2. A manufacturer of flashlight batteries claims that the average life of his product will exceed 40hours. A company is willing to buy a very large shipment of batteries if the claim is true. Arandom sample of 36 batteries is tested, and it is found that the sample mean is 45 hours. If thepopulation of batteries has a standard deviation of 5 hours, is it likely that the batteries will bebought?Но:H1:a =Zcri =Zcom =comparisonComputation:DR:Conclusion:

Answered: Image /qna-images/answer/f2758e42-0dcb-453b-9089-cea1388ce95c.jpg

Answered: 2. A manufacturer of flashlight…

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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Currently patrons at the library speak at an average of 64 decibels. Will this average change after the installation of a new computer plug in station? After the plug in station was built, the librarian randomly recorded 69 people speaking at the library. Their average decibel level was 61.7 and their standard deviation was 6. What can be concluded at the α = 0.05 level of significance? H0:H0: ? μ p Select an answer > ≠ < = H1:H1: ? p μ Select an answer = > < ≠ The test statistic ? t z = (please show your answer to 3 decimal places.) The p-value = (Please show your answer to 4 decimal places.)
A company is doing a hypothesis test on the variation of quality from two suppliers. Both distributions are normal, and the populations are independent. use a = 0.01 2 H0:01 HA: 01 > 2 2 02² 10₂² The standard deviation of the first sample is 2.2077 5.1485 is the standard deviation of the second sample. The test statistic is =
To compare the dry braking distances from 30 to 0 miles per hour for two makes of automobiles, a safety engineer conducts braking tests for 35 models of Make A and 35 models of Make B. The mean braking distance for Make A is 43 feet. Assume the population standard deviation is 4.6 feet. The mean braking distance for Make B is 46 feet. Assume the population standard deviation is 4.5 feet. At α=0.10, can the engineer support the claim that the mean braking distances are different for the two makes of automobiles? Assume the samples are random and independent, and the populations are normally distributed. The critical value(s) is/are Find the standardized test statistic z for μ1−μ2.
A population has parameters u = 189.5 and o = 61.9. You intend to draw a random sample of size n = 113. What is the mean of the distribution of sample means? What is the standard deviation of the distribution of sample means? (Report answer accurate to 2 decimal places.)
A population has parameters μ=37μ=37 and σ=54.8σ=54.8. You intend to draw a random sample of size n=209n=209.What is the mean of the distribution of sample means?What is the standard deviation of the distribution of sample means?(Report answer accurate to 2 decimal places.)
QUESTION 9 A population has a standard deviation of 8. What is the minimum sample size needed to estimate a mean to within 2 units with 66.8% confidence? O A. 13 ОВ. 15 ОС. 14 O D. 12 O E. 16 QUESTION 10 A sample of 40 is taken from a population where the population standard deviation is known to be 5. What z should be used for an 78.7% confiden 'a12 estimate of the mean, rounded to five decimal places? O A. 1.24518 O B. 1.24526 OC1 24541 DELL F10 F8 Esc F6 F7 F4 F5 F3 # 2$ % 7 3 4
A population has parameters u = 239.9 and o = 18.4. You intend to draw a random sample of size n = 76. What is the mean of the distribution of sample means? What is the standard deviation of the distribution of sample means? (Report answer accurate to 2 decimal places.)
A sample is selected from a population with A = 150. After a treatment is administered to the individuals, the sample mean is found to be = 140 and the standard deviation is S= 9. If the sample has n = 18 scores, determine whether the sample is sufficient to conclude that the treatment has significant effect. Use a two tail test with a = 0.02. (Assume the population is normally distributed)
Please solve the problem manually
A population has parameters u = 214.3 and o = 73.5. You intend to draw a random sample of size n = 237. What is the mean of the distribution of sample means? What is the standard deviation of the distribution of sample means? (Report answer accurate to 2 decimal places.) = 20

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