(a) Find the sample mean. The sample mean is O (Round to two decimal places as needed.) (b) Find the sample standard deviation. The sample standard deviation is. (Round to two decimal places as needed.) (c) Construct a 90% confidence interval for the population mean u. The 90% confidence interval for the population mean u is (Round to two decimal places as needed.)

Big Ideas Math A Bridge To Success Algebra 1: Student Edition 2015
1st Edition
ISBN:9781680331141
Author:HOUGHTON MIFFLIN HARCOURT
Publisher:HOUGHTON MIFFLIN HARCOURT
Chapter11: Data Analysis And Displays
Section: Chapter Questions
Problem 10CT
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The following data represent the concentration of dissolved organic carbon (mg/L) collected from 20 samples of organic soil.
Assume that the population is normally distributed. Complete parts (a) through (c) on the right.
29.80
15.42
15.42
27.10
16.51
20.46
8.81
20.46
14.90
33.67
30.91
14.86
5.20
15.35
9.72
19.80
14.86
8.09
16.87
18.30
(a) Find the sample mean.
The sample mean is
(Round to two decimal places as needed.)
(b) Find the sample standard deviation.
The sample standard deviation is
(Round to two decimal places as needed.)
(c) Construct a 90% confidence interval for the population mean u.
The 90% confidence interval for the population mean u is ( | ).
(Round to two decimal places as needed.)
Transcribed Image Text:The following data represent the concentration of dissolved organic carbon (mg/L) collected from 20 samples of organic soil. Assume that the population is normally distributed. Complete parts (a) through (c) on the right. 29.80 15.42 15.42 27.10 16.51 20.46 8.81 20.46 14.90 33.67 30.91 14.86 5.20 15.35 9.72 19.80 14.86 8.09 16.87 18.30 (a) Find the sample mean. The sample mean is (Round to two decimal places as needed.) (b) Find the sample standard deviation. The sample standard deviation is (Round to two decimal places as needed.) (c) Construct a 90% confidence interval for the population mean u. The 90% confidence interval for the population mean u is ( | ). (Round to two decimal places as needed.)
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