A standardized test has been conducted to compute the compressive strength of two brands of cements. Fourteen cubes of cement 1 were tested by crushing them under a hydraulic press. Fifteen cubes of cement 2 were tested under similar condition. The cubes of cement 1 gave an average compressive strength of 59,4 MPa with a sample standard deviation of 7.8 MPa, while the cubes of cement 2 gave an average of 55.8 MPa with a sample standard deviation of 8.2 MPa. Can we conclude at the 0.05 level of significance that the compressive strength of cement 1 exceeds that of cement 2 by more than 2 MPa? Assume the populations to be approximately normal with equal variances. What is the statistic/type of hypothesis testing to be used in this problem? * O Two Sample Z Test O Two Sample Pooled Variance t Test O Two Sample Separate Variance t Test O Paired t Test 39 What is the null and alternative hypothesis * The difference between the compressive strength of cement 1 and cement 2 is EQUAL to 2 (Ho: 01 - 82 = 2); The compressive strenght of cement 1 EXCEEDS the compressive strength of cement 2 (Ho: 01 - 02 > 2) The difference between the compressive strength of cement 1 and cement 2 is EQUAL to 2 (Ho: 01 - 02 = 2); The compressive strenght of cement 1 IS LESS THAN the compressive strength of cement 2 (Ho: 01 - 02 < 2) The difference between the compressive strength of cement 1 and cement 2 is EQUAL to 2 (Ho: 01 - 02 = 2); ) The compressive strenght of cement 1 NOT EQUAL TO the compressive strength of cement 2 (Ho: 01 - 82 2) 40 What are the significance level and the type of test? * Da = 0.05, Right-tailed Oa- 0.05, left-tailed )a= 0.05, two-tailed
A standardized test has been conducted to compute the compressive strength of two brands of cements. Fourteen cubes of cement 1 were tested by crushing them under a hydraulic press. Fifteen cubes of cement 2 were tested under similar condition. The cubes of cement 1 gave an average compressive strength of 59,4 MPa with a sample standard deviation of 7.8 MPa, while the cubes of cement 2 gave an average of 55.8 MPa with a sample standard deviation of 8.2 MPa. Can we conclude at the 0.05 level of significance that the compressive strength of cement 1 exceeds that of cement 2 by more than 2 MPa? Assume the populations to be approximately normal with equal variances. What is the statistic/type of hypothesis testing to be used in this problem? * O Two Sample Z Test O Two Sample Pooled Variance t Test O Two Sample Separate Variance t Test O Paired t Test 39 What is the null and alternative hypothesis * The difference between the compressive strength of cement 1 and cement 2 is EQUAL to 2 (Ho: 01 - 82 = 2); The compressive strenght of cement 1 EXCEEDS the compressive strength of cement 2 (Ho: 01 - 02 > 2) The difference between the compressive strength of cement 1 and cement 2 is EQUAL to 2 (Ho: 01 - 02 = 2); The compressive strenght of cement 1 IS LESS THAN the compressive strength of cement 2 (Ho: 01 - 02 < 2) The difference between the compressive strength of cement 1 and cement 2 is EQUAL to 2 (Ho: 01 - 02 = 2); ) The compressive strenght of cement 1 NOT EQUAL TO the compressive strength of cement 2 (Ho: 01 - 82 2) 40 What are the significance level and the type of test? * Da = 0.05, Right-tailed Oa- 0.05, left-tailed )a= 0.05, two-tailed
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
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Chapter1: Starting With Matlab
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Transcribed Image Text:A standardized test has been conducted to compute the compressive strength of two brands of cements.
Fourteen cubes of cement 1 were tested by crushing them under a hydraulic press. Fifteen cubes of cement
2 were tested under similar condition. The cubes of cement 1 gave an average compressive strength of 59.4
MPa with a sample standard deviation of 7.8 MPa, while the cubes of cement 2 gave an average of 55.8
MPa with a sample standard deviation of 8.2 MPa. Can we conclude at the 0.05 level of significance that the
compressive strength of cement 1 exceeds that of cement 2 by more than 2 MPa? Assume the populations
to be approximately normal with equal variances.
38
What is the statistic/type of hypothesis testing to be used in this problem? *
O Two Sample Z Test
O Two Sample Pooled Variance t Test
Two Sample Separate Variance t Test
O Paired t Test
39
What is the null and alternative hypothesis *
The difference between the compressive strength of cement 1 and cement 2 is EQUAL to 2 (Ho: 61 - 62 = 2);
The compressive strenght of cement 1 EXCEEDS the compressive strength of cement 2 (Ho: 61 - 62 > 2)
The difference between the compressive strength of cement 1 and cement 2 is EQUAL to 2 (Ho: 61 - 62 = 2);
The compressive strenght of cement 1 IS LESS THAN the compressive strength of cement 2 (Ho: 01 - 62 < 2)
The difference between the compressive strength of cement 1 and cement 2 is EQUAL to 2 (Ho: 61 - 62 = 2);
O The compressive strenght of cement 1 NOT EQUAL TO the compressive strength of cement 2 (Ho: 81 - 62 +
2)
40
What are the significance level and the type of test? *
O a = 0.05, Right-tailed
O a = 0.05, left-tailed
O a = 0.05, two-tailed
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