Determine the following ;ConclusionHYPOTHESIS Calculation ACTIVITY No. 5SIMPLE COMPARATIVE EXPERIMENTS: T-TEST FOR INDEPENDENT SAMPLES1. The tension bond strength of Portland cement mortar is an important characteristic of the product.An engineer is interested in comparing the strength of a modified formulation in which polymerlatex emulsions have been added during mixing to the strength of the unmodified mortar. Theexperimenter has collected 9 observations on strength for the modified formulation and another 9observations for the unmodified formulation. The data of tension bond strength (in lb/in²) for thedifferent Portland cement formulations are shown below.Modified Mortar Unmodified Mortar10596119991009497899696101939488951059888An engineer preparing different formulations of Portlandcement mortar for tension bond strength measurement.Is there significant difference between the mean tension bond strengths of the two formulations ofPortland cement mortar? Use a = 0.05 and do not assume equal variances.http://www.dectrical-res.com

The t test are used to compare the mean significance between the two sample. It is used when the…

Answered: Determine the following ; Conclusion…

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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Apply the steps in hypothesis testing for each problem. 1. Two rival manufacturers of penlight batteries claimed that their product lasts longer than the other. Thirty samples of Brand A and thirty-four of Brand B were tested. The following are the lengths of lives of such batteries recorded in hours. Use a = 0.05. Brand A 38 41 42 36 39 41 43 35 36 38 42 39 40 43 44 35 40 39 37 40 42 44 38 37 41 40 38 42 45 41 Brand B 38 40 41 43 39 41 40 43 39 38 40 43 44 39 40 41 42 39 40 45 40 38 42 41 40 36 37 41 42 40 36 38 41 40 2. A teacher wants to find out if there is a significant difference in the academic performance of two groups of students. One group meets thrice a week while the other meets twice a week. Below are the final exam scores of the two groups. Use a = 0.01. Зx/wk 80 85 74 75 65 66 80 77 75 95 66 55 79 85 2x/wk 66 98 87 84 85 56 59 25 53 45 66 52
State the null and alternate hypotheses OM 16.4 R ₁-16.4 OM: 16.4 ; M₁: -16.4 OMR-16.4; H₁ > 16.4R 0.250 O 0.100 < P-value < 0.250 O 0.050 P-value 0.100 O 0.010 P-value 0.050 OP-value < 0.010 Sketch the sampling distribution and show the area corresponding to the P-value. 0-3 01 -2 -10 0-3 o (d) Based on your answers in parts (a) to (c), will you reject or fail to reject the null hypothesis? Are the data statistically significant at level a? At the 0.01 level, we reject the null hypothesis and conclude the data are statistically significant. At the 0.01 level, we reject the null hypothesis and conclude the data are not statistically significant. At the 0.01 level, we fail to reject the nut hypothesis and conclude the data are statistically significant. At the 0.01 level, we fail to reject the null hypothesis and conclude the data are not statistically significant -2 -1 . 1 TROTES (e) Interpret your conclusion in the context of the application O There is sufficient evidence at the 0.01…
State the alternative hypotheses for the following claim: For Division I schools, less than 25% of them have a bulldog as their mascot. State the alternative hypotheses for the following claim: For Division I schools, less than 25% of them have a bulldog as their mascot. p = .25 p < .25 p ≥ .25 p ≤ .25
20. Which of the following is a null hypothesis? a. Pregnant women who drink cranberry juice will have lower urine bacterial counts than those who do not drink cranberry juice. b. The urine bacterial count of pregnant women who drink cranberry juice will be lower or equal to that of pregnant women who do not drink the juice. c. There will be a difference between ingestion of cranberry juice and among pregnant women who do and do not have high urine bacterial counts.
A company manufacturing CDs is working on a new technology. A random sample of 646 Internet users were asked: "As you may know, some CDs are being manufactured so that you can only make one copy of the CD after you purchase it. Would you buy a CD with this technology, or would you refuse to buy it even if it was one you would normally buy?" Of these users, 59% responded that they would buy the CD. Complete parts a and b below. a) Create a 99% confidence interval for this percentage. ( 54.008 %, 63.993 %) (Round to three decimal places as needed. Use ascending order.) b) If the company wants to cut the margin of error by two thirds, how many users must they survey? The company must survey a total of (Type a whole number.) users
