A researcher wished to compare the average daily hotel room rates between San Francisco and Los Angeles. The researcher obtained an SRS of 15 hotels in downtown San Francisco and found the sample mean ? ̅1=$156, with a standard deviation ?_1= $15. The researcher also obtained an independent SRS of 10 hotels in downtown Los Angeles and found the sample mean ? ̅_2= $143, with a standard deviation ?_2= $10. Let 1 and 2 represent the mean cost of the populations of all hotels in these cities, respectively. Assume the two-sample t procedures are safe to use, i.e. Unequal Variances. a)Suppose the researcher had wished to test the hypotheses H0: µ1 = µ2 vs. Ha: µ1 ≠ µ2 at the 5% significance level (i.e., α = 0.05). The numerical value of the two-sample t statistic is? b)What is your P-value? c)What are your statistical conclusion and its interpretation? Use significance level, α = 0.05 (or 5%
. d)Based on your P-value and conclusion in (b) and (c), will you conclude that a 99% confidence interval for µ1 - µ2 includes the value 0? Explain.
In: Statistics and Probability
A long, thin solenoid has 600 turns per meter and radius 2.6 cm.
The
current in the solenoid is increasing at a uniform rate
dI/dt. The induced
electric eld at a point near the center of the solenoid and 3.80 cm
from
its axis is 8.00 10 -5 V/m. Calculate
dI/dt
In: Physics
2. Why is it useful to have mechanisms for direct cell to cell communication and for long distance communication with cells not near each other?
3. Why would bacterial cells need to communicate with each other? What is the advantage? Find an example bacteria that communicate and how do they communicate?
please answer both questions
In: Biology
White light falls in, near the normal direction, against a thin oil film lying on a glass plate. Two colors with wavelengths of 525nm and 650nm clearly dominate the reflected light. Assume that the refractive index of the oil is 1.25 and the refractive index of the glass is 1.5.
Determine the thickness of the film and the order of interference for the dominant colors.
In: Physics
One positive and one negative charges identical in magnitude are place near each other. At halfway between the two charges...
| the electric field is zero and the potential is zero. |
| the electric filed is not zero and the potential is positive. |
| the electric field is not zero and the potential is zero. |
| None of these statements is true. |
| the electric field is not zero and the potential is negative. |
In: Physics
All else equal, firms with higher leverage (D/E ratio) tend to have higher betas. However, when firms are heavily levered (near the “zone of insolvency” or bankruptcy), their betas tend to drop significantly. Without mentioning anything about the equation for beta, briefly explain why this phenomenon might occur.
In: Finance
This is really a business ethics question
Some would say that given the rash of ethical scandals in the last 20 years, that ethical business behavior is waning. Given what you now know about corporate governance, do you think that ethics will be more or less important to business in the near future? In the distant future?
In: Operations Management
Discuss and graphically illustrate supply side economics in the context of a negative temporary supply shocks of the 1970s
In: Economics
I am planning to take Physics next semester. We already received our syllabus and I want to start on my project now.
Design
Construct, and demonstrate
A copper penny can be levitated using any two or more of the following techniques in your design: electrostatics, magnetostatics, and electromagnetics.
All components must be built out of household materials.
In: Physics
In: Economics