Question
In: Statistics and Probability
Samples of both surface soil and subsoil were taken from eight randomly selected agricultural locations in...
Samples of both surface soil and subsoil were taken from eight randomly selected agricultural locations in a particular county. Soil was analyzed to determine both surface PH and subsoil PH, with the results shown in the following table.
At the 5% level of significance, does the data indicate that the mean pH of topsoil is lower than the mean pH of subsoil? Conduct the hypothesis test.
| Location | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| Surface PH | 6.55 | 5.98 | 5.59 | 6.17 | 5.92 | 6.18 | 6.43 | 5.68 |
| Subsoil PH | 6.78 | 6.14 | 5.8 | 5.91 | 6.1 | 6.01 | 6.18 | 5.88 |
Solutions
orchestra answered 1 year agoRelated Solutions
Soil samples from nine locations at a site are taken to determine the bearing capacity in...
Soil samples from nine locations at a site are taken to
determine the bearing capacity in kN/m^2. The results are
summarized:
23.1, 42.4, 30.3, 31.0, 28.4, 39.3, 32.4, 27.4, 38.0
(a) Estimate the mean, standard deviation, and COV of the
data
(b) Compute the standard error of the mean.
(c) Establish 95 percent confidence intervals for the mean.
(d) Using the COV from (a) how many samples must be tested to
have +/- 10 percent error for the mean at...
In a study, soil cores were taken from two locations in a forest: 1) under an...
In a study, soil cores were taken from two locations in a
forest: 1) under an opening in the forest canopy (the "gap"
location); 2) at a nearby area under heavy tree growth (the
"growth" location). The amount of carbon dioxide given off by each
soil core (respiration rate) was measured in mol CO2/g soil/hr. A
scientist is then asked to test whether the gap and growth areas
differ with respect to soil respiration. A preliminary descriptive
statistics check reveals...
Water samples from a certain river in North Carolina were taken at 16 different locations and...
Water samples from a certain river in North Carolina
were taken at 16 different locations and tested for lead. Here are
the data:
sample
lead (mg/L)
1
0.23
2
0.39
3
0.17
4
0.20
5
0.18
6
0.16
7
0.25
8
0.14
9
0.00
10
0.17
11
0.00
12
0.06
13
0.10
14
0.02
15
0.09
16
0.12
If the lead contamination level goal is 0.00 mg/L, what
percentage of these river locations need decontamination
work?
Use technology to make...
Two soil samples fully saturated were collected from the field for testing in the lab, both...
Two soil
samples fully saturated were collected from the field
for testing in the lab, both having a natural void ratio of 0.6.
The composition of the soil particles is as follows:
Sample
1: Composed of ONLY
quartz [3]
Sample
2: Composed of 65% quartz, 23% mica &12% iron
oxide.
[4] The
average value of specific gravity of soil particles is 2.65 for
quartz, 3.0 for mica and
3.8 for iron oxide.
Calculate the total unit weight of soil...
Samples were taken at three different locations in a river to determine whether the quantity of...
Samples were taken at three different locations in a river to
determine whether the quantity of dissolved oxygen, the measure of
water polution, varied from one location to another. The results
are given in the table below.
1
2
3
6.1
6.2
3.9
6.3
6.7
3.5
5.2
6.5
3.9
5.8
6.3
If we were to use ANOVA to analyze this data
what would be the value of SS(treatment)?
Where are the deer? Random samples of square-kilometer plots were taken in different ecological locations of...
Where are the deer? Random samples of square-kilometer plots
were taken in different ecological locations of Mesa Verde National
Park. The deer counts per square kilometer were recorded and are
shown in the following table.
Mountain Brush
Sagebrush Grassland
Pinon Juniper
31
20
8
32
56
3
22
17
6
27
19
5
Shall we reject or accept the claim that there is no difference
in the mean number of deer per square kilometer in these different
ecological locations? Use...
Where are the deer? Random samples of square-kilometer plots were taken in different ecological locations of...
Where are the deer? Random samples of square-kilometer plots
were taken in different ecological locations of a national park.
The deer counts per square kilometer were recorded and are shown in
the following table.
Mountain Brush
Sagebrush Grassland
Pinon Juniper
30
24
10
32
56
7
22
14
6
34
17
7
Shall we reject or accept the claim that there is no difference
in the mean number of deer per square kilometer in these different
ecological locations? Use a...
Samples of computers are taken from two county library locations and the number of internet tracking...
Samples of computers are taken from two county library locations
and the number of internet tracking spyware programs is counted.
The first location hosted 21 computers with a mean of 4.1 tracking
programs and a standard deviation of 0.8. The second location
hosted 19 computers with a mean of 6.2 tracking programs and a
standard deviation of 1.2.
a) Please calculate the appropriate standard error statistic for
the scenario provided.
b)Please calculate a confidence interval around your point
estimates as...
Samples of computers are taken from two county library locations and the number of internet tracking...
Samples of computers are taken from two county library locations
and the number of internet tracking spyware programs is counted.
The first location hosted 21 computers with a mean of 4.1 tracking
programs and a standard deviation of 0.8. The second location
hosted 19 computers with a mean of 6.2 tracking programs and a
standard deviation of 1.2.
a) Please calculate the appropriate standard error statistic for
the scenario provided.
b)Please calculate a confidence interval around your point
estimates as...
Independent random samples of 180 observations were randomly selected from binomial populations 1 and 2, respectively....
Independent random samples of 180 observations were randomly
selected from binomial populations 1 and 2, respectively. Sample 1
had 104 successes, and sample 2 had 113 successes.
Suppose that, for practical reasons, you know that
p1
cannot be larger than
p2.
Test the appropriate hypothesis using α = 0.10.
vH0: (p1 − p2) = 0 versus
Ha: (p1 − p2) < 0
Find the test statistic. (Round your answer to two decimal
places.)
z =
Find the rejection region. (Round...
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