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In: Statistics and Probability

Plot Fertilizer A Fertilizer B Fertilizer C 1 563 588 575 2 593 624 593 3...

Plot Fertilizer A Fertilizer B Fertilizer C
1 563 588 575
2 593 624 593
3 542 576 564
4 649 672 653
5 565 583 556
6 587 612 590
7 595 617 607
8 429 446 423
9 500 515 483
10 610 641 626
11 524 547 523
12 559 586 568
13 546 582 551
14 503 530 502
15 550 573 567
16 492 518 495
17 497 529 513
18 619 643 626
19 473 497 479
20 533 556 540

g) Assuming population mean of crop yield is 570 bushels for all fertilizers with standard deviation of 40 bushels for all. Formulate a test hypothesis that crop yield by applying fertilizer C differs from the population crop yield for all fertilizers. Conduct the hypothesis test, conclude your analysis and explain your answer. Use both critical value and p-value approach with alpha=0.05

h) Calculate a 90% confidence interval estimate of the difference between the population mean yield of fertilizers B and A. Can we conclude at 0.05 level of significance, that the crop yield using fertilizer B is greater than the crop yield using fertilizer A? (hint: you can use the template in chapter 10 to calculate degrees of freedom and the standard error)

i) If we assume that observations are now plots of lands, can the scientist infer that there are differences between the three types of fertilizers?

* Only need help with question i)

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