The strength of the cubic concrete of the first line production is 110 N/mm² and standard deviation =12 N/mm² and for the second line production is 95 N/mm² and standard deviation =10 N/mm². If two samples are taken from each line, n=100X for each and the strength are tested, find the probability that the strength of 1 line greater than the 2nd line by: a- 17 N/mm² or more b- 35 N/mm² or more x=0.74

The strength of the cubic concrete of the first line production is 110 N/mm² and standard deviation =12 N/mm² and for the second line production is 95 N/mm² and standard deviation =10 N/mm². If two samples are taken from each line, n=100X for each and the strength are tested, find the probability that the strength of 1 line greater than the 2nd line by: a- 17 N/mm² or more b- 35 N/mm² or more x=0.74

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

See similar textbooks

Similar questions

The scores on a test are normally distributed with a mean of 150 and a standard deviation of 30. Find the score that is 2 1/2 standard deviations above the mean.
Does it take a different amount of time for seeds to germinate if they are near rock music that is continuously playing compared to being near classical music? The 48 seeds that were exposed to rock music took an average of 28 days to germinate. The standard deviation was 13 days. The 47 seeds that were exposed to classical music took an average of 32 days to germinate. The standard deviation for these seeds was 10 days. What can be concluded at the a - 0.01 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 Select an answers Select an answerv (please enter a decimal) Hị: Select an answer Select an answer Select an answer v (Please enter a decimal) 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 g. Thus, the final conclusion is that . answer v the null…
Is when the population standard deviation and variance are unknown. Justin wants to know whether a commonly prescribed drug does improvethe attention span of students with attention deficit disorder (ADD). He knows that the mean attention span for students with ADD who are not taking the drug is 2.3 minutes long. His sample of 12 students taking the drug yielded a mean of 4.6 minutes. Justin can find no information regarding σx, so he calculated s2x =1.96. (1) Create your own example of a Related/Paired Samples t-Test. You don't have to solve this example, but I want you to demonstrate that you understand the methodology (the way a study is designed) of the Paired-Samples t-Test. Include the following: IV: DV: Null Hypothesis: Alternative Hypothesis: I want you to show me that you know how to solve and interpret the results from a Paired - Samples t-Test. 2. A researcher studies the effect of cognitive psychotherapy on positive self-regard. The number of positive statements…
A sumple from a normal population with mu = 50 and sigma = 6 of M=48.20, . the sample mean.corresponds to tz = - 1.50 , then how many scores are in the sample?
The mean weight of 500 male students in a certain college is 151 lbs. and the standard deviation is 15 lbs. Assuming the weights are normally distributed find how many students weigh (a) between 120 and 155 lbs. and (b) more than 185 lbs.
suppose the average time to fill a routine prescription at a local pharmacy is 35 minutes based on the time the physician places the order to the time it is dispensed. assume the standard deviation is 11 minutes. what is the Z-score for x=48 а. 4.48 b. 4.36 с. 3.18 d. 1.18 е. 0.11
Greg is in his first semester at a university and is taking a calculus course with a large enrollment. He just took the first midterm exam and is nervous about his score. Among all the students in the course, the mean of the exam was 85 with a standard deviation of 15.Find that grag has obtain less then 95.
on an exam, Tom scores 12 points above the mean and has a z-score of z=+2.00. the standard deviation for the set of exam scores must be either σ=6 or σ=-6. True or False
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…