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Questions and Answers of Statistics

A delivery truck travels from point A to point B and back using the same route each clay there are four traffic lights on the route. Let Xi denote the number of red lights the truck encounters going
A convenience store has two separate locations in the store where customers can be: checked out as they leave. These locations both have: two cash registers and have two employees that check out
Consider a ferry that can carry both buses and cars on a trip across a waterway. Each trip costs the owner approximately 810. The fee for cars is $3 and the fee for buses is $8. Let X and Y denote
As we shall illustrate in Chapter 12, statistical methods associated with linear and nonlinear models are very important. In fact, exponential functions are often used in a wide variety of scientific
Consider Review Exercise 3.75. It involved Y, the proportion of impurities in a batch and the density function is given by? (a) Find the expected percentage of impurities. (b) Find the expected value
A study conducted at VP1&SU to determine if certain static arm-strength measures have an influence on the "dynamic lift" characteristics of an individual. Twenty-five individuals were subjected to
The grades of a class of 9 students on a midterm report (x) and on the final examination (y) are as follows(a) Estimate the linear regression line.(b) Estimate the final examination grade of a
A study was made on the amount of converted sugar in a certain process at various temperatures. The data were coded and recorded as follows:(a) Estimate the linear regression line.(b) Estimate the
In a certain type of metal test specimen, the normal stress on a specimen is known to be functionally related to the shear resistance. The following is a set of coded experimental data on the two
The amounts of a chemical compound y, which dissolved in 100 grams of water at various temperatures, .r, were recorded as follows:(a) Find the equation of the regression line.(b) Graph the line on a
A mathematics placement test is given to all entering freshmen at a small college. A student who receives a grade below 35 is denied admission to the regular mathematics course and placed in a
A study was made by a retail merchant to determine the relation between weekly advertising expenditures and sales. The following data were recorded:(a) Plot a scatter diagram.(b) Find the equation of
The following data were collected to determine the relationship between pressure and the corresponding scale reading for the purpose of calibration. (a) Find the equation of the regression line. (b)
A study of the amount of rainfall and the quantity of air pollution removed produced the following data:(a) Find the equation of the regression line to predict, the particulate removed from the
The following data are the selling prices z of a certain make and model of used car w years old. Fit a curve of the form ? z?w = ? ? w by means of the nonlinear sample regression equation z = c d w.
The thrust of an engine (y) is a function of exhaust temperature (x) in ?F when other important variables arc held constant. Consider the following data.(a) Plot the data.(b) Fit a simple linear
A study was done to study the effect of ambient temperature x on the electric power consumed by a chemical plant, y. Other factors were held constant and the data were collected from an experimental
The following is a portion of a classic data set called the "pilot plot data" in Fitting Equations to Data by Daniel and Wood, published in 1971. The response y is the acid content of material
A professor in the School of Business in a university polled a dozen colleagues about the number of professional meetings professors attended in the past five years (X) and the number of papers
Assuming that, the ? i ?s are normal, independent with zero means and common variance ?2, show that A, the least squares estimator of ? in ? y?x = a + 0x, is normally distributed with mean a and
For a simple linear regression model where ? i ?s are independent and normally distributed with zero means and equal variances a~, show that, Y and have zero covariance.
With reference to Exercise 11.1, (a) Evaluate s2, (b) Test; the hypothesis that β = 0 against the alternative that β ≠ 0 at the 0.05 level of significance and interpret the
With reference to Exercise 11.2, (a) Evaluate s2; (b) Construct a 95% confidence interval for α; (c) Construct a 95% confidence interval for 0.
With reference to Exercise 11.3, (a) Evaluate s2; (b) Construct a 95% confidence interval for α; (c) Construct a 95% confidence interval for 3.
With reference to Exercise 11.4, (a) Evaluate s2; (b) Construct a 99% confidence interval for α; (c) Construct a 99%. Confidence interval for 3
With reference to Exercise 11.5, (a) Evaluate s2; (b) Construct a 99% confidence interval for α; (c) Construct a 99% confidence interval for 0.
Test the hypothesis that a = 10 in Exercise11.6 against the alternative that α < 10. Use a 0.05 level of significance.
Test the hypothesis that β = 6 in Exercise 11.7 against the alternative that β < 6. Use a 0.025 level of significance.
Using the value of s2 found in Exercise 11.18 (a), construct a 95% confidence interval for μ y׀85 in Exercise 11.2.
With reference to Exercise 11.4, use the value of s2 found in Exercise 11.20(a) to compute(a) A 95% confidence interval for the menu shear resistance when x = 24.5;(b) A 95% prediction interval for a
Using the value of s2 found in Exercise 11.19(a) graph the regression line and the 95% confidence bands for the mean response μ y׀x for the data of Exercise 11.3.
Using the value of s2 found in Exercise 11.19(a), construct a 95% confidence interval for the amount of converted sugar corresponding to x = 1.6 in Exercise 11.3.
