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Category > Computer Science Posted 19 Sep 2017 My Price 9.00

soil water content

Agriculture: Bell Peppers The following data represent soil water content (percent water by volume) for independent random samples of soil taken from two experimental fields growing bell peppers

Soil water content from field I: x1; n1 72

15.1

11.2

10.3

10.8

16.6

8.3

9.1

12.3

9.1

14.3

10.7

16.1

10.2

15.2

8.9

9.5

9.6

11.3

14.0

11.3

15.6

11.2

13.8

9.0

8.4

8.2

12.0

13.9

11.6

16.0

9.6

11.4

8.4

8.0

14.1

10.9

13.2

13.8

14.6

10.2

11.5

13.1

14.7

12.5

10.2

11.8

11.0

12.7

10.3

10.8

11.0

12.6

10.8

9.6

11.5

10.6

11.7

10.1

9.7

9.7

11.2

9.8

10.3

11.9

9.7

11.3

10.4

12.0

11.0

10.7

8.8

11.1

 

 

 

 

 

 

 

 

 

Soil water content from field II: x2; n2 80

12.1

10.2

13.6

8.1

13.5

7.8

11.8

7.7

8.1

9.2

14.1

8.9

13.9

7.5

12.6

7.3

14.9

12.2

7.6

8.9

13.9

8.4

13.4

7.1

12.4

7.6

9.9

26.0

7.3

7.4

14.3

8.4

13.2

7.3

11.3

7.5

9.7

12.3

6.9

7.6

13.8

7.5

13.3

8.0

11.3

6.8

7.4

11.7

11.8

7.7

12.6

7.7

13.2

13.9

10.4

12.8

7.6

10.7

10.7

10.9

12.5

11.3

10.7

13.2

8.9

12.9

7.7

9.7

9.7

11.4

11.9

13.4

9.2

13.4

8.8

11.9

7.1

8.5

14.0

14.2

(a) Use a calculator with mean and standard deviation keys to verify that width=, and s2≈ 3.03.

(b) Let μ1 be the population mean for x1and let μ2be the population mean for x2. Find a 95% confidence interval for μ1- μ2.

(c) Interpretation Explain what the confidence interval means in the context of this problem. Does the interval consist of numbers that are all positive? All negative? of different signs? At the 95% level of confidence, is the population mean soil water content of the first field higher than that of the second field?

(d) Which distribution (standard normal or Student’s t) did you use? Why? Do you need information about the soil water content distributions?

Answers

Maurice Tutor
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Status NEW Posted 19 Sep 2017 09:09 AM My Price 9.00

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