(e) Calculate a point estimate of the population coefficient of variation a/ u. (Round your answer to four decimal places.) 21.0054 State which estimator you used. O O

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
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Author:Carter
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Chapter10: Statistics
Section10.3: Measures Of Spread
Problem 1GP
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I'm not sure why that one incorrect section is incorrect. I'm guessing it might have something to do with my calculations.

Consider the accompanying data on flexural strength (MPa) for concrete beams of a certain type.
9.7
6.3
9.0
7.2
7.8 7.4
7.9
6.8
7.0
5.3
11.8 8.7
8.1
6.8
7.3
11.6
7.7
7.7
6.3 9.7 11.3
7.1
6.5
10.7
7.0 8.1
9.0
(a) Calculate a point estimate of the mean value of strength for the conceptual population of all beams manufactured in this fashion. [Hint: Ex¡ = 219.8.] (Round your answer to three decimal places.)
8.141
MPа
State which estimator you used.
Os/x
(b) Calculate a point estimate of the strength value that separates the weakest 50% of all such beams from the strongest 50%.
7.7
MPa
State which estimator you used.
O s /x
(c) Calculate a point estimate of the population standard deviation o. [Hint: Ex;² = 1865.4.] (Round your answer to three decimal places.)
1.71
MPа
O O
Transcribed Image Text:Consider the accompanying data on flexural strength (MPa) for concrete beams of a certain type. 9.7 6.3 9.0 7.2 7.8 7.4 7.9 6.8 7.0 5.3 11.8 8.7 8.1 6.8 7.3 11.6 7.7 7.7 6.3 9.7 11.3 7.1 6.5 10.7 7.0 8.1 9.0 (a) Calculate a point estimate of the mean value of strength for the conceptual population of all beams manufactured in this fashion. [Hint: Ex¡ = 219.8.] (Round your answer to three decimal places.) 8.141 MPа State which estimator you used. Os/x (b) Calculate a point estimate of the strength value that separates the weakest 50% of all such beams from the strongest 50%. 7.7 MPa State which estimator you used. O s /x (c) Calculate a point estimate of the population standard deviation o. [Hint: Ex;² = 1865.4.] (Round your answer to three decimal places.) 1.71 MPа O O
(c) Calculate a point estimate of the population standard deviation o. [Hint: Ex;² = 1865.4.] (Round your answer to three decimal places.)
1.71
MPa
Interpret this point estimate.
This estimate describes the bias of the data.
This estimate describes the linearity of the data.
This estimate describes the center of the data.
This estimate describes the spread of the data.
Which estimator did you use?
s/ x
(d) Calculate a point estimate of the proportion of all such beams whose flexural strength exceeds 10 MPa. [Hint: Think of an observation as a "success" if it exceeds 10.] (Round your answer to three decimal places.)
.148
(e) Calculate a point estimate of the population coefficient of variation o/µ. (Round your answer to four decimal places.)
21.0054
State which estimator you used.
s/x
Transcribed Image Text:(c) Calculate a point estimate of the population standard deviation o. [Hint: Ex;² = 1865.4.] (Round your answer to three decimal places.) 1.71 MPa Interpret this point estimate. This estimate describes the bias of the data. This estimate describes the linearity of the data. This estimate describes the center of the data. This estimate describes the spread of the data. Which estimator did you use? s/ x (d) Calculate a point estimate of the proportion of all such beams whose flexural strength exceeds 10 MPa. [Hint: Think of an observation as a "success" if it exceeds 10.] (Round your answer to three decimal places.) .148 (e) Calculate a point estimate of the population coefficient of variation o/µ. (Round your answer to four decimal places.) 21.0054 State which estimator you used. s/x
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