Question

the national highway traffic safety administration stated that the percentage of people who used their seatbelts in the year 2002 was 71% . the nhtsa also reported that a random sample of 3005 people showed that 2104 reported using their seatbelts in 2012. conduct a hypothesis test at a significance level of 10% to see weather the percentage of people who used their seatbelts in 2012 changed from 71% reported in the year 2002

Answer #1

1. The National Highway Traffic Safety Administration (NHTSA)
states that the percentage of people who used their seatbelts in
the year 2001 was 72%. The NHTSA also reported that a random sample
of 3000 people showed that 2210 reported using their seatbelts in
2011. Conduct a hypotheses test at a significance level of 5% to
see whether thepercentage of people who used their seatbelts in
2011 changed from the 72% reported the year 2001

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
69
47
54
49
58
69
74
a. 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?
Compute the value of the X2 test statistic (to 3
decimals)....

3. The US. Department of Transportation, National Highway
Safety Traffic Safety Administration reported that 77% of all
fatally injured automobile drivers were intoxicated. A random
sample of 65 automobile driver fatalities in Dallas County (1996)
showed that 43 involved an intoxicated driver. Construct a 96%
confidence interval to estimate the proportion of all Dallas County
automobile driver fatalities who were intoxicated. Based on your
interval, do you think that
the Dallas County rate is substantially lower than the
national rate?...

The National Highway Traffic Safety Administration reports the
number of
traffic fatalities for 2011, 2012 and 2013 for various types of
a passenger cars.
Subcompact Compact Intermediate Full-Size Other
Total
2011
1352
3801
4066
2647
148 12014
2012
1360
3866
4088
2860
187 12361
2013
1206
3610
4083
2830
248 11977
Total
3918
11277
12237
8337
583 36352
(a) Draw a bar chart for the distribution of year
(total),
(b) Draw a pie chart for the distribution of year...

The National Highway Traffic Safety Administration reports the
number of
traffic fatalities for 2011, 2012 and 2013 for various types of
a passenger cars.
Subcompact Compact Intermediate Full-Size Other
Total
2011
1352
3801
4066
2647
148 12014
2012
1360
3866
4088
2860
187 12361
2013
1206
3610
4083
2830
248 11977
Total
3918
11277
12237
8337
583 36352
(a) Draw a bar chart for the distribution of year
(total),
(b) Draw a pie chart for the distribution of year...

_____ According to the National Highway and Traffic Safety
Administration, the proportion of fatal traffic accidents in the
U.S. in which the driver had a positive blood alcohol concentration
(BAC) is 0.36. Suppose a random sample of 105 traffic fatalities in
the state of Hawaii results in 41 that involved a positive BAC.
Does the sample evidence suggest that Hawaii has a higher
proportion of traffic fatalities involving a positive BAC than the
general U.S.? Test at the 0.05 level...

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 54 records
of automobile driver fatalities in a certain county showed that 35
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 = 0.05.
(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 injured automobile
drivers were intoxicated. A random sample of 29 records of
automobile driver fatalities in kit Carson county, Colorado, showed
that 15 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 level of significance
=0.01. Solve the problem using both the traditional method and the...

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 50 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 National Highway Traffic Safety Administration indicated
that 284 people died between 1990 and 2007 as a result of an injury
caused by an airbag. Newer airbags open at a speed proportional to
the speed of an impact. Older models open at a constant speed, up
to 200mph, equal to the force of a heavyweight knockout punch. A
random sample of 40 older-model airbags was obtained and tested.
The average opening speed for each older-model airbag was 173.88.
Airbag opening...

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