Can someone please explain it to me part d? ASAP??!!! Assume that the helium porosity (in percentage) of coal samples taken from any particular seam is normally distributed with truestandard deviation 0.71.(a) Compute a 95% CI for the true average porosity of a certain seam if the average porosity for 15 specimens from theseam was 4.85. (Round your answers to two decimal places.)4.495.21(b) Compute a 98% CI for true average porosity of another seam based on 15 specimens with a sample average porosityof 4.56. (Round your answers to two decimal places.)4.134.99(c) How large a sample size is necessary if the width of the 95% interval is to be 0.39? (Round your answer up to thenearest whole number.)51specimens(d) What sample size is necessary to estimate true average porosity to within 0.25 with 99% confidence? (Round youranswer up to the nearest whole number.)53X specimensYou may need to use the appropriate table in the Appendix of Tables to answer this question.

Answered: Image /qna-images/answer/da08071a-ff47-4c1d-9f54-27329d510f7f.jpg

Answered: 51 specimens (d) What sample size is…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

A park ranger is searching for bears in a region of the park where on average there are 5 bears per square mile. The bears are solitary independent creatures, so it is reasonable to assume that the numbers of bears in disjoint regions are independent unknowns and that the number expected in any region is proportional to the area of the region. The ranger can also assume that in a very tiny region, say a square inch, it is impossible to find more than one bear. What is the standard deviation in area (in square miles) he has to search in order to find 16 bears?
Suppose that the hemoglobin levels among healthy females are normally distributed with a mean of 14.2 g/dL. Research shows that exactly 95% of healthy females haha a hemoglobin level of below 16.2 g/dL. What is the standard deviation of the distribution of hemoglobin levels in healthy females? Carry your intermediate computations to at least four decimal places. Round your answer to at least two decimal places.
Assume that the helium porosity (in percentage) of coal samples taken from any particular seam is normally distributed with true standard deviation A. Compute a 98% CI for true average porosity of another seam based on n specimens with a sample average porosity of B. n=21 B=5.1 A=0.8 What is the upper bound? Two decimal places
Suppose that the creatine kinase levels among healthy males are normally distributed with a standard deviation of 23 units/L. Research shows that exactly 5% of the healthy males have a creatine kinase level above 153 units/L. What is the mean creatine kinase level in healthy males? Carry your intermediate computations to at least four decimal places. Round your answer to at least one decimal place.
Assume that the helium porosity (in percentage) of coal samples taken from any particular seam is normally distributed with true standard deviation 0.73. (b) Compute a 98% CI for true average porosity of another seam based on 18 specimens with a sample average porosity of 4.56. (Round your answers to two decimal places.)
The absolute viscosity for sunflower oil is supposed to average 0.0311 Pa⋅s at 38 ∘C. Suppose a food scientist collects a random sample of 4 quantities of sunflower oil and computes the mean viscosity for his sample to be x¯=0.0318 Pa⋅s at 38 ∘C. Assume that measurement errors are normally distributed and that the population standard deviation of sunflower oil viscosity is known to be σ=0.0009 Pa⋅s. The scientist will use a one‑sample z‑test for a mean, at a significance level of α=0.01, to evaluate the null hypothesis, H0:μ=0.0311 Pa⋅s against the alternative hypothesis, H1:μ≠0.0311 Pa⋅s. Complete the scientist's analysis by calculating the value of the one-sample z‑statistic, the p‑value, and then deciding whether to reject the null hypothesis. First, compute the z‑statistic, z. Provide your answer precise to two decimal places. Avoid rounding within calculations. z= Determine the P-value of the test using either a table of standard normal critical values or…
In a study, a random sample of 25 specimens collected within a mile downwind from a certain factory contained on the average 2.6 micrograms of suspended benzene-soluble organic matter per cubic meter with standard deviation of 0.60. If 2.6 is used as an estimate of the mean of the population sampled, what can be said with 99 percent confidence about the maximum error?
How large the sample should be taken to estimate the average medical expense of the HHs in the city block with a bound of 50 RO? Use 120 as an approximation of population standard deviation. d) Estimate

Recommended textbooks for you

MATLAB: An Introduction with Applications

Statistics

ISBN:

9781119256830

Author:

Amos Gilat

Publisher:

John Wiley & Sons Inc

Probability and Statistics for Engineering and th…

Statistics

ISBN:

9781305251809

Author:

Jay L. Devore

Publisher:

Cengage Learning

Statistics for The Behavioral Sciences (MindTap C…

Statistics

ISBN:

9781305504912

Author:

Frederick J Gravetter, Larry B. Wallnau

Publisher:

Cengage Learning

MATLAB: An Introduction with Applications

Statistics

ISBN:

9781119256830

Author:

Amos Gilat

Publisher:

John Wiley & Sons Inc

Probability and Statistics for Engineering and th…

Statistics

ISBN:

9781305251809

Author:

Jay L. Devore

Publisher:

Cengage Learning

Statistics for The Behavioral Sciences (MindTap C…

Statistics

ISBN:

9781305504912

Author:

Frederick J Gravetter, Larry B. Wallnau

Publisher:

Cengage Learning

Elementary Statistics: Picturing the World (7th E…

Statistics

ISBN:

9780134683416

Author:

Ron Larson, Betsy Farber

Publisher:

PEARSON

The Basic Practice of Statistics

Statistics

ISBN:

9781319042578

Author:

David S. Moore, William I. Notz, Michael A. Fligner

Publisher:

W. H. Freeman

Introduction to the Practice of Statistics

Statistics

ISBN:

9781319013387

Author:

David S. Moore, George P. McCabe, Bruce A. Craig

Publisher:

W. H. Freeman

SEE MORE TEXTBOOKS

51 specimens (d) What sample size is necessary to estimate true average porosity to within 0.25 with 99% confidence? (Round your answer up to the nearest whole number.) 53 X specimens You may need to use the appropriate table in the Appendix of Tables to answer this question.