Determine the magnitude of polarization (in C/m2) in a material if it is stressed 4.72 GPa perpendicular to the poling axis. (Answer format X.XXX)
d3,1 = 187 x 10-12 m/V
d3,3 = 219 x 10-12 m/V
In: Electrical Engineering
E=1/2 CV^2 E= 1/2 (164 microF) (10^-6 F) (119 V)^2 E= 1.168 J How do you figure out the J from the F V^2
In: Physics
Calculate the EMF of the cell:
Al(s) | Al3+ (0.02 M) || Au+ (0.01 M) | Au(s)
Where Al3+ + 3e- Al E o= -1.66 V
Where Au+ + e- Au E o = +0.99 V
In: Chemistry
1-A) Identify the P-VALUE in a hypothesis test of the following
claim and sample data:
Claim: “The average weekly number of hours spent studying by
students who sit in the front of the classroom is greater than that
of students who sit in the back of the classroom.”
Dozens of randomly selected students were asked how many hours they
study per week. There were 35 students who said that they tend to
sit toward the front of the classroom, and their reported number of
study hours per week had a mean of 17.26 and standard deviation of
9.34. There were 36 students who said they tend to sit toward the
back of the classroom, and they had a mean of 11.08 and standard
deviation of 8.64. The standard deviation for the population of
students who sit in the front is assumed to be the same as that for
those who sit in the back. Test the claim at the 0.01 significance
level.
| a. | 5.664×10-13 | b. | 0.0026 |
|---|---|---|---|
| c. | 4.155×10-21 | d. | 0.0025 |
B)
Identify the value of the CRITICAL VALUE(S) used in a hypothesis
test of the following claim and sample data:
Claim: “The average weekly number of hours spent studying by
students who sit in the front of the classroom is greater than that
of students who sit in the back of the classroom.”
Dozens of randomly selected students were asked how many hours they
study per week. There were 35 students who said that they tend to
sit toward the front of the classroom, and their reported number of
study hours per week had a mean of 17.26 and standard deviation of
9.34. There were 36 students who said they tend to sit toward the
back of the classroom, and they had a mean of 11.08 and standard
deviation of 8.64. The standard deviation for the population of
students who sit in the front is assumed to be the same as that for
those who sit in the back. Test the claim at the 0.01 significance
level.
| a. | 2.33 | b. | 2.382 |
|---|---|---|---|
| c. | 2.441 | d. | 2.438 |
C)
Claim: “The average weekly number of hours spent studying by
students who sit in the front of the classroom is greater than that
of students who sit in the back of the classroom.”
Dozens of randomly selected students were asked how many hours they
study per week. There were 35 students who said that they tend to
sit toward the front of the classroom, and their reported number of
study hours per week had a mean of 17.26 and standard deviation of
9.34. There were 36 students who said they tend to sit toward the
back of the classroom, and they had a mean of 11.08 and standard
deviation of 8.64. The standard deviation for the population of
students who sit in the front is assumed to be the same as that for
those who sit in the back. Test the claim at the 0.01 significance
level.
| a. | 2.895 | b. | 13.281 |
|---|---|---|---|
| c. | 2.892 | d. | 10.933 |
D)
Claim: “The average weekly number of hours spent studying by
students who sit in the front of the classroom is greater than that
of students who sit in the back of the classroom.”
Dozens of randomly selected students were asked how many hours they
study per week. There were 35 students who said that they tend to
sit toward the front of the classroom, and their reported number of
study hours per week had a mean of 17.26 and standard deviation of
9.34. There were 36 students who said they tend to sit toward the
back of the classroom, and they had a mean of 11.08 and standard
deviation of 8.64. The standard deviation for the population of
students who sit in the front is assumed to be the same as that for
those who sit in the back. Test the claim at the 0.01 significance
level.
| a. | 2.895 | b. | 13.281 |
|---|---|---|---|
| c. | 2.892 | d. |
10.933 please solve it all |
In: Statistics and Probability
QUESTION 17
A study finds that the proportion of high school students that use marijuana regularly is from 0.05 - 0.11. Confidence level - 95%. Which of the following statements is FALSE?
It is reasonable to say that more than 7% of high school students use marijuana regularly.
It is reasonable to say that no more than 10% of high school students use marijuana regularly.
The hypothesis that 7% of high school students use marijuana regularly cannot be rejected.
The hypothesis that 15% of high school students use marijuana regularly can be rejected.
In: Statistics and Probability
52. According to the High School Athletics Participation Survey, approximately 55% of students enrolled in high schools participate in athletic programs. You are preforming a study of high school students and would like at least 11 students in the study participating in athletics.
a. How many high school students do you expect to have to randomly select?
b. How many high school students do you have to select to have a 99% probability that the sample contains at least 12 who participate in athletics?
In: Statistics and Probability
A simple random sample of 70 Stat 20 students is taken from my class of 340 students; the average number of units these students is taking is 16.1, with an SD of 1.9. Last spring I taught a smaller class with only 96 students, and those 96 students took an average number of units of 15.5, with an SD of 2.2. Do a hypothesis test to decide whether the average number of units for this semester's Stat 20 class is different than the average number of units for my class last spring.
In: Statistics and Probability
QUESTION: 80% of the Quant 2600 students pass the class. Assume that ten students are registered for the course.
a. What probability distribution works best for this problem? Binomial, Poisson, Hypergeometric, or Normal
b. What is the expected number of students that will pass the
course? (2 decimal places) c. What is the standard deviation of
students that will pass the course? (2 decimal places) d. What is
the probability that exactly 8 will pass the course? (4 decimal
places)
e. What is the probability that at least 8 students will pass the
course? (4 decimal places)
In: Statistics and Probability
QUESTION: 80% of the Quant 2600 students pass the class. Assume that ten students are registered for the course.
a. What probability distribution works best for this problem? Binomial, Poisson, Hypergeometric, or Normal
b. What is the expected number of students that will pass the
course? (2 decimal places) c. What is the standard deviation of
students that will pass the course? (2 decimal places) d. What is
the probability that exactly 8 will pass the course? (4 decimal
places)
e. What is the probability that at least 8 students will pass the
course? (4 decimal places)
In: Statistics and Probability
We interviewed 1,000 QC students. On average they pay about $300 per semester to buy books and school materials, and they vary by $100.
1. Jason spent $400. How many students paid more than Jason?
2. Mary paid $200. How many paid less than her?
3. how many students paid an amount between Mary and Jason?
4. What is the price students are willing to pay, for the highest 10% ?
5. What is the price students are willing to pay, for the lowest 25% ?
In: Statistics and Probability