1-Compute the value of the test statistics.2-Determine the rejection region for this test To protect against earthquake damage, steel beams are typically fitted and connected with plastic hinges. However,these plastic hinges are prone to deformations and are difficult to inspect and repair. An alternative method ofconnecting steel beams-one that uses high-strength steel bars with clamps-was investigated. Mathematical modelsfor predicting the performance of these steel connecting bars assume the bars have a mean yield strength of 300megapascals (MPa). To verify this assumption, the researchers conducted material property tests on the steelconnecting bars. In a sample of three tests, the yield strengths were 357, 372, and 366 MPa. Do the data indicate thatthe true mean yield strength of the steel bars exceeds 300 MPa? Test using α = 0.05.

The question is about hypo. testing Given : Popl. mean yield strength of the steel bars ( μ ) = 300…

Answered: To protect against earthquake damage,…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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9. In case of two samples test: If z value is in the rejection region, the decision is: "reject the alternative hypothesis" Select one: True False
A study is designed to determine the effect of an office-training course on typing productivity. Fifteen typists who have not taken the course are randomly selected. The investigator assigns 20 pages of equally difficult text to be typed by each typist both before and after completing the training course. The investigator wants to find out whether the training course has reduced the number of errors by more than 10. Define d = Before − After. Significance level What conclusion should we reach if the p-value is 0.113?
Typically, only very brave students are willing to speak out in a college classroom. Student participation may be especially difficult if the individual is from a different culture or country. The article “An Assessment of Class Participation by International Graduate Students” (Journal of College Student Development) considered a numerical “speaking-up” scale, with possible values from 3 to 15 (a low value means that a student rarely speaks). For a random sample of 64 males from Asian countries where English is not the official language, the sample mean and standard deviation were 8.75 and 2.57, respectively. Suppose that the mean for the population of all males having English as their native language is 10 (suggested by data in the article). We want to find whether the population mean for males from non-English speaking Asian countries is smaller than 10. A) State the sign of the alternative hypothesis. _________________(type one of these 3 choices: greater than, less than, or not…
You intend to conduct a test of homogeneity for a contingency table with 8 categories in the column variable and 6 categories in the row variable. You collect data from 373 subjects. What are the degrees of freedom for the x distribution for this test? d.f. = Submit Question Ghp
lume Assume that a simple random sample has been selected from a normally distributed population and test the given claim. Identify the null and alternative hypotheses, test statistic, P-value, and state the final conclusion that addresses the original claim. A safety administration conducted crash tests of child booster seats for cars. Listed below are results from those tests, with the measurements given in hic (standard head injury condition units). The safety requirement is that the hic measurement should be less than 1000 hic. Use a 0.05 significance level to test the claim that the sample is from a population with a mean less than 1000 hic, Do the results suggest that all of the child booster seats meet the specified requirement? 712 660 1192 616 588 534 O What are the hypotheses?
A sample sequence of 42 products is selected (in order) from an assembly line. Each product is examined and judged to be either acceptable or defective. A total of 35 of these products were found to be acceptable, and the other 7 were found to be defective. The number of runs was 5. The runs test is to be used at the 0.05 significance level to test for randomness. Find the value of the test statistic used in this test, and round it to 3 places after the decimal point (if necessary) Test statistic: Submit Question DII F3 4 R F4 % 5 T G A F5 A 6 Y H F6 & 7 U F7 PrtScn 8 F8 K Home 9 F9 O End F10 P
Perform a hypothesis test to determine whether there is a difference in the mean attendance of teams between the two groups created in Part F. Use a 0.05 level of significance in your testing procedures. Hint: When calculating your pooled sample variance and your test statistic, assume the Top 10 data is sample 1 and the Bottom 10 data is sample 2. Decision Rule -t < or t > = REJECT H0 Value of Pooled Sample Variances Value of test statistic Decision: enter Reject or Do Not Reject Is there a difference in the mean attendance between the two groups assuming a 0.05 level of significance? Enter Yes or No. Another variable that can impact attendance is the team's win-loss record. Teams that are winning more games are thought to have increased attendance as fans prefer to see their home team "win" rather than "lose" (although for some teams such as the Chicago Cubs, this is not always an established relationship!). Create 2 samples…
A researcher wants to use the most powerful test Choose one One way anova or two way chi or Mann Whitney
Determine the appropriate test to use from the four choices in photo then test the hypothesis under 5% significance level.

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