Gasoline Use A random sample of 36 drivers used on average 747 gallons of gasoline per year. The standarddeviation of the population is 32 gallons.Part: 0 / 2Part 1 of 2(a) Find the 99% confidence interval of the mean for all drivers. Round intermediate answers to at least threedecimal places. Round your final answers to the nearest whole number.<μ<oloºo

Answered: Image /qna-images/answer/466b87e9-c94c-46d8-b320-2a301526cf6a.jpg

Answered: Gasoline Use A random sample of 36…

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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Efficient manufacturing: Efficiency experts study the processes used to manufacture items in order to make them as efficient as possible. One of the steps used to manufacture a metal clamp involves the drilling of three holes. In a sample of 50 clamps, the mean time to complete this step was 53.3 seconds. Assume that the population standard deviation is a = 8 seconds. Round the critical value to no less than three decimal places. Part: 0 / 2 Part 1 of 2 (a) Construct a 99.8% confidence interval for the mean time needed to complete this step. Round the answer to at least one decimal place. A 99,8% confidence interval for the mean is << Part: 1/2 Part 2 of 2 (b) Find the sample size needed so that a 99.9% confidence interval will have margin of error of 1.5. A sample size of is needed in order to obtain a 99.9% confidence interval with a margin error of 1.5. Round the sample size up to the nearest integer.
Breaking Strength of Cable A special cable has a breaking strength of 800 pounds. The standard deviation of the population is 12 pounds. A researcher selects a sample of 23 cables and finds that the average breaking strength is 793 pounds. Can he reject the claim that the breaking strength is 800 pounds? Use the P-value method with a 0.05 level of significance. Assume that the variable is normally distributed. Use a graphing calculator. Part: 0/4 Part 1 of 4 (a) State the hypotheses and Identify the claim. Ho (Choose one) H₂: (Choose one) This hypothesis test is a (Choose one) test. 000-0 H G 民留〗f g E
Calcium levels in people are normally distributed with a mean of 9.7 mgdL and a standard deviation of 0.5 mgdL . Individuals with calcium levels in the bottom 10% of the population are considered to have low calcium levels. Find the calcium level that is the borderline between low calcium levels and those not considered low. Carry your intermediate computations to at least four decimal places. Round your answer to one decimal place.
Find the left and right chi square values, then give the confidence interval. Sample Variance s 15.99 %3D Confidence Level c = 0.90 and Sample Size n = 13 and x %3D %3D At the 90 % level of confidence the population variance is between and (Round all answers to 3 decimal places)
K Question 13, 6.2.22-T > HW Score: 86%, 17.2 of 20 points Points: 0 of 1 View an example Get more help. Assume that adults have IQ scores that are normally distributed with a mean of 102.2 and a standard deviation 18.5. Find the first quartile Q₁, which is the IQ score separating the bottom 25% from the top 75%. (Hint: Draw a graph.) The first quartile is (Type an integer or decimal rounded to one decimal place as needed.) Save Clear all Check answer correct: 1 Actate Window
Age of College Students Find the 90% confidence intervals for the variance and standard deviation of the ages of seniors at Oak Park College if a random sample of 20 students has a standard deviation of 2.2 years. Assume the variable is normally distributed. Use the chi-square distribution table to find any chi- square values to three decimal places. Round the final answers to one decimal place.
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=
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=
Qualifying Test Scores To qualify for a medical study, an applicant must have a systolic blood pressure in the 70% of the mlddle range. If the systollc blood pressure Is normally distributed with a mean of 120 and a standard deviation of 3, find the upper and lower limits of blood pressure a person must have to qualify for the study. Round final answers to 1 decimal place and Intermediate z-value calculations to 2 decimal places. Applicants must have a lower blood pressure limit of and an upper blood pressure limit of to qualify for the study. Save For Later Submit Assi Check 2021 McGraw-Hill Education. All Rights Reserved. Terms of Use Privacy A
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.
You measure 30 watermelons' weights, and find they have a mean weight of 67 ounces. Assume the population standard deviation is 9.3 ounces. Based on this, construct a 88% confidence interval for the true population mean watermelon weight.Give your answers as decimals, to two placesx ± M.O.E. ______ ± ___________ ounces

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