Reference no: EM131468816
Practice Problems (Estimation)
1. Theodore is the owner of FlightPro (an app that provides maps and real-time weather reports for pilots) and is not satisfied with the map download speeds on electronic devices (μ = 90 seconds, σ = 30 seconds, normally distributed). So, he hires a software developer to reprogram the map feature in FlightPro with the hope that map download speeds will decrease to at least an average of 60 seconds. After the software update, Theodore takes a sample of 9 electronic devices to see how long a map of the Las Vegas airspace takes to download.
After the software update, you do not know the new population mean of FlightPro map download speeds on electronic devices, but you do know that the standard deviation after the software update remained 30 seconds.
a. Based on a mean download speed from 9 electronic devices being 60 seconds after the software update, what is the 90% confidence interval for the new average download speed of maps in FlightPro? Explain your results. Is the population mean before the software update captured within the confidence interval?
b. Based on a mean download speed from 9 electronic devices being 60 seconds after the software update, what is the 95% confidence interval for the new average download speed of maps in FlightPro? Explain your results. Is the population mean before the software update captured within the confidence interval?
c. Based on a mean download speed from 9 electronic devices being 60 seconds after the software update, what is the 99% confidence interval for the new average download speed of maps in FlightPro? Explain your results. Is the population mean before the software update captured within the confidence interval?
|
Calculate supervalues free cash flows for next five years
: Calculate Supervalue's free cash flows for the next five years? You may provide your answer using the attached template
|
|
How does american culture define beauty for men and women
: How does American Culture define "beauty" for men and women?What are some typical "beauty" ideas about men and women within your community?
|
|
Recommend that the firm invest in the new system
: Calculate the p-value and explain how to use it for testing the null hypothesis. Would you recommend that the firm invest in the new system?
|
|
The area of proposed research that may pose ethical concerns
: Post the areas of your proposed research that may pose ethical concerns, your plan for dealing with these ethical concerns.
|
|
New population mean of flightpro map
: After the software update, you do not know the new population mean of FlightPro map download speeds on electronic devices, but you do know that the standard.
|
|
How did this loss affect the person mentally
: When he/she experienced this loss, what emotions, feelings, thought, and physical symptoms did the person experience?
|
|
Proportion of time employee remembers
: One of the statistics collected is the proportion of time employee remembers to include a coupon for the next purchase in the bag.
|
|
What is the maximum superimposed load
: After the concrete cures and reaches its full strength, what is the maximum superimposed load (psf) that the floor can support
|
|
Design control strategy-manipulate high-pressure gas valve
: Consider the turbine/compressor process shown in Fig. The motive force for the turbine, T-201, is a high-pressure gas, and the compressor, C-103, compresses.
|