4) Name the sampling method used in this scenario: poople are divided into group

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4) Name the sampling method used in this scenario: poople are divided into groups by hair color.then 12 are chosen from each group S) TRUEe FALSE Atleast 95% or all the scores are with in 2 standard deviations of the mean. Any time the les slalistic is close to I-You may acept the claim as true. It is possible to peove that the means of two populations are equal The mean of all sample standard deviations is eqeal to the overall standard deviation The mean of all sample means is equal tothe overall mean. To score at the 98h percentile means that the person got 98% of queskes right Using statistics i is possible to prove that smoking causes cancer Normal distributions are made from histoprams Two samples are indepenent if the chi-ed test statistic is below 10. b) Listed below are the apes of Hartnell Collepe students 19,21, 26,25,20, 18, 17,45, 23, 26,21,20, 19,25,24, 26, 51, 39, 17 a) Find the ape at the 33" percentile. b) Find the mean and the median )Create a frequency table with 3 classes d) Assuming there is a noemal distribution for these ages, find the probabilty that a student is at least 21 years old.

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4)

Stratified Sampling is possible when it makes sense to partition the population into groups based on a factor that may influence the variable that is being measured.   These groups are then called strata. An individual group is called a stratum. With stratified sampling one should:

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