# The range for a set of data is estimated to be 56.a. What is the planning value for the population standard deviation?14b. At 95% confidence, how large a sample would provide a margin of error of 3? Round up to the next whole numberc. At 95% confidence, how large a sample would provide a margin of error of 2? Round up to the next whole number.

Question help_outlineImage TranscriptioncloseThe range for a set of data is estimated to be 56. a. What is the planning value for the population standard deviation? 14 b. At 95% confidence, how large a sample would provide a margin of error of 3? Round up to the next whole number c. At 95% confidence, how large a sample would provide a margin of error of 2? Round up to the next whole number. fullscreen
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Step 1

a. The planning value for the standard deviation is calculated as:

Step 2

b. The required sample size (n) for estimating populati... help_outlineImage Transcriptionclosen= = x- 물 E Here, E is the margin of error and o is the population standard deviation At 95% confidence level, the critical value is: - 1.96 Thus n= E 14 1.96x 3 83.67 84 The required n is 84 fullscreen

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