could you help giving me explanation on these problems ? Thank you .

Question 6 Regarding Problem 2. How many degrees of freedom are available for estimating the variance of the error? Not yet answered Points out of 5.0 P Flag question O A 15 O B. 16 O C. 17 O D. 18 Question 7 Not yet Problem 3. To investigate the effect on potato yields of water loss due to transpiration, a horticulturist plans to use shade covers on plots at various stages of their growth and development. Plots will be shaded to answered reduce solar input (to the plants) by 0, 1/3, or 2/3. The three shadings will be applied to each of four different plots for a one-month period during "early" and "late" stages of growth. After the experiment, the Points out of difference between the yields at these two stages will be reported. The plots under consideration are scattered around a large region. 10.0 Which design would you r mmend for this experiment? P Flag question O A Completely randomized design O B. Latin square design O C. Randomize Complete Block Design O D. Factorial design with blocks Question 8 Regarding Problem 3. Let the treatment means for 0, 1/3, or 2/3 be denoted by #1, #2 and ja, respectively. Suggest two sensible contrasts to the experimenter. Not yet answered O A (-2, 1, 1) Points out of 5.0 Flag question O B. (-1, -1, 2) O C. (0, -1, 1) D. (-1, 0, 1) O E. (-1, -1, 0) Question 9 Problem 4. An engineer plans to conduct an experiment on a resistor mounted on a ceramic plate. The goal of the experiment is to assess the impact of four geometrical shapes of the resistor on the current Not yet answered resistor's noise. Four plates are considered for the experiment which were provided by four different suppliers. Only three resistors can be mounted on one plate. Points out of Which design would you recommend for this experiment? 10.0 Flag question O A Latin square design B. Randomize Complete Block Design O C. Balanced Incomplete Block Design O D. Factorial design with blocks Question 10 Regarding Problem 4. The experimenter conducted the experiment using the appropriate design. She computed the ANOVA summary table using the R software and the "aov' function. The incomplete table is Not yet shown below. answered Points out of 5.0 Df Sum Sq Mean Sq F value P Flag question 3 0.35 0.12 8.45 3 0.47 0.16 11.32 Residuals 5 0.07 0.01 What is the observed value of the test statistic for the factor under study? O A. 8.45 O B. 11.32