With reference to Exercise 11.5, use the value of s2 found in Exercise 11.21(a) to compute(a) A 99% confidence interval for the average amount of chemical that will dissolve in 100 grams of water at
Consider the regression of mileage for certain automobiles, measured in miles per gallon (mpg) on their weight in pounds (wt). The data are from Consumer Reports (April 1997). Part of the SAS output
Show that in the case of a least, squares fit to the simple linear regression model
Consider the situation of Exercise 11.30 but suppose n = 2 (i.e., only two data points are available). Give an argument that the least squares regression line will result in (y1 — y1) = (y2 — y2)
There are important applications in which due to known scientific constraints, the regression line must go through the origin (i.e., the intercept must be zero). In other words, the model should
Given the data set (a) Plot the data. (b) Fit a regression line ''through the origin." (c) Plot the regression line on the graph with the data. (d) Give a general formula for (in terms of the y i and
For the data in Exercise 11.33 find a 95% prediction interval at x = 25.
(a) Find the least squares estimate for the parameter β in the linear equation μ y׀x = 3x.(b) Estimate the regression line passing through the origin for the following data.
Suppose it is not known in Exercise 11.35 whether the true regression should pass through the origin. Estimate the linear model μ y׀x = a + β x and test the hypothesis that α = 0
Suppose that an experimenter postulates a model of the type when in fact an additional variable, say x2, also contributes linearly to the response. The true model is then given by. Compute the
Use an analysis-of-variance approach to test the hypothesis that 0 = 0 against the alternative hypothesis β ≠ 0 in Exercise 11.3 at the 0.05 level of significance.
Organophosphate (OP) compounds are used as pesticides. However, it is important to study their effect on species that are exposed to them. In the laboratory study, some Effects of Organophosphate
Test for linearity of regression in Exercise 11.5. Use a 0.05 level of significance. Comment
Test for linearity of regression in Exercise 11.6. Comment
Transistor gain in an integrated circuit device between emitter and collector (hFE) is related to two variables [Myers and Montgomery (2002)] that can be controlled at the deposition process, emitter
The following data are a result of an investigation as to the effect of reaction temperature x on percent conversion of a chemical process y. [See Myers and Montgomery (2002).] Fit a simple linear
Heat, treating is often used to carburize metal parts such as gears. The thickness of the carburized layer is considered an important feature of the gear, and it contributes to the overall
A regression model is desired relating temperature and the proportion of impurity from a solid substance passing through solid helium. Temperature is listed in degrees centigrade. The data are as
It is of interest to study the effect of population size in various cities in the United States on ozone concentrations. The data consist of the 1999 population in millions and the amount of ozone
Evaluating nitrogen deposition from the atmosphere is a major role of The National Atmospheric Deposition Program (NADP, a partnership of many agencies). NADP is studying atmospheric deposition and
For a particular variety of plant, researchers wanted to develop a formula for predicting the quantity of seeds (grams) as a function of the density of plants. They conducted a study with four levels
Compute and interpret the correlation coefficient for the following grades of 6 students selected atrandom:
Test the hypothesis that p = 0 in Exercise 11.49 against the alternative that p ≠ 0. Use a 0.05 level of significance.
Show the necessary steps in converting the equation r = b/a׀√S x x; to the equivalent form t = r√n-2/√1-r2
The following data were obtained in a study of the relationship between the weight and chest size of infants at birth: (a) Calculate r. (b) Test the null hypothesis that p = 0 against the alternative
With reference to Exercise 11.1 assume that x and y is random variables with a bivariate normal distribution:(a) Calculate r.(b) Test the hypothesis that p = 0 against the alternative that p ≠ 0 at
With reference to Exercise 11.9, assume a bivariate normal distribution for x and y.(a) Calculate r.(b) Test the null hypothesis that p = —0.5 against the alternative that p < —0.5 at the
With reference to Exercise 11.6, conclusions, construct(a) A 95% confidence interval for the average course grade of students who make a 35 on the placement test;(b) A 95% prediction interval for the
The Statistics Consulting Center at Virginia Polytechnic Institute and State University analyzed data on normal woodchucks for the Department of Veterinary Medicine. The variables of interest were
The amounts of solids removed from a particular material when exposed to drying periods of different lengths are as shown. (a) Estimate the linear regression line. (b) Test at the 0.05 level of
With reference to Exercise 11.7 construct(a) A 95% confidence interval for the average weekly sales when $45 is spent on advertising;(b) A 95% prediction interval for the weekly sales when 845 is
An experiment was designed for the Department of Materials Engineering at Virginia Polytechnic Institute and State University to study hydrogen embrittlement properties based on electrolytic hydrogen
The following data represent the chemistry grades for a random sample of 12 freshmen at a certain college along with their scores on an intelligence test administered while they were still seniors in
For the simple linear regression model, prove that E (s2) = a d.
