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Q1) Number of minor automobile accidents happens at different high-risk intersections in Teton Country despite traffic lights. Traffic Department claims that modification in type of light will decrease these accidents. Country commissioners have agreed to proposed experiment. Eight intersections were selected at random, and lights at those intersections were altered. Numbers of minor accidents during six-month period before and after modifications were:
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
At 0.01 significance level is it sensible to conclude that modification reduced number of traffic accidents?
Utilizing the 5% level of significance as there was a significant change in cholesterol level. Their total cholesterol levels before also after the diet.
For a regional survey of suburban households to obtain data on television viewing habits, a statistical sample of suburban areas is first selected. Within the chosen areas, statistical samples of whole blocks are selected; and within the selected..
(A) What sums are needed to calculate a correlation coefficient? (B) What are the two ways of testing a correlation coefficient for significance?
The following table shows the number of miles driven in each trial.
The hypothesis that the samples came from identical populations cannot be rejected, the T value is 16.5 greater that the lower limit.
Make a forecast for 2004, using either the fitted trend model or a judgment forecast. Why is it best to ignore earlier years in this data set?
Evaluate your histograms for any outliers in your data. Based on your evaluation of outliers, you may trim no more than 1% of the data contained in the data set. This must be done symmetrically (i.e., trimming no more than 0.5% off the top and 0.5..
Given the following data on hotel check-ins for a 6-month period:
Draw a scatter diagram and consider the correlation for the provided data. Do larger universities tend to have more property crime.
Construct a 99% confident interval for the standard deviation of the amount of vitamin B6 per pill.
Construct a 90 percent confidence interval for the true mean weight. Describe factors which might cause variation in the weight of Tootsie Rolls during manufacture.
Test the hypothesis that no difference exists between the groups at α = .05 and perform and report all related tests and statistics.
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