The preparations were randomly drawn from the same population. a. Find the mean and standard deviation for each sample. b. Obtain the pooled value s Spooled c. Why is s Spooled a better estimate of o than the standard deviation from any one sample?

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9)
9. Analysis of several plant-food preparations for potassium ion
yielded the following data:
Sample
1
2
3
4
5
Percent K+
6.02, 6.04, 5.88, 6.06, 5.82
7.48, 7.47, 7.29
3.90, 3.96, 4.16, 3.96
4.48, 4.65, 4.68, 4.42
5.29, 5.13, 5.14, 5.28, 5.20
The preparations were randomly drawn from the same
population.
a. Find the mean and standard deviation for each sample.
b. Obtain the pooled value s
Spooled
c. Why is Spooled a better estimate of o than the standard
deviation from any one sample?
Transcribed Image Text:9. Analysis of several plant-food preparations for potassium ion yielded the following data: Sample 1 2 3 4 5 Percent K+ 6.02, 6.04, 5.88, 6.06, 5.82 7.48, 7.47, 7.29 3.90, 3.96, 4.16, 3.96 4.48, 4.65, 4.68, 4.42 5.29, 5.13, 5.14, 5.28, 5.20 The preparations were randomly drawn from the same population. a. Find the mean and standard deviation for each sample. b. Obtain the pooled value s Spooled c. Why is Spooled a better estimate of o than the standard deviation from any one sample?
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