An experiment in which 44.00kJ of heat is added to a cube of metal with initial side length 1.00m and temperature 300.K is performed twice, once with a copper cube and once with a lead cube. Fill in the blanks with "<", ">", "=", "N/A". Select N/A only if a comparison is not possible.
The copper cube's initial volume is the lead
cube's.
The copper cube's initial temperature is the lead
cube's.
The copper cube's final temperature is the lead
cube's.
The copper cube's final volume is the lead cube's.
The copper cube's final mass is the lead cube's.
The copper cube's final internal energy is the lead
cube's.
In: Physics
The photogates in the experiment are used to determine the speed of the gliders passing through. The photogates measure the time it takes for the photogate beam to go from being unblocked to blocked to unblocked again. You tell the photogate how long your glider is, and the speed is then calculated.
Given the description of what the photogates do, how will you determine the velocity of the glider?
In: Physics
An experiment was carried out to study the effect of the percentage of ammonium (Factor A) and the stir rate (Factor B) on the density of the powder produced. The results are in the accompanying table. Complete parts (a) through (e).
At the 0.01 level of significance is there an interaction between the percentage of ammonium and the stir rate?
- Stir_Rate -
Percent_of_Ammonium 100 150
2% 10.83 8.49
2% 14.64 6.84
2% 18.46 9.05
2% 15.86 9.54
30% 12.29 12.97
30% 15.66 15.62
30% 18.26 15.62
30% 15.77 13.81
A.) Determine the value of the test statistic.
FSTAT=
(Round to two decimal places as needed.)
PValue=
B.) at the .01 level of significance, is there an effect due to the percentage of ammonium?
FSTAT=
PValue=
In: Statistics and Probability
An experiment was conducted to test the effect of a new drug on a viral infection. After the infection was induced in 100 mice, the mice were randomly split into two groups of 50. The first group, the control group, received no treatment for the infection, and the second group received the drug. After a 30-day period, the proportions of survivors, p̂1 and p̂2, in the two groups were found to be 0.4 and 0.60, respectively.
Find the test statistic and rejection region. (Round your answers to two decimal places. If the test is one-tailed, enter NONE for the unused region.
z = ?? (please do not use (p1-p2) / SE as it does not work. I have tried this multiple times)
z < = -1.65
z > = NONE
(b) Use a 95% confidence interval to estimate the actual difference (p1 − p2) in the survival rates for the treated versus the control groups. (Round your answers to two decimal places.)
In: Statistics and Probability
In a single slit experiment, the central maximum is:
|
The same size as all of the other maximums. |
|
|
Twice the size of the other maximums. |
|
|
Half the size of the other maximums. |
|
|
Just slightly larger than the other maximums. |
Electrons would be ejected from silver if the incident light had a frequency of:
|
1.03 x 1015 Hz |
|
|
1.02 x 1015 Hz |
|
|
1.01 x 1015 Hz |
|
|
None of the options is correct |
What is the mass equivalent of an x-ray with a frequency of 5.63 x 1017 Hz?
|
4.14 x 10-33 kg |
|
|
2.59 x 10-14 kg |
|
|
1.24 x 10-24 kg |
|
|
None of the options is correct. |
In: Physics
An experiment was conducted to determine the effect of a high salt mean on the systolic blood pressure (SBP) of subjects. Blood pressure was determined in 12 subjects before and after ingestion of a test meal containing 10.0 gms of salt. The data obtained were:
|
Subject |
SBP before meal |
SBP after meal |
|
1 |
120 |
147 |
|
2 |
130 |
140 |
|
3 |
139 |
148 |
|
4 |
120 |
115 |
|
5 |
123 |
122 |
|
6 |
140 |
157 |
|
7 |
131 |
144 |
|
8 |
123 |
134 |
|
9 |
125 |
140 |
|
10 |
130 |
165 |
|
11 |
131 |
133 |
|
12 |
142 |
153 |
In: Statistics and Probability
In this week's experiment, the heat of vaporization of liquid
nitrogen is determined by measuring the change in temperature of a
known sample of warm water when liquid nitrogen is added.
In one experiment, the mass of water is 104 grams,
the initial temperature of the water is
69.3oC, the mass of liquid nitrogen
added to the water is 60.6 grams, and the final
temperature of the water, after the liquid nitrogen has vaporized,
is 41.3oC.
Specific heat of water = 4.184 J K-1g-1
How much heat is lost by the warm water?
Heat lost = J
What is the heat of vaporization of nitrogen in J
g-1?
Heat of vaporization
= J
g-1
What is the molar heat of vaporization of nitrogen?
Molar heat of vaporization
=
J mol-1
Trouton's constant is the ratio of the enthalpy (heat) of
vaporization of a substance to its boiling point (in K). The
constant is actually equal to the entropy change for the
vaporization process and is most often a measure of the entropy in
the liquid state. The value of the constant usually lies within the
range 70 to 90 J K-1mol-1, with a value
toward the lower end indicating high entropy in the liquid
state.
The normal boiling point of liquid nitrogen is -196oC.
Based upon your results above, what is the value of Trouton's
constant?
Trouton's constant
= J
K-1mol-1
In: Chemistry
Consider the experiment of rolling two dice and the following events:
A: 'The sum of the dice is 8' and B: 'The first die is an odd number' and C: "The difference (absolute value) of the dice is 2"
Find (a) p(A and B) (HINT: You cannot assume these are independent events.)
(b) p(A or B)
(c) Are A and B mutually exclusive events? Explain.
(d) Are A and B independent events? Explain.
(e) Are B and C independent events? Explain.
In: Statistics and Probability
. A new vaccination is being used in a laboratory experiment to investigate whether it is effective. There are 252 subjects in the study. Is there sufficient evidence to determine if vaccination and disease status are related?
Vaccination Status Diseased Not Diseased Total
Vaccinated 51) 54) 105)
Not Vaccinated 54) 73) 147)
Total (125) (127) ( 252)
State the null and alternative hypothesis.
Find the value of the test statistic. Round your answer to three decimal places.
Find the degrees of freedom associated with the test statistic for this problem.
Find the critical value of the test at the 0.01 level of significance. Round your answer to three decimal places.
Make the decision to reject or fail to reject the null hypothesis at the 0.01 level of significance.
State the conclusion of the hypothesis test at the 0.01 level of significance.
In: Statistics and Probability
Here is the data for our experiment.
The data are the SMUT scores of the students in each group. Notice that we have a different number (n) for the lecture group. This is to show you that we can have uneven sets of data for ANOVA. Note: If we were doing a real study, we would have larger n’s. Enter the data into the Excel spread sheet, SPSS or your calculator
| Independent Variable | Data |
| Computer (n1= 8) | 85, 87, 91, 78, 90, 83, 86, 89 |
| Lecture (n2= 7) | 79, 76, 75, 79, 75, 72, 81, |
| Cooperative (n3= 8) | 80, 99, 87, 84, 83, 77, 76, 80 |
This assignment is part of my ANOVA Exercise, I will please need help in completing it.
Thanks
In: Statistics and Probability