Generate a quadratic model with y=x+x^2+e. x and e are both vectors which are normal mean 0, variance 1. Generate a monte-carlo sample from this model with length m = 20. Use the functions train_test_split() to get training and test sets where the test set is 1/2 of the full sample size, m. Fit three different models, a linear model, a quadratic model, and a 7 degree polynomial.

Astudent simplified a rational expression as shown.

1. there are 25 students who started computer programming in elementary school and 25 students who started computer programming in middle school. the first group had a mean final project grade of 95% and the second group had a mean final project grade of 92%. the line plot shows the differences after 10 rerandomizations. determine whether the difference in the means of the two groups is significant based on the line plot. explain your answer.

Carmen ayer en el mercado compro 3/4 kg de guayabas, 6/8 kg de peras, 1/2 kg de naranjas ¿cuantos kilogramos de fruta compro?