Which variables is/are included in the best set of the model using forward selection? a. x1 b. x2 c. x3
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30. Which variables is/are included in the best set of the model using forward selection?
a. x1
b. x2
c. x3
d. none
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- The data set Pain contains hypothetical data for a clinical trial of a drug therapy to control pain. The clinical trial investigates whether adverse responses increase with larger drug doses. Subjects receive either a placebo or one of four drug doses (1, 2, 3, or 4 units). An adverse response is recorded as Adverse = 'Yes'; otherwise, it is recorded as Adverse = 'No'. The number of subjects for each drug dose and response combination is contained in the variable Count. (a) Construct a contingency table that corresponds to the data set created above. What type of variable is Dose? (B) Compute the sample proportions of adverse responses at each dose level. Do you observe any trend in the proportion of adverse responses with respect to dose level? (C) Conduct a Cochran-Armitage trend test at the 5% significance level to address the interests of the trial.A report just came out that stated that 21.3% of all Americans say that vanilla is their favorite ice cream, 23.1% say that chocolate is their favorite, 9.1% favor butter pecan, 10% favor strawberry, and the rest have other favorites. An ice cream shop owner thinks that her customers are not like the rest of America. The table below shows the results of 905 of her patrons' ice cream selections. What can be concluded at the a = 0.05 significance level? a. Complete the table by filling in the expected frequencies. Round your answers to the nearest whole number. Frequencies of Favorite Ice Cream Frequency Expected Frequency Outcome Vanilla 172 Chocolate 195 Butter Pecan 75 Strawberry 86 Other 377 b. What is the correct statistical test to use? Select an answer c. What are the null and alternative hypotheses? Но: Favorite ice cream and where the ice cream is purchased are independent. Favorite ice cream and where the ice cream is purchased are dependent. The distribution of favorite ice…A psychologist wants to test the influence of color on object recognition in 4-year olds. She recruits 25 children and shows them two sets of pictures of everyday objects (variable = picture type), has the children name them, and measures the time it takes (variable = reaction time). She shows the children a color set of pictures first and then shows them a black and white set of pictures. a) What is the independent variable? b) What is the dependent variable? c) What is the second independent variable? d) What is the second dependent variable? e) Is "picture type" a within-subjects or between-subjects variable? f) What scale of measurement is reaction time? g) What scale of measurement is picture type? h) The order of presentation of the picture sets is what kind of variable?
- 2.1 Sales personnel want to further develop the model to include other variables. Merchandise Sales ($10,000s) Tickets Sold (1000s) Win or Loss (W or L) Event includes fan giveaway (Y or N) 15 54 W N 17 67 L Y 10 53 L Y 9 49 W Y 16 59 W N 14 58 L Y 12 56 W N 19 63 W Y 18 65 L Y 17 61 L Y Should you keep either or both of the variables in the model and why? What is the regression equation (only include variables that should be in the model)? What is the merchandise sales forecast for 58,000 tickets sold at a winning event that does not include a fan giveaway?The following table was generated from the sample data of 1010 junior high students regarding the average number of hours they are unsupervised per night, the average number of hours they play video games per night, and their final grades in their math class. The dependent variable is the final grade, the first independent variable (x1x1) is the number of hours unsupervised each night, and the second independent variable (x2x2) is the number of hours of video games each night. Coefficients Standard Error t-Stat p-value Intercept 57.968435 7.227955 8.020032 0.000201 Hours Unsupervised 5.131630 1.314283 3.904510 0.007943 Hours Playing Video Games 1.067855 1.615039 0.661194 0.533040 Indicate if any of the independent variables could be eliminated at theA recent survey of wheat growers focused on the characteristics of wheat farmers and their willingness to participate in agricultural research. One of the variables of interest in the survey was the age of the farmer. The following bar chart shows the responses of the farmers, classified by age-group, regarding their willingness to participate. Which of the following statements is supported by the bar chart? I am choosing betwwen a positive association between the age of the farmers and their willingness to participate and a negative association between the age of the farms and their willingness to participate. I think it is a negative association because if we are talking about willingness the that mean they would say yes to participation, which means that the slope would be negative, but I am unsure.
- Grade points are assigned such that an A receives 4 points, a B receives 3 points, a C receives 2 points, a D receives 1 point, and a F receives 0 points. Grades are weighted according to credit hours (units). If a student receives an A in a four-unit class, a D in a two-unit class, a B in a three-unit class and a C in a three-unit class, what is the student's grade point average? O A. 2.75 O B. 1.75 O C. 3.00 O D. 2.50 Click to select your answer. DELL XXX EVD disc RW DELLDetermine whether the scatterplot shows little or no association, a negative association, a linear association, a moderately strong association, or a very strong association (multiple associations are possible). A. Negative association, linear association, very strong association B. Negative association, linear association C. Linear association, moderately strong association D. Negative association, moderately strong association E. Linear association, very strong associationDetermine whether each situation/question would best be determined by an experiment or a survey/study. 1. [ Select ] Andre wants to estimate the percentage of teenagers who wear glasses v. the percentage that are supposed to wear them and don't. He randomly selects 50 students from his school. 2. [ Select ] Lorain wants to know if eating a small serving of dark chocolate before taking a test has any effect on the grade earned for that test. She randomly assigns students to either have 1 serving of dark chocolate or no chocolate before taking the same test. 3. [ Select ] Ar erson wants to de the most common "favorite color" at his school. 4. [ Select ] Shara wants to determine the color that catches peoples' eye the most when combined with a variety of other colors.
- The following graph is an interaction plot between factors A and B in a 2* factorial experiment. B+ 60 50 B- 40 B+ 30 20 10 B- Factor A There is a weak interaction between factors A and B Select one: O True O False ResponseA random sample of 136 adults were asked to report the number of hours per week the spent on a computer and their number of years of education. The linear model equation below describes the relationship between the mean computers hours and years of education. computers == 9.12 ++ 0.8 ×× education Based on this linear model, which of the following statements is correct? a) An adult who has no years of education is expected to spend 9.12 hours per week on a computer. b) An adult who has 1 more year of education than another is expected to spend 9.12 more hours per week on a computer. c) An adult who spends 1 more hour per week on a computer than another is expected to have had 9.12 more years of education. d) An adult who spend zero hours per week on a computer is expected to have 9.12 years of education.+ 100% For #6-8 refer to the two-way table below. Like Do Not Like Totals Skateboards Skateboards Like 80 25 105 Snowmobiles Do not like 45 10 55 Snowmobiles Totals 125 35 160 but does not like skateboards? 6.) What percentage of this population likes snowm В.) 23.8% C.) 64.0% D.) 71.4% A.) 15.6% 7.) What percentage of this population does not like snowmobiles? В.) 18.2% С.) 28.6% D.) 34.4% A.) 6.3% 8.) What percentage of the people who do not like skateboards in this population do like snowmobiles? B.) 25.0% C.) 71.4% D.) 78.1% A.) 23.8%
