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Compare the two groups using Paired sample t-test.
A number of minor automobile accidents occur at various high-risk intersections in Teton County despite traffic lights. The Traffic Department claims that a modification in the type of light will reduce these accidents. The county commissioners have agreed to a proposed experiment. Eight intersections were chosen at random, and the lights at those intersections were modified. The number of minor accidents during a six-month period before and after modification was:
Number of Accidents
A
B
C
D
E
F
G
H
Before modification
5
7
6
4
8
9
10
After modification
3
0
2
These samples are "paired" (really just one sample, two observations, right?)
Required:
At the .01 significance level is it reasonable to conclude that the modification reduced the number of traffic accidents? Show all steps.
What is the likelihood all four of the selected flights arrived within 15 minutes of the scheduled time?
Create a scatterlpot of P_RFM and P_HELM. If drawing plot by hand, use graph paper to make sure accuracy. Be sure you label axes. After you have created the scatterplot, consider its form and direction. Recognize outliers, if any.
A random sample of 15 paired observations has a correlation of -.46. Can we conclude that the correlation in the population is less than zero? Use the .05 significance level.
Be sure the appropriate assumptions and conditions are satisfied before you proceed.
Determine whether the method of delivering teaching influences adherence with antiretroviral therapy.
Multiple choice question using Forecasting techniques. Which among of the following models are best suited to forecast a time series with a stable seasonality component.
Assess the model fit for the multiple linear regression model using appropriate statistics and graphics.
Explain the strength of relationship between the assets?
Fast Service Truck Lines uses the Ford Super Duty F-750 exclusively. Management made a study of the maintenance costs and determined the number of miles traveled during the year followed the normal distribution. The mean of the distribution was 60..
A sample of 160 workers in the downtown area classified each worker by race. A bar graph of the results is given below, but the bar for black workers in the graph below has been omitted.
How likely is it that the store owner will make at least $7,000 if she implements your suggestion?
See if there is a difference in their means and variances.
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