Question
In: Statistics and Probability
A study of the ages of motorcyclists killed in crashes involves the random selection of 164...
A study of the ages of motorcyclists killed in crashes involves
the random selection of 164 drivers with a mean of 37.09 years.
Assuming that sigmaequals11.7 years, construct and interpret a
99% confidence interval estimate of the mean age of all
motorcyclists killed in crashes.
Click here to view a t distribution table.LOADING...
Click here to view page 1 of the standard normal distribution
table.LOADING...
Click here to view page 2 of the standard normal distribution
table.LOADING...
What is the 99% confidence interval for the population mean
u?
__<___ (Round to two decimal places as needed.)
Solutions
Expert Solution
Solution :
Given that,
Point estimate = sample mean = 
= 37.09
Population standard deviation = 
= 11.7
Sample size = n =164
At 99% confidence level the z is ,
= 1 - 99% = 1 - 0.99 =
0.01
/ 2 = 0.01 / 2 = 0.005
Z/2
= Z0.005 = 2.576 ( Using z table )
Margin of error = E = Z/2*
(
/
= 2.576 * ( 11.7/
E= 2.35
At 99% confidence interval estimate of the population mean is,
- E < 
<
+ E
37.09 -2.35 <
<37.09+ 2.35
34.74<
< 39.44
(34.74, 39.44 )
orchestra answered 1 year agoRelated Solutions
A study of the ages of motorcyclists killed in crashes involves the random selection of 132...
A study of the ages of motorcyclists killed in crashes involves
the random selection of 132
drivers with a sample mean of 32.95 years. Assume that the
SAMPLE standard deviation is 9.4 years. a) Find the critical value
tα /2 for a 90% confidence interval
b) Construct and interpret the 90% confidence interval estimate
of the mean age of all motorcyclists killed in crashes. Use the
z-table method.
dence interval.
Question 2. Randomly selected statistics students of the author
participated...
A study of the ages of motorcyclists killed in crashes involves the random selection of 168...
A study of the ages of motorcyclists killed in crashes involves
the random selection of 168 drivers with a mean of 36.53 years.
Assuming that σ=8.2 years, construct and interpret a 95%
confidence interval estimate of the mean age of all motorcyclists
killed in crashes. (Don't round until end of problem)
What is the 95% confidence interval for the population mean
μ?
______<μ<______
The following data lists the ages of a random selection of actresses when they won an...
The following data lists the ages of a random selection of
actresses when they won an award in the category of Best Actress,
along with the ages of actors when they won in the category of Best
Actor. The ages are matched according to the year that the awards
were presented. Complete parts (a) and (b) below. Actress left
parenthesis years right parenthesis 31 30 31 28 33 23 24 38 33 32
Actor left parenthesis years right parenthesis 67...
The following data lists the ages of a random selection of actresses when they won an...
The following data lists the ages of a random selection of
actresses when they won an award in the category of Best Actress,
along with the ages of actors when they won in the category of Best
Actor. The ages are matched according to the year that the awards
were presented. Complete parts (a) and (b) below. Actress left
parenthesis years right parenthesis 29 30 29 30 33 29 26 37 29 34
Actor left parenthesis years right parenthesis 58...
The following data lists the ages of a random selection of actresses when they won an...
The following data lists the ages of a random selection of
actresses when they won an award in the category of Best Actress,
along with the ages of actors when they won in the category of Best
Actor. The ages are matched according to the year that the awards
were presented. Complete parts (a) and (b) below.
Actress left parenthesis years right parenthesis
29
25
34
27
38
26
26
45
27
36
Actor left parenthesis years right parenthesis
62...
The following data lists the ages of a random selection of actresses when they won an...
The following data lists the ages of a random selection of
actresses when they won an award in the category of Best Actress,
along with the ages of actors when they won in the category of Best
Actor. The ages are matched according to the year that the awards
were presented. Complete parts (a) and (b) below.
Actress left parenthesis years right parenthesisActress
(years)
30
31
29
27
33
25
24
37
29
37
Actor left parenthesis years right parenthesisActor...
The following data lists the ages of a random selection of actresses when they won an...
The following data lists the ages of a random selection of
actresses when they won an award in the category of Best Actress,
along with the ages of actors when they won in the category of Best
Actor. The ages are matched according to the year that the awards
were presented. Complete parts (a) and (b) below
Actress (years) Actor (years)
25 64
31 37
29 35
31 39
34 31
29 36
26 53
40 37
29 39
Use...
The following data lists the ages of a random selection of actresses when they won an...
The following data lists the ages of a random selection of
actresses when they won an award in the category of Best Actress,
along with the ages of actors when they won in the category of Best
Actor. The ages are matched according to the year that the awards
were presented. Complete parts (a) and (b) below.
Actress (years)
29
25
33
27
34
28
24
41
31
33
Actor (years)
68
34
35
37
27
34
49
38
33...
The following data lists the ages of a random selection of actresses when they won an...
The following data lists the ages of a random selection of
actresses when they won an award in the category of Best Actress,
along with the ages of actors when they won in the category of Best
Actor. The ages are matched according to the year that the awards
were presented. Complete parts (a) and (b) below. Actress (years)
27 29 28 28 35 25 27 41 29 33 Actor (years) 62 38 33 41 28 35 47 37
37...
The following data lists the ages of a random selection of actresses when they won an...
The following data lists the ages of a random selection of
actresses when they won an award in the category of Best Actress,
along with the ages of actors when they won in the category of Best
Actor. The ages are matched according to the year that the awards
were presented. Complete parts (a) and (b) below.
Use a 0.01 significance level
H0: μd = 0 years
H1: μd< 0 years
Actress (years)
28
31
28
27
33
26
24...
ADVERTISEMENT
ADVERTISEMENT
Latest Questions
- Q. Compare and contrast Ripple-Carry Adder and Carry-Look ahead Adder 1) In a 4-bit ripple-carry adder...
- 1. How are a buffer and a NOT gate similar? 2. How are a buffer and...
- Section 9.4 Practice Problems: 2. How many CSUN students would have to be polled to determine...
- Cybersecuirty Describe the different types of firewalls that are on the market and how they differ...
- Please take time to view the video, “Was America Founded to Be Secular? “ as a...
- 7. A health psychologist knew that corporate executives in general have an average score of 80...
- Submission Guidelines This assignment may be submitted for full credit until Friday, October 4th at 11:59pm....
ADVERTISEMENT