Estimates of the reproductive rate RO for SARS-CoV-2 vary, but are typically in the range of 2.5-4. Assuming RO = 3, what proportion of the population must be vaccinated (or otherwise immune) to achieve herd immunity? Select the best answer. O 0.33
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- For the situation described below, state the null and alternative hypotheses to be tested. (Enter != for ≠ as needed.) A seed wash is expected to change the proportion p of seeds that germinate when planted in poorly-draining soil. Suppose that the current germination rate is about 70%.Given data below where x=neckline and y=waistline n=15 Answer the following: a. Standard Error of estimate b. If the neckline is 47 cm, estimate the waistline (in cm) using the regression model.For exponential smoothing forecasting with an alpha of 0.1, the MSE (mean squared error) is 2.98. Using an alpha of 0.05, the MSE is 1.32. Using the MSE, which value of alpha provides the best estimate? 1.) alpha = 0.1 2.) alpha = 0.05
- While rejecting H0 on a hypothesis test means that _______, measures of effect size tell you ______. how big an effect the treatment has; that the treatment has some effect that the treatment has some effect; how big an effect the treatment has that the treatment caused an increase; that the treatment caused a decrease d. that the treatment caused a decrease; that the treatment caused an increaseA regression of average monthly expenditure (AME, measured in euros) on average monthly income (AMI, measured in euros) using a random sample of college-educated full-time workers earnings €100 to €1.5 million yields the following: AME = 710.7 + 8.8 × AMI, R2 = 0.030, SER = 540.30 d. What does the regression predict will be the expenditure of a person with an income of €100? With an income of €200? e. Will the regression give reliable predictions for a person with an income of €2 million? Why or why not? ( f. Given what you know about the distribution of earnings, do you think it is plausible that the distribution of errors in the regression is normal? (Hint: Do you think that the distribution is symmetric or skewed? What is the smallest value of earnings, and is it consistent with a normal distribution?).A professor obtains SAT scores and freshman grade point averages (GPA) for a group of n=15 college students. The SAT scores have a mean of M=580 with SS=22,400, and GPA has a mean of 3.10 with SS=1.26, and SP=84.c. Does the regression equation account for a significant portion of the variance in GPA? Use ?=.05α=.05 to evaluate the F-ratio.
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- Given the values in the table in the image attached, how do I find the value of r^2? Does the value suggest that the model is a good, somewhat good, or bad fit? About what percent of the total variation in y can be explained by the model? What percent is unexplained?A researcher conducted a number of descriptive statistics for two variables X and Y. They were as follows: SP = -20; SSx = 4; My = 7; Mx = 3 What is b equal to? What is a equal to? Using b and a construct a regression equation, and then using the regression equation, calculate the value of predicted Y when X = 2?Given are five observations collected in a regression study on two variables. a. Which of the following scatter diagrams accurately represents the data? B (NEED ANSWERS FOR B and C) b. Develop the estimated regression equation for these data (to 1 decimal). c. Use the estimated regression equation to predict the value of Y when X=6 (1 decimal)
