This paper circulates around the core theme of 1. The strength of five types A, B, C, D and E of fibre-board were being compared. together with its essential aspects. It has been reviewed and purchased by the majority of students thus, this paper is rated 4.8 out of 5 points by the students. In addition to this, the price of this paper commences from £ 99. To get this paper written from the scratch, order this assignment now. 100% confidential, 100% plagiarism-free.
1. The strength of five types A, B, C, D and E of fibre-board were being compared. Four boards of each type were tested. The modulus of rupture of each of the 20 boards is given in the following table:
A B C D E
619 424 392 462 465
674 525 494 559 568
633 549 441 556 613
622 601 457 611 611
a) Use Bartletts test to determine if the within board variances are significantly different (α = 0.05).
b) Perform analysis of variance and draw your conclusions (α = 0.05).
c) Use Bonferronis Multiple Comparison Test, with a 0.05 level of significance, to compare the means. Discuss your results.
d) Calculate 95% confidence limits for the difference of means D and E
2. The following are the yields in kilograms of above-ground biomass per plot that resulted when four levels of nitrogen were applied to young Douglas-fir seedlings.
Treatment N0 N1 N2 N3
4.37 7.50 7.80 9.40
6.72 8.80 7.82 9.28
8.32 8.73 9.62
a) Construct the analysis of variance table (α = 0.05).
b) Calculate 95% confidence limits for the mean of treatment N2.
3. An experiment was set up to test the production of women against the production of men in forest inventory cruising. The data below show the number of plots they put in per day in three different forest types (A, B, C) for four randomly selected working days.