The accompanying summary quantities resulted from a study in which x was the number of photocopy machines serviced during a routine servicecall and y was the total service time (min).n = 17 (y - y)² = 22,218.08(y-y)² = 2615.58(a) What proportion of observed variation in total service time can be explained by a linear probabilistic relationship between total servicetime and the number of machines serviced? (Give the answer to three decimal places.)(b) Calculate the value of the estimated standard deviation se. (Give the answer to three decimal places.)What is the number of degrees of freedom associated with this estimate?

Answered: Image /qna-images/answer/e9be372b-ce78-4681-b4c6-7f0aa4ad85a1.jpg

Answered: The accompanying summary quantities…

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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Suppose your manager indicates that for a normally distributed data set you are analyzing, your company wants data points between z=−0.5z=-0.5 and z=0.5z=0.5 standard deviations of the mean (or within 0.5 standard deviations of the mean). What percent of the data points will fall in that range?Answer: percent (Enter a number between 0 and 100, not 0 and 1 and round to 2 decimal places)
The Great Plains Railroad is interested in studying how fuel consumption is related to the number of railcars for its trains on a certain route between Oklahoma City and Omaha. A random sample of 10 trains was taken. A residual plot and the output from the regression analysis for these data are shown in the attached picture. A) What is the actual fuel consumption for a fitted value of 102? B) What is the predicted fuel consumption for 100 railcars? Show your work. C) What is the value of the correlation coefficient for the sample? Interpret this value.
To estimate a population mean μ, the sample mean x¯ is often used as an estimator. However, a different estimator is called the sample midrange, given by the formula sample minimum + sample maximum/ 2. (a) The following table shows the values, in thousands of dollars, of 40 randomly selected houses in the city. (i) Calculate the sample midrange for the data. (ii) Explain why the sample midrange might be preferred to the sample mean as an estimator of the population mean. (b) To investigate the sampling distribution of the sample midrange, a simulation is performed in which 100 random samples of size n=40 were selected from the population of house values. For each sample, the sample midrange was calculated and recorded on the following dotplot. The mean of the distribution of sample midranges is $617,000 with standard deviation $136,000. Based on the results of the simulation, explain why the sample mean might be preferred to the sample midrange as an estimator of the population mean.
Suppose P(A) = 0.42, P(B) = 0.48 and P(A and B) = 0.10. Find P(Bc | Aº) : = Question Help: Add Work Submit Question Video (round your answer to three decimal places)
A statistics professor for STAT 250 wants to investigate how long it takes students to complete Exam 1. The times that it took all 715 STAT 250 students in Spring 2022 were recorded in the data set “Time to Complete Exam 1” found in StatCrunch. The time is recorded in minutes. A student who completed the exam in 50:30 (50 minutes and 30 seconds) would be recorded as 50.5 minutes Column Mean Std. dev. Sample 26 (Time) 43.93 7.14 1) Does the mean calculated come from a sampling distribution that is approximately Normal? Check all three conditions of the Central Limit Theorem using one complete sentence for each condition to answer this question 2) Calculate the probability that, in a random sample of 26 students, the mean time to complete Exam 1 is 50 minutes or more. Complete this part by standardizing and using the Standard Normal Table to obtain this probability. Show all work and type all calculations.
Suppose your manager indicates that for a normally distributed data set you are analyzing, your company wants data points between z=−0.6z=-0.6 and z=0.6z=0.6 standard deviations of the mean (or within 0.6 standard deviations of the mean). What percent of the data points will fall in that range?Answer: percent (Enter a number between 0 and 100, not 0 and 1 and round to 2 decimal places)
The toco toucan, the largest member of the toucan family, possesses the largest beak relative to body size of all birds. This exaggerated feature has received various interpretations, such as being a refined adaptation for feeding. However, the large surface area may also be an important mechanism for radiating heat (and hence cooling the bird) as outdoor temperature increases. Here are data for beak heat loss, as a percent of total body heat loss from all sources, at various temperatures in degrees Celsius. [Note: The numerical values in this problem have been modified for testing purposes.] Temperature (oC)(oC) 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Percent heat loss from beak 33 32 33 32 39 43 56 48 44 49 44 56 58 60 60 63 The equation of the least-squares regression line for predicting beak heat loss, as a percent of total body heat loss from all sources, from temperature is: (Use decimal notation. Enter the values of the intercept and slope rounded to two…
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To illustrate the effects of driving under the influence (DUI) of alcohol, a police officer brought a DUI simulator to a local high school. Student reaction time in an emergency was measured with unimpaired vision and also while wearing a pair of special goggles to simulate the effects of alcohol on vision. For a random sample of nine teenagers, the time (in seconds) required to bring the vehicle to a stop from a speed of 60 miles per hour was recorded. Complete parts (a) and (b). Note: A normal probability plot and boxplot of the data indicate that the differences are approximately normally distributed with no outliers. Click the icon to view the data table. (a) Whether the student had unimpaired vision or wore goggles first was randomly selected. Why is this a good idea in designing the experiment? A. This is a good idea in designing the experiment because it controls for any "learning" that may occur in using the simulator. B. This is a good idea in designing the experiment because…
You were asked to help with an analysis of birth weights (BW) of 10,000 infants born in NYC during a certain period of time. The aim of the analysis is to see whether the birth weights of the infants are associated with mothers’ AGE at birth (continuous variable in years), mothers’ current HOUSING status (“own” and “not-own”; “own” is the reference group), and NYC boroughs (the BOROUGH variable contains 5 categories “Manhattan”, “Bronx”, “Brooklyn”, “Queens” and “Staten Island”; “Manhattan” is the reference group). Write down the population model that estimates the effect of mother’s AGE on BW while adjusting for mother’s current HOUSING status. If you use dummy or binary variables, specify what they mean. Write down the population model that estimates the effect of mother’s AGE on BW while adjusting for mother’s current HOUSING status and BOROUGH. If you use dummy or binary variables, specify what they mean. Write down the population model that estimates the effect of mother’s AGE…
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