ch14estimationofmean,varianceandproportion

# B solution xi xi x1 s1 x 494667 s 25458 x1 50

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Unformatted text preview: =s Thus for the above data. ˆ σ = 189.8171 = 13.7774 In the 50FH calculator, there is a key for (x − x) ˆ σ =s= ∑ 2 i n −1 xσn − 1 This is named “ ”. It makes the calculation very convenient. Data Set 1 Data Set 2 N2 = 5 Recall from Chapter 6: µ1 = 15 µ 2 = 24 σ2 = 3 σ1 = 4 Combine data sets A and B and calculate and Solution: xi xi fi fi µ1 − σ 1 µ1 + σ 1 µ2 −σ 2 µ2 + σ 2 11 2 N1 2 19 2 N1 2 21 2.5 N2 2 27 2.5 N2 2 Example 3: Amy and Ben separately took a sample from the same population. Each submitted their own result: Data set A Data Set B n1 = 7 x1 = 50 s1 = 2 n2 = 8 x2 = 49 s2 = 3 Now mix the two sets of data to estimate (a) the population mean, μ (b) the population standard deviation, σ. (b) Solution: xi xi x1 − s1 ˆ µ = x = 49.4667 ˆ σ = s = 2.5458 x1 50 1 x...
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## This note was uploaded on 02/22/2010 for the course FBE STAT0302 taught by Professor Unknown during the Spring '10 term at HKU.

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