. A corporation desires to estimate the total number of man-hours lost, for a given month, because of accidents among all employees. Since laborers, technicians, and administrators have different accident rates, the researcher decides to use stratified random sampling, with each group forming a separate stratum. Data from previous years suggest the variances shown in the accompanying table for the number of man-hours lost per employee in the three groups, and current data give the stratum sizes. Determine the Neyman allocation for a sample of n = 30 employees. %3D II (Laborers) (Technicians) (Administrato:s) 475 o = 36 N = 132 0글3D25 N2 = 92 %3D 7295 %3D N=27

. A corporation desires to estimate the total number of man-hours lost, for a given month, because of accidents among all employees. Since laborers, technicians, and administrators have different accident rates, the researcher decides to use stratified random sampling, with each group forming a separate stratum. Data from previous years suggest the variances shown in the accompanying table for the number of man-hours lost per employee in the three groups, and current data give the stratum sizes. Determine the Neyman allocation for a sample of n = 30 employees. %3D II (Laborers) (Technicians) (Administrato:s) 475 o = 36 N = 132 0글3D25 N2 = 92 %3D 7295 %3D N=27

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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4. Two people are arguing about the size of different breeds of dogs. One believes that German shepherds are larger than huskies, while the other person believes the opposite is true. They conduct a study to see which one of them is correct. They sample the weights of ten dogs of each breed. The data are as follows: German Shepherds: 55, 72, 61, 43, 59, 70, 67, 49, 55, 63 Huskies: 48, 77, 46, 51, 60, 44, 53, 61, 52, 41 (a) Should a one-tailed or two-tailed test be conducted? Why? (b) Conduct the appropriate test with alpha = 0.05. Which breed is larger or are they the same?
1. Birds can regrow feathers if they are lost. A researcher was interested in whether newly regrown feathers in the tails of northern flickers differed in colour (yellowness in particular) compared to older feathers. To test this, they measured the yellowness of one new and one randomly selected old feather on each of 20 birds. A plot of their data and the results of their analysis are shown below. Yellowness 160 150 140 130 new X Feather old Welch Two Sample t-test = data: Yellowness by Feather t = 1.5832, df 37.986, p-value 165 sample estimates: mean in group new mean in group old 147.9623 143.3000 160 New 155 150 145 140 135 = 0.1217 alternative hypothesis: true difference in means is not equal to 0 95 percent confidence interval: -1.299296 10.623962 T T T T T 130 135 140 145 150 155 160 Old a) From the results above, what is the null hypothesis and what statistical conclusion do you make concerning it?
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