The "cold start ignition time" of an automobile engine is being investigated by a gasoline manufacturer. Twogasoline formulations were made and the following times, in seconds, were obtained for the same testvehicle.Formulation 1: 1.751.922.622.353.093.152.533.401.91Formulation 2: 1.831.993.133.292.652.872.461.893.35a. Calculate the mean for each formulation.b. Which of the two formulations has a more varied set of data? What is your statistical basis for this?

To calculate: a. Calculate the mean for each formulation. b. Which of the two formulations has a…

Answered: The "cold start ignition time" of an…

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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A survery revealed the amount of pocket money held by each student in a sample of students. The amounts in dollars are: 5,50, 10.20, 3.15, 6.08, 4.85, 4.80, 4.70, 8.52, 7.90, 6.10, 3.50, 5.40, 7.10, 9.60, 6.24, and 4.28. Assume s=2.25. What is the 98% confidence interval for the population mean?
ue to the nature of their positions, air traffic controllers are required to undergo periodic random drug testing. A urine test is typically used due to its low cost. Based on past drug testing, the FAA reports that drug use is estimated at 0.017 among pilots. The urine test will correctly identify 0.96 of pilots using drugs. The test will also correctly identify 0.88 of individuals who do not use drugs. Assuming I was a pilot and tested positive, what is the probability that I am a drug user, given the positive test? NOTE: Remember that you can use the tree diagram to assist you in setting up this question.
NarStor, a computer disk drive manufacturer, claims that the average time to failure for its hard drives is 14,400 hours. You work for a consumer group that has decided to examine this claim. Technicians ran 16 drives continuously for three years. Recently the last drive failed. The time to failure (in hours) are given below. Time Until Failure(Hours) 330 620 1870 2410 4620 6396 7822 8102 8309 12,882 14,419 16,092 18,384 20,916 23,812 25,814 Conduct a hypothesis test to determine whether there is any evidence that the average time to failure is less than the manufacturer’s claim. Use alpha = 0.01 What assumption did you make in performing the test? What is the p-value?
I dont know how to solve these quesitons , would you please solve for me. 1. Email outreach efforts. A medical research group is recruiting people to complete short surveysabout their medical history. For example, one survey asks for information on a person’s familyhistory in regards to cancer. Another survey asks about what topics were discussed during theperson’s last visit to a hospital. So far, as people sign up, they complete an average of just4 surveys, and the standard deviation of the number of surveys is about 2.2. The research groupwants to try a new interface that they think will encourage new enrollees to complete more surveys,where they will randomize each enrollee to either get the new interface or the current interface.How many new enrollees do they need for each interface to detect an effect size of 0.5 surveys perenrollee, if the desired power level is 80%? 2. Work hours and education. The General Social Survey collects data on demographics, education,and work, among…
Which combination would lead you to Fail to Reject H0? α = .01 p-value = .005 α = .05 p-value = .051 α = .01 p-value = .009 α = .05 p-value = .048
Answers: 1a) t = 3.033, reject Ho: there is evidence for a significant increase in the number of tremors b) 377.35 to 423.99
4. Test the claim that the proportion of college students taking Math 13 is the same as it was 10 years ago. Today: x=40, n=100 10 years ago: x=50, n=125. Let @=.05
In a survey, the sample consisted of 1087 adults who were parents of school-aged children. The sample was selected in a way that makes it reasonable to regard it as representative of the population of parents of school-aged children. One question on the survey asked respondents how much time (in hours) per month they spent volunteering at their children's school during the previous school year. The following summary statistics for time volunteered per month are given below. n = 1087 x = 5.5 median = 1 In USE SALT (a) What does the fact that the mean is so much larger than the median tell you about the distribution of time spent volunteering per month? The fact that the mean is much greater than the median suggests that the distribution of times spent volunteering in the sample was negatively skewed. The fact that the mean is much less than the median suggests that the distribution of times spent volunteering in the sample was positively skewed. The fact that the mean is much greater…
Suppose you are a researcher in a hospital. You are experimenting with a new tranquilizer. You collect data from a random sample of 8 patients. The period of effectiveness of the tranquilizer for each patient (in hours) is as follows: 2.3 2.1 2.5 2.8 21 2.5 2.8
Apparently what I put was incorrect.
Scientists did a study to see whether a new fuel additive had any effect on gas mileage (mpg). Seven identical cars were driven for 1 week with normal gas/no additive, and then driven the next week using gas with the additive. The miles-per-gallon was recorded for each vehicle. Please use the appropriate t-test and do the calculations requested below and fill in the blanks. No additive Additive D D2 16 19 3 9 13 16 3 9 15 14 -1 1 17 17 0 0 20 24 4 16 26 28 2 4 25 28 3 9 ∑D=14 ∑D2= 48 For this study, the sample size n = and the mean difference MD = . The SSD = , the variance s2D = , the…
A random sample from a normal population has:n = 8, X-bar = 16, and s = 3. Find the 95% PI for asingle new value from the population.

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