The business section of the Washington Times in March of 1997 listed 21 different used computers and printers and their sale prices. Also listed was the average hover bid. Partial results from the
Consider the vehicle data in Figure from Consumer Reports. Weight is in tons, mileage in miles per gallon, and drive ratio is also indicated. A regression model was fitted relating weight x to
Observations on the yield of a chemical reaction taken at various temperatures were recorded as follows: (a) Plot the data. (b) Does it appear from the plot as if the relationship is linear? (c) Fit
Physical fitness testing is an important as aspect of athletic training. A common measure of the magnitude of cardiovascular fitness is the maximum volume of oxygen uptake during a strenuous
Suppose the scientist postulates a model Yi = a + β x i + ε i, i — \,2... n, and α is a known value, not necessarily zero.(a) What is the appropriate least squares estimator of β Justify your
In Exercise 11.30, the student n was required to show that below, standard simple linear regression model. Does the same hold for a model with zero intercept? Show why or whynot.
Suppose in Review Exercise 11.60 that we are also given the number of class periods missed by the 12 students taking the chemistry course. The complete data are shown next. (a) Fit a multiple linear
In Applied Spectroscopy, the infrared reflectance spectra properties of a viscous liquid used in the electronics industry as a lubricant were studied. The designed experiment consisted of the effect
A set of experimental runs was made to determine a way of predicting cooking time y at various levels of oven width x1, and flue temperature x2. The coded data were recorded as follows. Estimate the
An experiment was conducted to determine if the weight of an animal can be predicted after a given period of time on the basis of the initial weight of the animal and the amount of feed that was
(a) Fit a multiple regression equation of the form μ Y׀x = β0 + β1x1 + β2x2 to the data of Example 11.8.(b) Estimate the yield of the chemical reaction for a temperature of 225° C.
An experiment was conducted on a new model of a particular make of an automobile to determine the stopping distance at various speeds. The following data were recorded. (a) Fit a multiple regression
An experiment was conducted in order to determine if cerebral blood flow in human beings can be predicted from arterial oxygen tension (millimeters of mercury). Fifteen patients were used in the
The following is a set of coded experimental data on the compressive strength of a particular alloy at various values of the concentration of some additive: (a) Estimate the quadratic regression
The electric power consumed each month by a chemical plant is thought to be related to the average ambient temperature x1, the number of days in the month x2, the average product purity x3, and the
The electric power consumed each month by a chemical plant is thought to be related to the average ambient temperature x1, the number of days in the month x2, the average product purity x3, and the
The personnel department of a certain industrial firm used 12 subjects in a study to determine the relationship between job performance rating (y) and scores of four tests. The data are as
The following data reflect information taken from 17 U.S. Naval hospitals at various sites around the world. The regressors are workload variables, that is, items that result in the need for
An experiment was conducted to study the size of squid eaten by sharks and tuna. The regressor variables are characteristics of the beak or mouth of the squid. The regressor variables and response
Twenty-three student teachers took part in an evaluation program designed to measure teacher effectiveness and determine what factors are important. Eleven female instructors took part. The response
A study was performed on wear of a bearing y and its relationship to x1 = oil viscosity and x2 = load. The following data were obtained. [Prom Response Surface Methodology, Myers and Montgomery
An engineer at a semiconductor company wants to model the relationship between the device gain and hFE(y) and three parameters: emitter-RS (x1), base-RS (x2), and emitter-to-base-RS (x3). The data
For the data of Exercise 12.2, estimate a2.
For the data of Exercise 12.3, estimate a2.
For the data of Exercise 12.9, estimate a2.
Obtain estimates of the variances and the covariance of the estimator’s b1 and b2 of Exercise 12.2 on
Referring to Exercise 12.9 find the estimate of (a) σ2 b2. (b) Cov (b1 ‘64).
Using the data of Exercise 12.2 and the estimate of a2 from the exercise 12.17, compute 95% confidence intervals for the predicted response and the mean response when x1 = 900 and x2 = 1.00.
For Exercise 12.8, construct a 90% confidence interval for the mean compressive strength when the concentration is x = 19.5 and a quadratic model is used
Using the data of Exercise 12.9 and the estimate of a2 from Exercise 12.19 compute, 95% confidence intervals for the predicted response and the mean response when x1 = 75, x2 = 24, x3 = 90, and x4 =
For the model of Exercise 12.7, test the hypothesis that β2 = 0 at the 0.05 level of significance against the alternative that β2 ≠ 0.
For the model of Exercise 12.2, test the hypothesis that β 1 = 0 at the 0.05 level of significance against the alternative that β1 ≠ 0,
For the model Exercise 12.3, test the hypothesis that β1 = 2 against the alternative that β1 ≠ 2? Use a P-value in your conclusion.
Consider the following data that is listed in Exercise 12.15. (a) Estimate ?2 using multiple regression of y on x1 and x2. (b) Compute predicted values, a 95% confidence; inter value for mean wear,

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