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Question set 1 Answers 1.2

Question set 1 Answers 1.2 - ’A(3 You have now collected...

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Unformatted text preview: ’A\ (3.) You have now collected 8 male and 10 female mice from the forest and have brought them back to the lab for testing. You wish to take a random sample of size n = 4 from these 18 mice. (5 points) How many different samples of 4 mice are possible? (note, the order in i which the individual mice are selected does not matter) l8! _18><17><16><15 4lxl4! 4x3><2xl : 3060 18C4 : (5 points) What is the probability you select 3 female mice and 1 male mouse (again, order does not matter) in your sample of 4 mice? 10! xi le9x8X8 .oCsngE : 3I><7l 1w: : 3x2><l : 960 :0‘3137 1804 3060 3060 3060 . (4.) You have randomly sampled 50 natural resource professionals to estimate the average number of years they were in college (regardless of the number of degrees earned). The average (or mean) of your sample was 5.80 years and the standard deviation was 1.70 years. (4 points) Calculate the Standard Error of the Mean for these data. SE equals standard deviation divided by the square root of sample size SE = fl : 0.24 years J36 (4 points) Interpret the standard error of the mean calculated in the context of this problem. If I sampled a 5 I 3’ person, I would expecl the mean number of years in college calculated from the 5] observations to be within 0.24 years on either side of 5. 80 years. ...
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