Suppose you are the manager of Speedy Oil Change. You think your branch is very quick with oilchanges, but lately you have been getting some customer complaints that it takes too long to get anoil change. You take a random sample of 36 customers and time how long (in minutes) the customermust wait for their oil change. The results are in the table below.422919111027412722262832171525353122133117373325182428214019333014232210(data from http://org.elon.edu/econ/sac/Descriptive.htm)1. Construct a 98% confidence interval for the mean number of minutes it takes for an oil change.(Round each number to 1 decimal place)2. Write a sentence to interpret what the confidence interval in #1 means.3. Using the interval from #1, calculate the point estimate and margin of error for the interval.(1 decimal place)Point Estimate =minutesMargin of Error =minutes

Answered: Image /qna-images/answer/6e02a74e-5077-4938-bccf-32c44dbcd952.jpg

Answered: Suppose you are the manager of Speedy…

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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the following table shows the average number of colds per year for a certain group of people by age group. calculate the average number of colds for all the people to the nearest one-hundreth.
Part II. The data below represents the weights (in kgs) of a sample of 20 giant turtles: 61 65 67 67 69 73 74 74 74 77 77 78 80 84 88 89 92 93 95 96 1. Construct a Stem-and-Leaf display of this data based on the stems 6, 7, 8, 9. 2. Find the percentage of weights greater than or equal to 73 kgs. 3. Find the percentage of weights less than 80 kgs.
The college physical education department offered an advanced first aid course last summer. The scores on the comprehensive final exam were normally distributed, and the z-scores for some of the students are shown below. Robert 1.24 Juan 1.66 Haley −1.84 Joel 0.00 Jan −0.84 Linda 1.68 Which of these students scored above the mean? (Select all that apply.) Which of these students scored on the mean? (Select all that apply.) Which of these students scored below the mean? (Select all that apply.) If the mean score was μ = 140 with standard deviation σ = 15, what was the final exam score for each student?
Here is an example from John and Jenn. When we return exams in our classes, we find it beneficial to share with students information on the distribution of scores. We provide this information so that students will have an idea of how they scored on the exam in comparison to their peers. However, deciding which descriptive information to provide to the class is not always an easy decision. These are modified grades from one of Jenn’s statistics classes. For this data set, the mean is 77, the mode is 92, and the median is 86. If you were the professor of the class, do you think sharing the mean scores on the exam with the class is a representative score of the data set? Why or why not? 9 or 11. The researchers predicted that the more a mother weighed during pregnancy, the higher the fat mass would be in the child. Such findings would support the developmental over nutrition hypothesis, which states that overeating during key developmental times has an influence on the offspring. The…
Consider the following data. −1,2,2,−4,−4,−1−1,2,2,−4,−4,−1 Determine the mean of the given data.
These two questions please.
A federal regulatory agency is investigating an advertised claim that a certain device can increase the gasoline mileage of cars (mpg). Ten such devices are purchased and installed in cars belonging to the agency. Gasoline mileage for each of the cars is recorded both before and after installation. The data are recorded here. Car 1 2 3 4 5 6 7 8 9 10 n x s Before (mpg) 19.1 29.9 17.6 20.2 23.5 26.8 21.7 25.7 19.5 28.2 10 23.22 4.25 After (mpg) 25.8 23.7 28.7 25.4 32.8 19.2 29.6 22.3 25.7 20.1 10 25.33 4.25 Change (mpg) 6.7 −6.2 11.1 5.2 9.3 −7.6 7.9 −3.4 6.2 −8.1 10 2.11 7.54 (a) The cars in the study appear to have grossly different mileages before the devices were installed. Use the change data to test whether there has been a significant gain in mileage after the devices were installed. Use ? = .05. H0: ?after ?before Ha: ?after ?before t = p-value
Below are the number of questions answered correctly by 14 students in a Data Management class on an exam with forty questions. 16 20 22 26 26 27 29 32 34 36 36 37 38 39 What percentile is the student who scored 32?
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9 The table below shows the weights of 8 different bears at a zoo. Type of Bear Asiatic Black Bear Black Bear Brown Bear Panda Bear Polar Bear Sloth Bear Spectacled Bear Sun Bear Weight (pounds) 225 300 550 200 1,000 300 280 100 If the weight of the polar bear is removed, which statement is true? A The mean decreases more than the median because the polar bear is a high outlier. The mean decreases less than the median because the polar bear is a high outlier.

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