Give typing answer with explanation and conclusion Q1. In the simplest type of experiment, only a value of the independent variable is administered to the control group. Select one: True or False
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Give typing answer with explanation and conclusion
Q1. In the simplest type of experiment, only a value of the independent variable is administered to the control group. Select one: True or False
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- Describe the major differences between a randomized controlled experiment and a quasi-experimentResearchers conducted a prospective cohort study to assess the association between dietary supplements and cognitive ability among children. A total of 500 children age 12-17 years who take an omega-3 fatty acid supplement are compared with 500 children age 12-17 years who do not take an omega-3 fatty acid supplement. Researchers follow the children for 2 years. During this time, 300 children who take the supplement earn what is classified as a “high” score on a cognitive test while 200 children who do not take the supplement earn what is classified as a “high” score on the same cognitive test. Show calculations. a) Construct a 2x2 table from the information presented above b) The risk difference is:DISCUSS IF TRUE OR FALSE Heteroscedasticity can be tested by just comparing variances of 2 random splits sets of error terms.
- Q. Which of the following is true of heteroscedasticity? Options- a. Population R-squared is affected by the presence of heteroscedasticity. b. Heteroscedasticity causes inconsistency in the ordinary least squares estimators. c. The ordinary least squares estimators are not the best linear unbiased estimators if heteroscedasticity is present. d. It is not possible to obtain F statistics that are robust to heteroscedasticity of an unknown form.The manager of a men’s clothing catalog measured the market’s response to a $6 decrease in the usual price of his company’s oxford shirts by conducting a sales experiment. An A-B split was used to divide the company’s 120,000-customer mailing list into two groups. Customers in the control group were sent catalogs listing oxford shirts at their usual price of $40. Customers in the test group were sent catalogs listing the price of oxford shirts at $32.80. During the period of the test, customers in the control group purchased 700 oxford shirts, and customers in the test group purchased 889 oxford shirts. What is the independent variable in this sales experiment? What is the dependent variable in this sales experiment? What is the percent change in price in this experiment? What is price elasticity indicated by the results of this experiment.If SLR 1-3 hold, but SLR 4 is violated, then... OLS estimators are unbiased and inconsistent OLS test statistics suffer from heteroskedasticity OLS estimators are biased and consistent OLS estimators are biased and inconsistent
- A tea company appoints four salesmen A, B, C and D and observes their sales in three months, April, May and June: Months Salesmen A B C D April 36 36 21 35 May 28 29 31 32 June 26 28 29 29 Prepare a two – way analysis of variance table Name the blocking variable and the treatment in this experiment. Test at the 5% level of significance the null hypothesis that there is significant difference in sales made by the four salesmen Test at the 5% level of significance the null hypothesis that there is significant difference in the sales made during different months.Suppose employers care about overall productivity Z, which is made up of two components, X and Y, such that Z=X+Y (and employers know this productivity function). Suppose there are two groups (male and female) whose average Zs are the same (i.e. Z_M =Z_F), but X_M < X_F and Y_M > Y_F (and again, employers know these population averages). Researchers decide to run a resume-based audit study where they randomize names based on gender (using typically male or female names) but hold constant Y. They provide no information on X. Which of the following would suggest taste-based discrimination? ● The call-back rate is the same for both sexes. ● The call-back rate is higher for men than for women ● We can't use differences in call-back rates to find suggestive evidence of taste-based discrimination because there's too many other factors that are different across the resumes. ● The call-back rate is higher for women than for menAdvertising testing that studies dilation or constriction of the eye in response to stimuli is called: Multiple Choice A) pupillometrics B) galvanic eye responses C) Flesch testing D) the reactive test.
- Consider the following TSLS model, where Ability is an endogenous independent variable, while Educand Age are exogenous.Stage 1 : Ability = 0 + 1 Educ + 2 Age + 3 Expr + 4 ParEduc + 5 KWW + VStage 2 : log(Wage) = 0 + 1 Educ + 2 Age + 2 Ability + UIf we use the Sargan test, the rst-stage F test and the Hausman test together to decide whether aTSLS or an OLS would be more appropriate, ll in the following blanks: at the 5% signi cance level, the critical value for the Sargan test is blank, and the critical value forthe Hausman test is blank; if we blank (reject or fail to reject) the Sargan test, blank (reject or fail to reject) the rst-stageF test, and blank (reject or fail to reject) the Hausman test, then it is implied that we shall use theTSLS instead of the OLS estimation.Previous answer was absolutely incorruConsider the experiment of a toss of two coins. A: observes one head.B: observes two heads. Find P(A) and P(B). Group of answer choices P(A) = 0.1 and P(B) = 0.2 P(A) = 0.25 and P(B) = 0.25 P(A) = 0.5 and P(B) = 0.25 P(A) = 0.25 and P(B) = 0.5 P(A) = 0.5 and P(B) = 0.5