Practice Problems a) Explain what is meant by " is an unbiased estimator of the parameter ". b) Why is it desirable for a sample statistic to be unbiased? c) and are unbiased estimators of ______ and ______ respectively. 6. Acu-Copiers sells and services the Acu-500 copying machine. As part of its sta
Simple Linear Regression Model. See attached file for full problem description. 1. For the simple linear regression model a) Does this model refer to the population or only to a sample from the population? b) Explain what represents. c) Does vary? d) Which term(s) in the statistical model give the random v
1. I need to analyze the data in Worksheet 5-5 (attached). This data is real data that was collected by a doctor who specialized in leg and knee injuries. He gathered data from 43 people, indicated by their initials. Each person was required to perform three anterior (frontward) lunges with the right leg followed by three with t
Use linear regression to determine if there is a statistical correlation between the unemployment rate and the residential mortgage bank-charge off rate. Answer the following questions. Table 1. Quarterly Unemployment Rate1996 - 2006 Year Q1 Q2 Q3 Q4 1996 5.53 5.5 5.27 5.33 1997 5.23 5 4.86 4.67 1998 4.63 4
Identify a business research issue, problem, or opportunity facing a Learning Team member's organization that can be examined using regression analysis. Then, use the Internet or other resources to collect data pertaining to your selection. Prepare a paper examining a regression analysis on your collected data. Begin by describi
Ed Norris has developed a Web site for his used textbook business at State University. To sell advertising he needs to forecast the number of site visits he expects in the future. For the last 6 months he has had the following number of site visits: Month 1 2 3 4 5
Marketing Research, Regression Questions. See attached file for full problem description.
1. A random sample of 200 patients admitted to an adult intensive care unit (ICU) was collected to examine factors associated with death during hospital stay for ICU patients. Data was also collected on patient's age (in years), race, whether the patient had an infection at the time of ICU admission, and whether the patient had
First run a regression analysis using the BENEFITS column of 288 data points in the AIU data set as the independent variable and the INTRINSIC job satisfaction column of 288 data points in the AIU data set as the dependent variable. Create a graph with the trendline displayed. What is the least squares regression line equation?
One of the major uses of multiple regression models is in forecasting a Y value given certain values of the independent X variables. Can you give an example of this type of multiple regression from your workplace? Explain your answer.
The following information is referenced in questions 9 through 11: A random sample of 200 patients admitted to an adult intensive care unit (ICU) was collected to examine factors associated with death during hospital stay for ICU patients. Data was also collected on patient's age (in years), whether the patient had an infectio
The following information is referenced in questions 15 through 19. The Framingham Heart Study was a landmark study in epidemiology in that it was the first prospective study of cardiovascular disease and identified the concept of risk factors and their joint effects. The study began in 1948 and 4,434 randomly selected resid
Suppose you are doing research on the differences in wages earned by men and women in the U.S. workforce. You gain access to a data set that contains information on a random sample of 534 U.S. workers surveyed in 1985. The data set contains information about the hourly wage (in U.S. dollars) and the sex of each of the workers su
A case-control study is performed to study the relationship between esophageal cancer and an exposure (exposure A). Esophageal cancer is a very rare disease (prevalence <<< 1%) in the general population. The cases were 100 persons with the cancer of whom 30 had exposure A. The cases were a random sample of individuals with cance
Data from a study of 534 U.S. workers from 1985 includes information about each worker's hourly wage (measured in U.S. dollars/hour) and age (measured in years). First, linear regression is performed to estimate the relationship between hourly wage and age (years), and the resulting slope of age is 0.08, and correlation coeffici
1. The chart below gives sales data (in dollars) for McTeale, small auto-parts supplier. JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2000 414 482 396 530 551 396 365 415 424 485 684 802 2001 457 432 465 598 632 424 392 476 489 555 768 883 2002 505 477 534 636 696 466 442 506 531 610 825 973 i. Plot the sales
Using Statdisk 10.4 version 1) Captopril is a drug designed to lower systolic blood pressure. When subjects were tested with this drug, their systolic blood pressure readings were measured before and after the drug was taken, with the results given in the accompanying table. Is there sufficient evidence to support the claim
Find the regression equation, letting the first variable be the independent (x) variable. Find the indicated predicted values. Supermodel Heights and Weights - Find the best predicted weight of a supermodel who is 72 in. tall. Height (in.) 70,70.5,68,65,70,70,70,70,71 Weight (lb) 117,119,105,115,119,127,113,123,115
1. A random sample of 200 patients admitted to an adult intensive care unit (ICU) was collected to examine factors associated with death during hospital stay for ICU patients. Data was also collected on patient's age (in years), race, whether the patient had an infection at the time of ICU admission, and whether the patient had
See attached file for full problem description. Asian/Pacific Islander Adolescent Sexual Orientation and Suicide Risk in Guam. The following exercise involves information from the July 2004 AJPH article, The authors performed both simple and multiple logistic regressions to estimate the association between having thou
(1) Find the regression equation based on the following information: avg midterm score = 70 (st dev = 10) avg final score = 55 (st dev = 20) r = 0.60 (2) The regression equation for predicting height from weight is: height = 0.047 * weight + 62.4 What does the slope mean? See attached file for full problem descr
The following data are selling prices z of a certain make and model of used cars w years old: (see table below) a) Fit a curve of the form z = cd^w by means of the nonlinear sample regression equation z = cd^w. Hint: use logarithmic transformations. b) Is d significantly different from 1 at the 0.05 significance level?
Utilize Statdisk version 10.4 only. 1) Open the Bears data set and use the values for age (x) and the values for weight (y) to find the following. (Ages are in months and weights are in pounds) a. Display the scatterplot of the paired age/weight data. Based on that scatterplot, does thee appear to be a relationship between
The response (y) variable is weight in pounds, and the predictor (x) variables are HT (height in inches), WAIST (waist circumference in cm) and CHOL (cholesterol in mg). Predictor (x) Variables P-Value R² Adjusted R² Regression Equation HT, WAIST, CHOL 0.000 0.880 0.870 Y = -199 + 2.55 HT + 2.18 WAIST - 0.00534 CHOL HT, W
Find: (a) explained variation (b) unexplained variation (c) total variation (d) coefficient of determination (e) standard error of estimates s^e Listed below are budgets in millions of dollars and the gross receipts in millions of dollars from randomly selected movies. Budget 62 90 50 35 200 100 90 Gross 65 64 48 57
Finding the equation of the regression line and making predictions. See attached file for full problem description.
3.3 The service life of a battery used in a cardiac pacemaker is assumed to be normally distributed. A random sample of 10 batteries is subjected to an accelerated life test by running them continuously at an elevated temperature until failure, and the following lifetimes (in hours) are obtained: 25.5, 26.1, 26.8, 23.2, 24.2,
Barron's conducts an annual review of online brokers, including both brokers that can be accessed via a Web browser, as well as direct-access brokers that connect customers directly connected with the broker's network server. Each broker's offerings and performance are evaluated in six areas using a point value of 0-5 in each c
The lapping process, which is used to grind certain silicon wafers to the proper thickness, is acceptable only if 'sigma', the population standard deviation of the thickness of dice cut from the wafers, is at most 0.50 mil. Use the 0.05 level of significance to test the null hypothesis 'sigma' = 0.50 against the alternative hypo
Can you perform a multiple regression analysis with the data you have been collecting without changing that data or adding to it? Why or why not? Can you perform a multiple regression analysis with the data you have been collecting and additional data derived from that collection? Why or why not? See attachment for data.