|
Distance from the Polarograph, m |
1.4 |
3.8 |
7.5 |
10.2 |
11.7 |
15.0 |
|
Mercury concentration, ng g-1 |
2.4 |
2.5 |
1.3 |
1.3 |
0.7 |
1.2 |
Examine the possibility that the mercury arose from the polarograph.
In: Statistics and Probability
To compute a student's Grade Point Average (GPA) for a term, the
student's grades for each course are weighted by the number of
credits for the course. Suppose a student had these grades:
3.8 in a 5 credit Math course
1.9 in a 3 credit Music course
2.8 in a 5 credit Chemistry course
3.4 in a 5 credit Journalism course
What is the student's GPA for that term? Round to two decimal
places.
Student's GPA =
In: Statistics and Probability
You are a researcher testing whether SAT scores predict overall college GPA. Conduct a linear regression analysis with this data by hand. How do your interpret your findings?
|
SAT |
GPA |
|
670 |
1.2 |
|
720 |
1.8 |
|
750 |
2.3 |
|
845 |
1.9 |
|
960 |
3.0 |
|
1000 |
3.3 |
|
1180 |
3.2 |
|
1200 |
3.4 |
|
1370 |
2.9 |
|
1450 |
3.8 |
|
1580 |
4.0 |
|
1600 |
3.9 |
In: Statistics and Probability
Sample grade point averages for ten male students and ten female students are listed. Find the coefficient of variation for each of the two data sets. Then compare the results
Males 2.5 3.8 3.6 3.9 2.6 2.6 3.6 3.2 3.9 1.8
Females 2.8 3.5 2.1 3.7 3.5 4.1 2.1 3.9 3.9 2.3
The coefficient of variation for males is __%.
The Coefficient of variation for females Is __ %
In: Statistics and Probability
Dental Anxiety Study: Study of adults who completed the Dental
Anxiety Scale scored from 0
(no anxiety) to 25 (extreme anxiety). The Summary statistics for
the scores of 20 adults who
completed the questionnaire are x̅= 11.9 and s = 3.8
Conduct a test of Hypothesis to determine whether the mean anxiety
scale score for the
population of College students differs from μ = 14. Use p-value
In: Statistics and Probability
The weight of male babies less than 2 months old in the United States is normally distributed with mean 12.3 pounds and standard deviation 3.8 pounds.
(a) Find the 84 th percentile of the baby weights.
(b) Find the 11 th percentile of the baby weights.
(c) Find the third quartile of the baby weights.
Use the TI-84 Plus calculator and round the answers to at least two decimal places.
In: Statistics and Probability
Listed below are student evaluation ratings of courses, where a rating of 5 is for "excellent." The ratings were obtained at one university in a state. Construct a confidence interval using a 95% confidence level. What does the confidence interval tell about the population of all college students in the state? 4.0, 3.0, 4.0, 4.8, 3.1, 4.5, 3.3, 4.9, 4.5, 4.4, 4.3, 3.8, 3.4, 4.0, 3.9
In: Statistics and Probability
A pure, low molecular weight hydrocarbon gas is burnt in a furnace giving a flue gas containing
10.8% CO 2 , 3.8% O 2 and the remainder nitrogen. Calculate the atomic ratio, H/C, and from this
the formula of the fuel. Note that this analysis is on a dry basis.
2nd part:
Calculate the analysis of the flue gases resulting from the combustion of ethane with 100%
excess air. Give the results on a dry basis.
In: Chemistry
The following table is protein concentration in three groups of trypsin secretion.
|
<=50 |
51-1000 |
>1000 |
|
1.7 |
1.4 |
2.9 |
|
2 |
2.4 |
3.8 |
|
2 |
2.4 |
4.4 |
|
2.2 |
3.3 |
4.7 |
|
4 |
4.4 |
5 |
|
5 |
4.7 |
5.6 |
|
6.7 |
6.7 |
7.4 |
|
7.8 |
7.6 |
9.4 |
|
4 |
9.5 |
10.3 |
Perform ANOVA test BY HAND to test if there is a significant difference among these groups
In: Math
You purchased a bond at a price of $2,100. In 30 years when the bond matures, the bond will be worth $15,000. It is exactly 22 years after you purchased the bond and you can sell the bond today for $11,100. If you hold the bond until it matures, what annual rate of return will you earn from today?
7.9 percent
6.8 percent
3.5 percent
4.3 percent
3.8 percent
In: Finance