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In: Math
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 appropriate for the scenario. Use a confidence limit of 99% (.01)
c) Please calculate a confidence interval around your point estimates as appropriate for the scenario. Use a confidence limit of 95%.
d) How do your confidence intervals compare? Is this what you expected to see? Why?
Solutions
milcah answered 1 year agoRelated Solutions
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...
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...
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...
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...
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)?
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...
Two random samples are taken, one from among UVA students and the other from...
Two random samples are taken, one from among UVA students and the other from among UNC students. Both groups are asked if academics are their top priority. A summary of the sample sizes and proportions of each group answering yes" are given below: UVA (Pop. 1): n1 = 89,\(\hat{p}_{1}\)
= 0.81 UNC (Pop. 2): n2 = 86,\(\hat{p}_{2}\) = 0.561 Find a 97.3% confidence interval for the difference P1 – P2 of the population proportions. Confidence interval = _______
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...
A county library in Minnesota reported the following number of books checked out in 15 randomly...
A county library in Minnesota reported the following number of
books checked out in 15 randomly selected months:
5,176 6,005 5,052 5,310 4,188 4,132 5,736 5,381 4,983 4,423 5,002
4,573 4,209 5,611 4,568
Determine the range, variance, and standard deviation for the
sample data.
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