Stratified sampling 1. Can be more representative than simple randomized sampling II. Can be used if the population has a number of distinct groups III. Is done by randomly sampling from subgroups in a way that is proportional to their size in the population Select the correct response: I, II, III II and III I and III I and II

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A: The answer is attached below,

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A:

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Q: ce level.

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A: The option is D.

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A: The mean is calculated as follows: μ=∑xN  =194+219+93+299+1915  =199.2 The mean is 199.2.

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Q: 16 25 38 46 50 65 109 123 143 131 201 184

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Q: the average grade is 84 with a standard deviation of 4. What is each grade for -1 2 0 1.5 -1.25

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