Question

Cars on Campus. Statistics students at a community college wonder whether the cars belonging to students are, on average, older than the cars belonging to faculty. They select a random sample of 37 cars in the student parking lot and find the average age to be 8.5 years with a standard deviation of 6 years. A random sample of 32 cars in the faculty parking lot have an average age of 5.1 years with a standard deviation of 4.1 years. Note: The degrees of freedom for this problem is df = 63.777523. Round all results to 4 decimal places. Remember not to round for intermediate calculations! 1. The null hypothesis is ?0:??=??. What is the alternate hypothesis? A. ??:??<?? B. ??:??≠?? C. ??:??>?? 2. Calculate the test statistic. = 3. Calculate the p-value for this hypothesis test. p value = 4. Suppose that students at a nearby university decide to replicate this test. Using the information from the community college, they calculate an effect size of 0.65. Next, they obtain samples from the university student and faculty lots and, using their new sample data, conduct the same hypothesis test. They calculate a p-value of 0.0414 and an effect size of 0.299. Do their results confirm or conflict with the results at the community college? A. It confirms the community college results because the effect size is nearly the same. B. It contradicts the community college results because the effect size is much smaller. C. It contradicts the community college results because the p-value is much bigger D. It confirms the community college results because the p-value is much smaller. E. It can neither confirm or contradict the community college results because we don't know the sample sizes the university s

Answer #1

The statistical software output for this problem is:

On the basis of above output:

1. **Option C** is correct.

2. t = **2.7777**

3. p - Value = **0.0036**

4. It contradicts the community college results because the effect size is much smaller.

Cars on Campus. Statistics students at a
community college wonder whether the cars belonging to students
are, on average, older than the cars belonging to faculty. They
select a random sample of 49 cars in the student parking lot and
find the average age to be 9.7 years with a standard deviation of
6.7 years. A random sample of 49 cars in the faculty parking lot
have an average age of 3.1 years with a standard deviation of 3.2
years....

Is there a difference between community college statistics
students and university statistics students in what technology they
use on their homework? Of the randomly selected community college
students 43 used a computer, 72 used a calculator with built in
statistics functions, and 65 used a table from the textbook. Of the
randomly selected university students 28 used a computer, 33 used a
calculator with built in statistics functions, and 40 used a table
from the textbook. Conduct the appropriate hypothesis...

10)
We conduct a study to determine whether the majority of
community college students plan to vote in the next presidential
election. We choose a significance level of 0.05. We survey 650
randomly selected community college students and find that 54% of
them plan to vote. The P-value is 0.02.
H0: 50% of community college students plan to vote in
the next presidential election.
Ha: More than 50% of community college students plan
to vote in the next presidential election....

A group of university students are interested in comparing the
average age of cars owned by students and the average age of cars
owned by faculty. They randomly selected 25 cars that are own by
students and 20 cars that are owned by faculty. The average age and
standard deviation obtained from the students’ cars are 6.78 years
and 5.21 years, respectively. The sample of faculty cars produced a
mean and a standard deviation of 5.86 years, and 2.72.
At...

College students and STDs: A recent report estimated
that 25% of all college students in the United States have a
sexually transmitted disease (STD). Due to the demographics of the
community, the director of the campus health center believes that
the proportion of students who have a STD is lower at his
college.
He tests H0: p = 0.25 versus Ha: p <
0.25. The campus health center staff select a random sample of 50
students and determine that 18%...

The college board claims that 32% of community college students
take five semesters to complete a two-year program. In a survey of
1400 randomly selected community college students enrolled in a
two-year program, 401 of them took five semesters to complete their
two-year program. Test the college board's claim at a level of
significance of 0.01.
Calculate the test statistics associated with this
hypothesis.
(Round your answer to 2 decimal places)
Calculate the P-Value associated with the test
statistics that...

Throughout the country, the proportion of first-time, first-year
community college students who return for their second year of
studies is p = 0.52 according to the Community College Survey of
Student Engagement. Suppose a community college institutes new
policies geared toward increasing student retention. The first year
this policy was in place there were n = 2843 first-time, first-year
students (N = 1, 050,000). Of these students, x = 1516 returned for
their second year of studies. Treat these students...

Weight gain during pregnancy. In 2004, the
state of North Carolina released to the public a large data set
containing information on births recorded in this state. This data
set has been of interest to medical researchers who are studying
the relationship between habits and practices of expectant mothers
and the birth of their children. The following histograms show the
distributions of weight gain during pregnancy by 865 younger moms
(less than 35 years old) and 137 mature moms (35...

10. The institutional researcher at a community college reads
that the persistence rate (percent of students who return to
college for the next academic year) is higher for full-time
students as compared to part-time students. He decides to test this
out at his college. He tracks a randomly selected randomly selected
sample of 350 full- time students and 480 part-time students. Of
the 350 full-time students, 316 return to college the next year. Of
the 480 part-time students, 319 return...

Weight gain during pregnancy. In 2004, the state of North
Carolina released to the public a large data set containing
information on births recorded in this state. This data set has
been of interest to medical researchers who are studying the
relationship between habits and practices of expectant mothers and
the birth of their children. The following histograms show the
distributions of weight gain during pregnancy by 862 younger moms
(less than 35 years old) and 126 mature moms (35...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 1 minute ago

asked 3 minutes ago

asked 3 minutes ago

asked 10 minutes ago

asked 38 minutes ago

asked 42 minutes ago

asked 48 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 2 hours ago