For y = number of times used public transportation in previous week and x = number of cars in family (which takes value 0, 1, or 2 for the given sample), explain the difference between conducting a test of independence of the variables using the ANOVA F test for comparing three means and using a regression t test for the coefficient of the number of cars in an ordinary regression model with a linear effect for the number of cars (e.g. treating number of cars as a numeric variable). Give an example of three population means for which the regression test would be less appropriate than the ANOVA test. (Hint: What does the regression linear model with numeric number of cars assume that the ANOVA F test does not?). Need a detailed reasoning.
For y = number of times used public transportation in previous week and x = number...
For y = number of times used public transportation in previous week and x = number of cars in family (which takes value 0, 1, or 2 for the given sample), explain the difference between conducting a test of independence of the variables using the ANOVA F test for comparing three means and using a regression t test for the coefficient of the number of cars in an ordinary regression model with a linear effect for the number of cars...
Match the study with the best hypothesis test that could be used to evaluate the research question.Do exercise supplements improve the effect of training among amateur runners? 112 amateur runners were enrolled in a study in which they ran using a proven 12-week 5km race training plan. At the beginning of the 12-week study, they ran a 5km race, their finishing times were recording; they repeated the same race at the end of the 12-week study. Half of the enrolled...
While conducting a one-way ANOVA comparing 6 treatments with 10 observations per treatment, the computed value for SS(Treatment)= 1, and SS(Error)=24. Calculate the value of F. Round off the answer to 2 decimal digits A study was conducted to determine the association between the maximum distance at which a highway sign can be read ( in feet) and the age of the driver ( in years). Fourty drivers of various ages were studied. The summary statistics for distance and age are...
1. In order to test whether the multiple linear regression model y bo +b,x1 + b2X2 is better than the average model (lazy model), which of the following null hypotheses is correct: a. Ho' b1 = b2 = 0 Но: B1 B2-0 с. We have a dataset Company with three variables: Sales, employees and stores. To build a multiple linear regression model using Sales as dependent variable, number of stores and number of employees as independent variables, which of the...
(1 point) Family transportation costs are usually higher than most people believe. Eighteen randomly selected families in three major cities are asked to use their records to estimate a monthly figure for transportation cost. Use the data obtained and ANOVA to test whether there is a significant difference in monthly transportation costs for families living in these cities. Use a = 0.05. Edmonton 650 480 550 600 675 540 TE Toronto Vancouver 250 850 525 700 950 175 780 500...
Question 10 Background: Name That Scenario: Pet Adoption One important aspect in statistics is to understand which statistical methods or procedures are appropriate to use to address the research problem or question of interest. For each description of a research question below, select the one corresponding statistical analysis technique most appropriate for addressing that research question. An employee who has just been put in charge of the pet adoption fundraiser thinks that a personal phone cal to recent adopters asking...
2. This week, we studied the test score Y versus number of hours, X, spent on test preparation, of a student in a French class of 10 students with the collected results shown below Number of hours studied Test score 31 10 14 73 37 12 60 91 21 84 17 (a) Use linear normal regression analysis method or the least-squares approximation method to predict the average test score of a student who studied 12 hours for the test (b)...
The Book of R (Question 20.2) Please answer using R code. Continue using the survey data frame from the package MASS for the next few exercises. The survey data set has a variable named Exer , a factor with k = 3 levels describing the amount of physical exercise time each student gets: none, some, or frequent. Obtain a count of the number of students in each category and produce side-by-side boxplots of student height split by exercise. Assuming independence...
1. Suppose you were asked to analyze each of the situations described below. (NOTE: Do not answer these problems!) For each, indicate which procedure you would use (pick the appropriate number from the list), the test statistic (z.2 or ), and the number of degrees of freedom A procedure may be used more than once. 1. difference of proportions test Type zx/t? df 2. difference of means test a. 3. paired means test 4. goodness of fit test 5. homogeneity/independence...