Gasoline Use A random sample of 49 drivers used on average 741 gallons of gasoline per year. The standard deviation of the population is 35 gallons.Part: 0 / 2Part 1 of 2(a) Find the 95% confidence interval of the mean for all drivers. Round intermediate answers to at least three decimal places. Round your final answers tothe nearest whole number.<µ<Ś

Sample of size(n)=49sample mean()=741Population standard deviation()=35

Answered: Gasoline Use A random sample of 49…

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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Hospital Noise Levels Noise levels at various area urban hospitals were measured in decibels. The mean of the noise levels in 36 randomly selected corridors was 61.2 decibels, and the standard deviation of the population was 7.3. Find the 99% confidence interval of the true mean. Round your answers to one decimal place. <μ <
Cereals sodium values have a mean of 167 and a standard deviation of 77.3. Find the z-score for the cereal that has a sodium value of 0. How would you interpret this z-score?
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The lengths of pregnancies in a small rural village are normally distributed with a mean of 265 days and a standard deviation of 15 days. In what range would you expect to find the middle 50% of most pregnancies? Between and If you were to draw samples of size 58 from this population, in what range would you expect to find the middle 50% of most averages for the lengths of pregnancies in the sample? Between and Enter your answers as numbers. Your answers should be accurate to 1 decimal places.
The lengths of pregnancies in a small rural village are normally distributed with a mean of 263 days and a standard deviation of 14 days. A distribution of values is normal with a mean of 263 and a standard deviation of 14.What percentage of pregnancies last fewer than 252 days?P(X < 252 days) = _________%
Find standard deviation & 90% confidence interval for population mean (___,___)
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High School Competency Test A mandatory competency test for high school sophomores has a normal distribution with a mean of 380 and a standard deviation of 81. Round the final answers to the nearest whole number and intermediate z-value calculations to 2 decimal places. The top 4% of students receive $500, what is the minimum.co (b) The bottom 2% of students must go to summer school. What is the minimum score you would need to stay out of this group? The minimum score needed to stay out of this group is 0 X $
Soft Drink Consumption A researcher claims that the yearly consumption of soft drinks per person is 52 gallons. In a sample of 58 randomly selected people, the mean of the yearly consumption was 53.1 gallons. The standard deviation of the population is 3.5 gallons. On the basis of the P-value, is the researcher's claim valid at α=0.02? Use a graphing calculator. Find the P-value. Round the answer to at least four decimal places. P-value=
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Prison Sentences The average length of prison term in the United States for white collar crime is 34.9 months. A random sample of 40 prison terms indicated a mean stay of 28.8 months with a standard deviation of 8.9 months. At α=0.01, is there sufficient evidence to conclude that the average stay differs from 34.9 months? Use the P-value method. Use a graphing calculator. Find the P-value. Round the answer to at least four decimal places. P-value=
Breaking Strength of Steel Cable The average breaking strength of a certain brand of steel cable is 2000pounds, with a standard deviation of 100pounds. A sample of 20 cables is selected and tested. Find the sample mean that will cut off the upper 91% of all samples of size 20 taken from the population. Assume the variable is normally distributed. Round intermediate z-value calculations to 2 decimal places and round the final answer to at least 2 decimal places. The sample mean that will cut off the upper 91% of all samples of size 20 is ____ pounds.

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