Question

Car and Taxi Ages The mean age of cars is no more than the mean age of taxis. A sample of 22 cars reveal a mean age of 10.2 years with a standard deviation of 2.6 years. A sample of 38 cars reveal a mean age of 11.4 years with a standard deviation of 3.2 years. Use the 10% level of significance to answer the following questions.

39. What is the hypothesis?

40. What are your critical value(s)?

41. What is your test statistic?

42. What is your conclusion?

Answer #1

A sample of 17 randomly selected student cars have ages with a
mean of 7.8 years and a standard deviation of 3.6 years, while a
sample of 22 randomly selected faculty cars have ages with a mean
of 5.6 years and a standard deviation of 3.3 years.
1. Use a 0.05 significance level to test the claim that student
cars are older than faculty cars.
(a) The test statistic is 1.9619
(b) The critical value is 1.688
(c) Is there...

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sample of 22 randomly selected faculty cars have ages with a mean
of 5.6 years and a standard deviation of 3.3 years.
1. Use a 0.05 significance level to test the claim that student
cars are older than faculty cars.
(a) The test statistic is
(b) The critical value is
(c) Is there sufficient evidence...

A student researcher compares the ages of cars owned by students
and cars owned by faculty at a local state college. A sample of 98
cars owned by students had an average age of 8.57 years. A sample
of 146 cars owned by faculty had an average age of 8.1 years.
Assume that the population standard deviation for cars owned by
students is 2.89 years, while the population standard deviation for
cars owned by faculty is 3.85 years. Determine the...

A student researcher compares the ages of cars owned by students
and cars owned by faculty at a local state college. A sample of 224
cars owned by students had an average age of 5.06 years. A sample
of 233 cars owned by faculty had an average age of 7.19 years.
Assume the standard deviation is known to be 3.42 years for age of
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Randomly selected 30 student cars have ages with a mean of 7
years and a standard deviation of 3.6 years, while randomly
selected 23 faculty cars have ages with a mean of 5.9 years and a
standard deviation of 3.5 years.
1. Use a 0.01 significance level to test the claim that student
cars are older than faculty cars.
(a) The test statistic is
(b) The critical value is
(c) Is there sufficient evidence to support the claim that
student...

A student researcher compares the ages of cars owned by students
and cars owned by faculty at a local state college. A sample of
233233 cars owned by students had an average age of 6.626.62 years.
A sample of 280280 cars owned by faculty had an average age of
7.947.94 years. Assume that the population standard deviation for
cars owned by students is 2.132.13 years, while the population
standard deviation for cars owned by faculty is 3.143.14 years.
Determine the...

A student researcher compares the ages of cars owned by students
and cars owned by faculty at a local state college. A sample of 233
cars owned by students had an average age of 6.62 years. A sample
of 280 cars owned by faculty had an average age of 7.94 years.
Assume that the population standard deviation for cars owned by
students is 2.13 years, while the population standard deviation for
cars owned by faculty is 3.14 years. Determine the...

A college admissions director wishes to estimate the mean age of
all students currently enrolled. In a random sample of 22 students,
the mean age is found to be 21.4 years. From past studies, the ages
of enrolled students are normally distributed with a standard
deviation of 10.2 years. Construct a 90% confidence interval for
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1. What is the Critical value?

Randomly selected 130 student cars have ages with a mean of 7.9
years and a standard deviation of 3.4 years, while randomly
selected 65 faculty cars have ages with a mean of 5.7 years and a
standard deviation of 3.3 years. 1. Use a 0.02 significance level
to test the claim that student cars are older than faculty cars.
The test statistic is The critical value is Is there sufficient
evidence to support the claim that student cars are older...

Randomly selected 17 student cars have ages with a mean of 7
years and a standard deviation of 3.6 years, while randomly
selected 20 faculty cars have ages with a mean of 5.6 years and a
standard deviation of 3.7 years.
1. Use a 0.05 significance level to test the claim that student
cars are older than faculty cars.
(a) The test statistic is
(b) The critical value is
(c) Is there sufficient evidence to support the claim that
student...

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