According to Chemical Engineering, an important property of fiber is its water absorbency. The averagepercent absorbency of 12 randomly selected pieces of cotton fiber was found to be 20 with a standard deviationof 1.5. A random sample of 12 pieces of acetate yielded an average percent of 12 with a standard deviationof 1.25. Determine the t table in three decimal places if we wanted to know if cotton is more absorbent than acetate at asignificance level of 0.05.Blank 1 Determine the t calculated in three decimal places. Blank 2 Is there strong evidence that the meanpercent absorbency is significantly higher for cotton fiber than for acetate? Assume that the percent absorbency is approximatelynormally distributed and that the population variances in percent absorbency for the two fibers are the same. yes or no. Blank 3

The question is about hypo. testing Given : Randomly selected pieces of cotton fiber ( n1 ) = 12…

Answered: According to Chemical Engineering, an…

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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Similar questions

Is the data accurate (mean = 97% of true value or 2% error) or precise (sd < 0.1)? If not, give ONE possible source of error.
The duration of flights between two locations is normally distributed with a mean of 6 hours and a standard deviation of 45 minutes. Approximately what percentage of these flights can be expected to take between 7 and 8 hours?
The body temperatures of a group of healthy adults have a bell-shaped distribution with a mean of 98.39°F and a standard deviation of 0.56°F. Using the empirical rule, find each approximate percentage below. a. What is the approximate percentage healthy adults with body temperatures within 2 standard deviations of the mean, or between 97.27°F and 99.51°F? b. What is the approximate percentage of healthy adults with body temperatures between 96.71°F and 100.07°F? a. Approximately % of healthy adults in this group have body temperatures within 2 standard deviations of the mean, or between 97.27°F and 99.51°F. (Type an integer or a decimal. Do not round.) b. Approximately% of healthy adults in this group have body temperatures between 96.71°F and 100.07°F. (Type an integer or a decimal. Do not round.)
The body temperatures of a group of healthy adults have a bell-shaped distribution with a mean of 98.33°F and a standard deviation of 0.52°F. Using the empirical rule, find each approximate percentage below a. What is the approximate percentage of healthy adults with body temperatures within 3 standard deviations of the mean, or between 96.77F and 99.89°F? b. What is the approximate percentage of healthy adults with body temperatures between 97.29°F and 99.37°F? a. Approximately% of healthy adults in this group have body temperatures within 3 standard deviations of the mean, or between 96.77°F and 99.89°F. (Type an integer or a decimal. Do not round.)
It takes an average of 14.5 minutes for blood to begin clotting after an injury. An EMT wants to see if the average will increase if the patient is immediately told the truth about the injury. The EMT randomly selected 70 injured patients to immediately tell the truth about the injury and noticed that they averaged 16.3 minutes for their blood to begin clotting after their injury. Their standard deviation was 4.75 minutes. What can be concluded at the the α = 0.10 level of significance? a. For this study, we should use [Select an answer b. The null and alternative hypotheses would be: Ho: ? Select an answer H₁: ? Select an answer ✓ c. The test statistic ? = (please show your answer to 3 decimal places.) d. The p-value = (Please show your answer to 4 decimal places.) e. The p-value is ? ✓ a f. Based on this, we should [Select an answer the null hypothesis. g. Thus, the final conclusion is that ... O The data suggest the populaton mean is significantly greater than 14.5 at a = 0.10, so…
Humerus bones from the same species of animal have approximately the same length-to-width ratios. It is known that Species A has a mean ratio of 5.9. Suppose that 100 fossil humerus bones were unearthed at a site where Species A is known to have flourished. (We assume that all bones are from the same species.) The length-to-width ratios of these bones have a sample mean 5.6 and sample standard deviation 0.25. Can we conclude that the mean ratio of these bones is significantly smaller than those of Species A? Test with a 0.01 significance level. What is the standard error?
A fruit grower wants to test a new spray that a manufacturer claims will reduce the loss due to insect damage. She sprays 20 trees with the new spray and 20 trees with the standard spray. The following data were recorded: New Spray Standard Spray Mean yield per tree(lb) 240 227 Standard deviation 31.3 28.6 Do the data provide evidence that the new spray increases the yield per tree?
In 16 women with diabetes, the morning blood sugar mean was 49.4 with a standard deviation of 24.0. In normal healthy women, the mean was 47.0. From the sample information, can we conclude that the blood sugar mean in women with rheumatoid arthritis is greater than that in normal women? Assume a significance level of 0.05.
The average life span of one particular brand of refrigerator is 12 years with a standard deviation of 0.8. Find the percentage of the refigerators that last between 10 and 14.5 years. O 99.3% 99.9% 95.9% 97.8% ▶
Exam scores in a large class are normally distributed with a mean of 15.7 and a standard deviation of 7.43. Rana's score on the exam was 9, and Sara's score was 25. The absolute value for the difference between the two ladies z-score is O a. 4.5760 O b. 2.4226 O c. 1.2517 O d. 2.1534
In a large section of a statistics class, the points for the final exam are normally distributed, with a mean of 71and a standard deviation of 8. Grades are assigned such that the top 10% receive A's, the next 20% received B's, the middle 40% receive C's, the next 20% receive D's, and the bottom 10% receive F's. Find the lowest score on the final exam that would qualify a student for an A, a B, a C, and a D.
The weights of people in a certain population are normally distributed with a mean of 159 lb and a standard deviation of 24 lb. Determine the sampling distribution of the mean for samples of size 5.

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