69. The sample average unrestrained compressive strengthfor 45 specimens of a particular type of brick was com-puted to be 3107 psi, and the sample standard deviationwas 188. The distribution of unrestrained compressivestrength may be somewhat skewed. Does the data strong-ly indicate that the true average unrestrained compres-sive strength is less than the design value of 3200? Testusing a = .001.

Sample size, n=45 Sample mean, x¯=3107 Sample sd, s=188 α=0.001 Population mean, μ=3200

Answered: 69. The sample average unrestrained…

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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number 7 and 8 pls
Suppose the lengths of human pregnancies are normally distributed with μ = 266 days and o 16 days. Complete parts (a) and (b) below. (a) The figure to the right represents the normal curve with μ = 266 days and o=16 days. The area to the right of X = 290 is 0.0668. Provide two interpretations of this area. Provide one interpretation of the area using the given values. Select the correct choice below and fill in the answer boxes to complete your choice. (Type integers or decimals.) O A. The proportion of human pregnancies that last less than OB. The proportion of human pregnancies that last more than days is days is Provide a second interpretation of the area using the given values. Select the correct choice below and fill in the answer boxes to complete your choice. (Type integers or decimals.) O A. The probability that a randomly selected human pregnancy lasts more than OB. The probability that a randomly selected human pregnancy lasts less than days is days is or more than and days…
A normal distribution has a mean of u= 80 with o= 12. Find the following proportions with the given score: (X < 74). Be sure to illustrate the normal distribution and shade in the region in question.
At a certain high school, every freshman has his or her height The freshman boys have a mean height of 65.2 inches and a standard deviation of 3.2 inches. The freshman girls have a mean height of 63.5 inches and a standard deviation of 2.7 inches. The proportion of of freshman girls has heights between 60 to 65 inches is 0.6133. What is the interpretation of this normal density area? (i) The proportion of freshman having heights between 60 to 65 inches is 0.6133 (ii) The probability that a randomly selected freshman girl have heights between 60 to 65 inches is 0.6133 or 61.33% Oboth (i) and (ii) are correct We can not interpret the given area..
Compute the range and sample standard deviation for strength of the concrete (in psi). 3920, 4070, 3500, 3100, 2930, 3870, 4070, 4010 The range is S= psi. psi (Round to one decimal place as needed.)
Compute the range and sample standard deviation for strength of the concrete (in psi). 3910, 4090, 3500, 3100, 2940, 3830, 4090, 4040
A certain brand produces milk with boxes in a weight of 95 gr. The average weight of 12 samples equals 96.51 gr.Assume that the distribution of the weight of the product is 1.24. Conduct a test about the standart weight of the milk boxes. Does the product still weight 95gr or higher? Write down the z value which you should use for comparison.(Use at least 2 digits after decimal,sensitivity ;0.00)
Assume that a sample is used to estimate a population mean μμ. Find the margin of error that corresponds to a sample of size 16 with a mean of 68.3 and a standard deviation of 17.9 at a confidence level of 99%.Report the margin of error accurate to one decimal place because the sample statistics are presented with this accuracy.E=
Please I need this answered in 30 min.
Suppose the lengths of human pregnancies are normally distributed with p = 266 days and o = 16 days. Complete parts (a) and (b) below. (a) The figure to the right represents the normal curve with u = 266 days and o = 16 days. The area to the right of X= 285 is 0.1175. Provide two interpretations of this area. Provide one interpretation of the area using the given values. Select the correct choice below and fill in the answer boxes to complete your choice. (Type integers or decimals.) O A. The proportion of human pregnancies that last more than days is 266 285 O B. The proportion pregnancies that last less thar days is Provide a second interpretation of the area using the given values. Select the correct choice below and fill in the answer boxes to complete your choice. (Type integers or decimals.) O A. The probability that a randomly selected human pregnancy lasts less than days is B. The probability that a randomly selected human pregnancy lasts more than days is
The lifetime of a Michelin defender tire (in thousands of miles) is normally distributed with mean μ = 41 and standard deviation σ = 7. What proportion of Michelin tires have lifetimes between 35 and 47 thousand miles?
Suppose the lengths of human pregnancies are normally distributed with µ= 266 days ando = 16 days. Complete parts (a) and (b) below. (a) The figure to the right represents the normal curve with u = 266 days and o = 16 days. The area to the left of X= 250 is 0.1587. Provide two interpretations of this area. Provide one interpretation of the area using the given values. Select the correct choice below and fill in the answer boxes to complete your choice. (Type integers or decimals.) O A. The proportion of human pregnancies that last less than days is O B. The proportion of human pregnancies that last more than days is 250 266 Provide a second interpretation of the area using the given values. Select the correct choice below and fill in the answer boxes to complete your choice. (Type integers or decimals.) O A. The probability that a randomly selected human pregnancy lasts more than days is O B. The probability that a randomly selected human pregnancy lasts less than days is (b) The…

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