Question
In: Statistics and Probability
Please assist with the following: The National Highway Traffic Safety Administration (NHTSA) conducted a survey to...
Please assist with the following:
The National Highway Traffic Safety Administration (NHTSA) conducted a survey to learn about how drivers throughout the United States are using seat belts (Associated Press, August 25, 2003). Sample data consistent with the NHTSA survey are as follows:
- For the United States, what is the probability that a
- The seat belt usage probability for a U.S. driver a year earlier was .75. NHTSA chief Dr. Jeffrey Runge had hoped for a .78 probability in 2003. Would he have been pleased with the 2003 survey results?
- What is the probability of seat belt usage by region of the country? What region has the highest seat belt usage?
- What proportion of the drivers in the sample came from each region of the country? What region had the most drivers selected? What region had the second most drivers selected?
- Assuming the total number of drivers in each region is the same, do you see any reason why the
probability estimate in part (a) might be too high? Explain.
Solutions
orchestra answered 1 year agoRelated Solutions
A study conducted under the auspices of the National Highway Traffic Safety Administration found that the...
A study conducted under the auspices of the National Highway
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fatal crashes caused by the drowsy drivers each year was 1550
(Business Week, January 26, 2015). Assume the annual number of
fatal crashes per year is normally distributed with a standard
deviation of 300 and mean of 1550.
For a year to be in the top 2.5 % of the distribution with
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Tests of Child Booster Seats The National Highway Traffic Safety Administration conducted crash tests of child...
Tests of Child Booster Seats The National Highway Traffic Safety
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cars. Listed below are results from those tests, with the
measurements given in HIC (standard head injury condition
units). The safety requirement is that the HIC measurement should
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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 reports the percentage of traffic accidents occurring each day of...
The National Highway Traffic Safety Administration reports the
percentage of traffic accidents occurring each day of the week.
Assume that a sample of 420 accidents provided the following
date.
Sunday
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Total
66
50
53
47
55
69
80
420
Conduct a hypothesis test to determine whether the proportion of
traffic accidents is the same for each day of the week. Using a .05
level of significance, what is your conclusion?
1. Which is the...
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...
The U.S. National Highway Traffic Safety Administration gathers data concerning the causes of highway crashes where...
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data concerning the causes of highway crashes where at least one
fatality has occurred. From the 1998 annual study, the following
probabilities were determined (BAC is blood-alcohol level):
?(???=0|Crash with fatality)=0.631P(BAC=0|Crash with
fatality)=0.631
?(??? is between .01 and .09|Crash with fatality)=0.325P(BAC is
between .01 and .09|Crash with fatality)=0.325
?(??? is greater than .09|Crash with fatality)=0.098P(BAC is
greater than .09|Crash with fatality)=0.098
Suppose over a certain stretch of highway during a 1-year
period,...
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...
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 52records
of automobile driver fatalities in a certain county showed that 32
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 hypotheses....
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