Question
In: Statistics and Probability
8 A local article reported that nationally 15% of all traffic accidents this year were attributed...
8 A local article reported that nationally 15% of all traffic accidents this year were attributed to road rage. A random sample of 80 accident reports from your county in the last month indicate that 10 were due to road rage.
a. Find ?̂.
b. Find a confidence interval for the population mean (to 3 decimal places). Note which software you use, or use a formula.
c. If you were going to perform a hypothesis test to prove that your county’s road rage accident rate is lower than the national average, what would your hypotheses be?
d. Complete a hypothesis test to determine if there is enough statistical evidence to support your hypothesis in part c. Use a 0.10 level of significance. Indicate what your critical value is, your p-value & write a conclusion in the context of the your hypotheses.
Solutions
orchestra answered 1 year agoRelated Solutions
Among all the car accidents last year, 492 deaths were reported in the road of which...
Among all the car accidents last year, 492 deaths were reported in
the road of which 240 wore belts and 252 wore no belts. Of the 2334
people involved in serious accidents 1945 wore seat belts and the rest
no
to. Calculate the probability of dying by not wearing a belt
b. Calculate the probability of dying if you wear the belt
c. If a person dies in a car accident; What is the probability of
who will wear a...
The National Highway Traffic Safety Administration reported the percentage of traffic accidents occurring each day of...
The National Highway Traffic Safety Administration reported the
percentage of traffic accidents occurring each day of the week.
Assume that a sample of 420 accidents provided the following
data.
Sunday
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
66
50
52
47
56
69
80
(a) Conduct a hypothesis test to determine if the proportion of
traffic accidents is the same for each day of the week. Use a 0.05
level of significance.
State the null and alternative hypotheses:
A. H0: Not...
The National Highway Traffic Safety Administration reported the percentage of traffic accidents occurring each day of...
The National Highway Traffic Safety Administration reported the
percentage of traffic accidents occurring each day of the week.
Assume that a sample of 420 accidents provided the following data.
Sunday 63. Monday 47. Tuesday 55. Wednesday 45. Thursday 57. Friday
67. Saturday 86. 1)Conduct a hypothesis test to determine if the
proportion of traffic accidents is the same for each day of the
week. What is the p-value? 2. Compute the value of the x^2 test
statistic (to 3 decimals)....
The National Highway Traffic Safety Administration reported the percentage of traffic accidents occurring each day of...
The National Highway Traffic Safety Administration reported the
percentage of traffic accidents occurring each day of the week.
Assume that a sample of 420 accidents provided the following
data.
Sunday
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
66
50
53
48
54
69
80
(a)
Conduct a hypothesis test to determine if the proportion of
traffic accidents is the same for each day of the week. Use a 0.05
level of significance.
State the null and alternative hypotheses.
H0: pSun =...
The National Highway Traffic Safety Administration reported the percentage of traffic accidents occurring each day of...
The National Highway Traffic Safety Administration reported the
percentage of traffic accidents occurring each day of the week.
Assume that a sample of 420 accidents provided the following
data.
Sunday
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
67
50
53
47
55
68
80
Find the value of the test statistic. (Round your answer to
three decimal places.)
Find the p-value. (Round your answer to four decimal
places.)
p-value =
Compute the percentage of traffic accidents occurring on each
day of...
2. In 2009 it was reported that 45% of all car accidents in Buffalo were alcohol...
2. In 2009 it was reported that 45% of all car accidents in
Buffalo were alcohol related. Suppose we take a random sample of
200 car accidents in Buffalo and let X be the number which are
alcohol related.
a. Define the random variable X of the form )
Find the probability that fewer than half (less than 100) were
alcohol related.
Find the prob. that between 60 and 80, inclusive, were alcohol
related.
Find the probability at least 90...
In 2003, it was reported that 40% of all car accidents in Connecticut were alcohol related....
In 2003, it was reported that 40% of all car accidents in
Connecticut were alcohol related. Suppose we take a random sample
of 100 car accidents in Connecticut and let X be the number that
are alcohol related.
Find the probability that at least 40 were alcohol related
and at least 40 were not alcohol
related.
During rush hour, from 8 am to 9 am, traffic accidents occur according to a Poisson...
During rush hour, from 8 am to 9 am, traffic accidents occur
according to a Poisson process with a rate of 5 accidents per hour.
Between 9 am and 11 am, they occur as an independent Poisson
process with a rate of 3 accidents per hour. What is the PMF of the
total number of accidents between 8 am and 11 am?
At a certain black spot, the number of traffic accidents per year follows a Po 10,000)-distribution....
At a certain black spot, the number of traffic accidents per
year follows a Po 10,000)-distribution. The number of deaths per
accident follows a Po(0.1)-distribution, and the number of
casualties per accidents follows a Po(2)-distribution. The
correlation coefficient between the number of casualties and the
number of deaths per accidents is 0.5. Compute the expectation and
variance of the total number of deaths and casualties during a
year.
The U.S. Department of Transportation, National Highway Traffic Safety Administration, reported that 77% of all fatally...
The U.S. Department of Transportation, National Highway Traffic
Safety Administration, reported that 77% of all fatally injured
automobile drivers were intoxicated. A random sample of 51 records
of automobile driver fatalities in a certain county showed that 33
involved an intoxicated driver. Do these data indicate that the
population proportion of driver fatalities related to alcohol is
less than 77% in Kit Carson County? Use α = 0.10.
(a) What is the level of significance?
State the null and alternate...
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