0 0 0 0 0 50 Humanities a) Estimate the total number of refereed publications by faculty members in the college, and give the standard error. Note: For a frequency table, Y₁ = Σjesh fnjynj, and sh = -1 Σjesn fnj (Ynj — Yn) ². nh b) How does your result from (a) compare with the result from the SRS in Problem 2? Hint: Compare (i) s's for the individual strata with s² as a whole, and (ii) standard errors. c) Estimate the proportion of faculty with no refereed publications, and give the standard error. Hint: Information about no refereed publications is given in the first row of the frequency table for number of publications d) Use no more than four sentences to explain why the stratified sampling did or did not increase the precision in this example.
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
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Problem 1P
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