The average life expectancy of tires produced by the Dunlop Tire Company has been 40,000 miles. Management believes that due to a new production process, the life expectancy of their tires has increased. In order to test the validity of their belief, the correct set of hypotheses is O a. Ho: H > 40,000 Ha:H S 40,000 O b. Ho:H 2 40,000 HaiH 40,000 O d. Ho: H <40,000 H3:H 2 40,000
Five soft drink bottling companies have agreed to implement a time management program in hopes of increasing productivity (measured in the cases of soft drinks bottled per hour). The number of cases of soft drinks bottled per hour before and after the implementation of the program are listed below: Before After 1 500 510 2 475 480 3 525 525, 4 490 495 5 530 533 a. State the appropriate null and alternative hypotheses to test whether the time management has been effective in increasing productivity. b. Calculate the value of the test statistics. c. Set up the appropriate rejection region for the hypotheses above, assuming a = 0.05. c. What is the appropriate conclusion? Justify your answer. d. Refer to Bottling Productivity Narrative. Find the approximate p-value.
2. Economists theorize that the recent recession has affected men more than women because men are typically employed in industries that have been hit hardest by the recession. Women, on the other hand, are typically employed in services which are considered more recession resistant. A sample of 160 men and a sample of 140 women were drawn. In those samples, 20 men were unemployed, and 13 of the women were unemployed. Complete parts a and b below. a. Perform a hypothesis test using a = 0.05 to determine if the unemployment rate for men is higher than the rate for women. Let population 1 be men and population 2 be women. What are the correct null and alternative hypotheses? O B. Ho: P1 - P2 0 What is the test statistic? Zp = (Round to two decimal places as needed.) What is/are the critical value(s)? The critical value(s) is/are (Round to three decimal places as needed. Use a comma to separate answers as needed.) Interpret the result. Choose the correct answer below. O A. Do not reject…
A health care researcher would like to answer the following research question: On average, are for-profit nursing homes larger (based on total number of beds) than facilities of another type (non-profit and governmental)? Compose a null and alternative hypothesis below: H1: H0:
Students in a Psychology Stats class gathered 1st and 2nd year university students to gather self-report data on UFO, sightings during the past year. A year later the same students took the survey after taking LSD. The results of the self-report survey are as follows: Participant ID UFO sightings UFO sightings before LSD after LSD 1 1 2 1 3 2 2 4 1 3 3 1 7 3 A) State the Null and Alternative Hypothesis. B) Find the calculated "t" value and the critical "t" value C) State weather to accept or reject the Null Hypothesis
: The Center for the Study of Violence wants to determine whether a conflict-resolution program in a particular high school alters aggressive behavior among its students. For 10 students, aggression was measured both before and after they participated in the conflict-resolution course. Students Before Participating After Participating 1 10 8 2 3 3 3 4 1 4 8 5 5 8 7 6 9 8 7 5 1 8 7 5 9 1 2 10 7 6 From performing a hypothesis test to determine if the aggression does not differ as a result of the participation in the program, what is the p-value?
Use the traditional method in testing the hypothesis in the problems below. In each problem, state the following:a. State the hypotheses and identify the claim.b. Find the critical value(s)c. Find the test value The manager of the cosmetics section of a large department store wants to determine whether newspaper advertising really does affect sales. For her experiment, she randomly selects 15 items currently in stock and proceeds to establish a baseline. The 15 items are priced at their usual competitive values, and the quantity of each item sold for a 1-week period is recorded. Then, without changing their price, she places a large ad in the newspaper, advertising the 15 items. Again, she records the quantity sold for a 1-week period. The results follow. Item 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15No. of Items Sold Before Ad 25 18 3 42 16 20 23 32 60 40 27 7 13 23 16No. of Items Sold After Ad 32 24 7 40 19 25 23 35 60 43 28 11 12 32 28

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Determine the following ; Conclusion HYPOTHESIS Calculation