A researcher wants to investigate the relationship between the length of a service call (in minutes) between a client and a computer technician, and the number of electronic components in the computer that must be repaired or replaced. The data is given in Table Q3. (a) Determine a relationship between the two variables mentioned above and comment on the relationship. (b) Estimate the number of components that need to be repaired if a customer spends half an hour on the phone for a service call (c) Estimate the length of the service call if a client has an issue that requires 12 components to be fixed.

A researcher wants to investigate the relationship between the length of a service call (in minutes) between a client and a computer technician, and the number of electronic components in the computer that must be repaired or replaced. The data is given in Table Q3. (a) Determine a relationship between the two variables mentioned above and comment on the relationship. (b) Estimate the number of components that need to be repaired if a customer spends half an hour on the phone for a service call (c) Estimate the length of the service call if a client has an issue that requires 12 components to be fixed.

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

9. The chief executive of Rex Cars wants to investigate the relationship between the number of new car sales and the amount of money spent on advertising. She collects data from company records on the number of new car sales, y, and the cost of advertising each year, x (£000). The data are shown in the table below. Cost of advertising (£000), (x) Number of new car sale, Year (y) 2005 120 4240 2006 126 4380 2007 132 4420 2008 134 4440 2009 137 4430 2010 144 4520 2011 148 4590 2012 150 4660 2013 153 4700 2014 158 4790 a. Use your calculator to find the equation, y = a + bx, of the line of best fit (the least squares regression line of y on x). b. Interpret the value of a. c. Calculate the predicted number of car sales made in 2015 if the company spends £163 000 on advertising.
Suppose that fund-raisers at a university call recent graduates to request donations for campus outreach programs. They report the following information for last year's graduates. Size of donation Proportion of calls 0.40 $0 0.30 0.25 Three attempts were made to contact each graduate. A donation of $0 was recorded both for those who were contacted but declined to make a donation and for those who were not reached in three attempts. Consider the variable x = amount of donation for a person selected at random from the population of last year's graduates of this university. (a) Write a few sentences describing what donation amounts you would expect to see if the value of x was observed for each of 1,000 graduates. to donate $25, and roughly $10 $25 $50 (c) What is P(x ≥ 25)? You would expect roughly of the graduates to donate nothing, roughly frequencies would be close to, but not exactly, these values. The four frequencies would add to (d) What is P(x > 0)? 0.05 (b) What is the most…
The cholesterol level (in mg/dL) of 5 patients who had heart attacks was measured two days after the heart attack and then again four days after the heart attack. The researchers want to see if the cholesterol level of patients who have heart attacks reduces as the time since their heart attack increases. The data is given in the table below. Patient Day 2 (L1) Day 4 (L2) 1 241 288 2 186 190 3 226 238 4 160 146 224 200 Compute differences as L1 - L2 a.) Use your T184 to compute the value of d Round final answer to 2 decimal places. Include units on your answer. mg/dL - P b.) Use your TI84 to compute the value of sa. Round final answer to 2 decimal places. Include units on your answer. mg/dL = Ps
Shelia’s doctor is concerned that she may suffer from gestational diabetes (high blood glucose levels during pregnancy). There is variation both in the actual glucose level and in the blood test that measures the level. A patient is classified as having gestational diabetes if her glucose level is above 136 milligrams per deciliter (mg/dl) one hour after ingesting a sugary drink. Shelia’s measured glucose level one hour after the sugary drink varies according to the Normal distribution with μ = 125 mg/dl and σ = 11 mg/dl. a)What are the mean and standard deviation of the distribution of sample proportion if measurements are made instead on 40 separate days? b)If measurements are made on 40 separate days and the mean result is compared with the criterion 140 mg/dl, what is the probability that Shelia is diagnosed as having gestational diabetes? c)Let’s consider what could happen if we took 40 separate measurements from Shelia. What is the blood glucose level L such that the probability…
please answer correctly:
This value represents how much a change in one variable can be predicted from its relationship witha completely different variable .......
The mtcars data set contains data on 32 cars from the 1974 Motor Trend US magazine. The data set has 11 variables that measure different aspects of the cars, such as miles per gallon (mpg), horsepower (hp), weight (wt), and number of cylinders (cyl). The data set can be used to study the relationship between fuel consumption and car performance, as well as other factors that affect the efficiency and design of the cars. What is the maximum and minimum number of the range regarding the explanatory variable for which the regression model can make valid predictions?
Cellulon, a manufacturer of home insulation, wants to develop guidelines for builders and consumers on how the thickness of the insulation in the attic of a home and the outdoor temperature affect natural gas consumption. In the laboratory, it varied the insulation thickness and temperature. A few of the findings are: Monthly Natural Gas Consumption (cubic feet), Thickness of Insulation (inches), Outdoor Temperature (ºF), y x1 x2 30.3 6.0 40.0 24.2 12 40 27.9 8 49 On the basis of the sample results, the regression equation is: yˆy⁢^⁢ = 56.26 − 0.66x1 − 0.59x2 How much natural gas can homeowners expect to use per month if they install 6 inches of insulation and the outdoor temperature is 40 degrees F? (Round your answer to 2 decimal places.) What effect would installing 7 inches of insulation instead of 6 have on the monthly natural gas consumption (assuming the outdoor temperature remains at 40 degrees F)? (Round your answers…
Suppose a researcher collects data on the air pollution levels, measured in milligrams per cubic meter, for both urban and rural areas in 35 states. The data is plotted with urban air pollution levels on the horizontal axis and rural air pollution levels on the vertical axis. Nevada is an outlier in the ?x‑direction. What must be true about this state? The urban air pollution levels for this state are much higher or lower than the rest of the states in the data set. The rural air pollution levels for this state are much higher or much lower than the rest of the states in the data set. This state is an influential observation. The rural air pollution levels for this state are much higher or lower than other states in the data set that have similar urban air pollution levels. The absolute value of the residual of this state is large.
For the following situations, identify the type of variable (qualitative, nominal, ordinal, quantitative, discrete, continuous, interval, ratio), multiple types may apply. 1) Data of weight gain of rats fed only junk food for four weeks in an experiment. 2) Data collected from the order that students finsih their exam. 3) Time it takes for a car battery to die
Pls help to solve this homwork
You collect data of average annual returns for Amazon Stock and Microsoft Stock and make the following table: (This data can be copied into Excel.) You use this data to answer the research question: are true population Amazon Returns greater than true population Microsoft Returns? What is your point estimate of the difference in Amazon Returns and Microsoft Returns? Enter your answer as a positive number. Round your answer to four decimal places.