Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN: 9780079039897
Author: Carter
Publisher: McGraw Hill
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Consider the accompanying data on flexural strength (MPa) for concrete beams of a certain type.
| 8.3 | 7.4 | 7.0 | 6.8 | 7.8 | 9.7 | 5.0 |
| 6.3 | 6.8 | 9.0 | 7.7 | 7.3 | 7.4 | 11.8 |
| 6.3 | 7.7 | 11.6 | 7.2 | 11.3 | 9.7 | 10.7 |
| 7.0 | 7.9 | 8.7 | 7.9 | 8.1 | 6.5 |
(a) Calculate a point estimate of the mean value of strength for the conceptual population of all beams manufactured in this fashion. [Hint: Σxi = 218.9.] (Round your answer to three decimal places.)
MPa
(b) Calculate a point estimate of the strength value that separates the weakest 50% of all such beams from the strongest 50%.
MPa
(c) Calculate a point estimate of the population standard deviation ?. [Hint: Σxi2 = 1851.35.] (Round your answer to three decimal places.)
MPa
(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.)
(e) Calculate a point estimate of the population coefficient of variation ?/?. (Round your answer to four decimal places.)
MPa
(b) Calculate a point estimate of the strength value that separates the weakest 50% of all such beams from the strongest 50%.
MPa
(c) Calculate a point estimate of the population standard deviation ?. [Hint: Σxi2 = 1851.35.] (Round your answer to three decimal places.)
MPa
(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.)
(e) Calculate a point estimate of the population coefficient of variation ?/?. (Round your answer to four decimal places.)
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