A study was undertaken to examine the tensile strength of a new type of polyester fibre. Where random sample of n = 30 observations. The existing type of polyester fibre that the new type is designed to replace has a mean breaking strength of 0.26 grams/denier. The study wants to test whether the mean breaking strength of the new type of polyester fibre differs from the mean breaking strength of the existing type of polyester fibre. (i) Write down appropriate null and alternative hypotheses for a test of whether the mean breaking strength of the new type of polyester fibre differs from the mean breaking strength of the existing type of polyester fibre. Define any notation that you use. (iii) Write down the formula for the test statistic used in the z-test | Define any further notation that you use. (iv) Write down the null distribution of the test statistic in part (a)(iii). What is the reason for the use of the word 'null' in the phrase 'null distribution'?
A study was undertaken to examine the tensile strength of a new type of polyester fibre. Where random sample of n = 30 observations. The existing type of polyester fibre that the new type is designed to replace has a mean breaking strength of 0.26 grams/denier. The study wants to test whether the mean breaking strength of the new type of polyester fibre differs from the mean breaking strength of the existing type of polyester fibre. (i) Write down appropriate null and alternative hypotheses for a test of whether the mean breaking strength of the new type of polyester fibre differs from the mean breaking strength of the existing type of polyester fibre. Define any notation that you use. (iii) Write down the formula for the test statistic used in the z-test | Define any further notation that you use. (iv) Write down the null distribution of the test statistic in part (a)(iii). What is the reason for the use of the word 'null' in the phrase 'null distribution'?
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.3: Measures Of Spread
Problem 1GP
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Transcribed Image Text:A study was undertaken to examine the tensile strength of a new type of polyester fibre. Where
random sample of n = 30 observations.
The existing type of polyester fibre that the new type is designed to replace has a mean breaking
strength of 0.26 grams/denier. The study wants to test whether the mean breaking strength of the
new type of polyester fibre differs from the mean breaking strength of the existing type of polyester
fibre.
(i) Write down appropriate null and alternative hypotheses for a test
of whether the mean breaking strength of the new type of polyester
fibre differs from the mean breaking strength of the existing type of
polyester fibre. Define any notation that you use.
(iii) Write down the formula for the test statistic used in the z-test
| Define any further notation that you use.
(iv) Write down the null distribution of the test statistic in part (a)(iii).
What is the reason for the use of the word 'null' in the phrase 'null
distribution'?
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