Question

A
student at South Plains College claims that the average cost of
textbook is more than $75 dollars. Test this student’s claim using
a 0.05 level of significance. A random sample of 15 textbooks had
an average price of $78.15 and a standard deviation of $8.80. (8
pts)

Answer #1

6. A university student claims that on average, full-time
students study more than 30 hours per week. A statistics class
conducts a study to test the claim. The students randomly sample 15
students and find ?=32.4 hours and ?=4.2 hours.
a) State the null and alternative hypotheses.
b) Determine the outcome of the student’s test at the:
i) At the 5% significance level. (∝=0.05) ii) At the 1%
significance level. ∝=0.01

An employment information service claims the mean annual pay for
full-time college student is $16,000 with a standard deviation of
$2,000. The annual pay for a random sample of 15 full-time college
student is $17,250. At α=0.05, test the claim that the mean salary
is $16,000.

The Rocky Mountain district sales manager of Rath Publishing
Inc., a college textbook publishing company, claims that the sales
representatives make an average of 50 sales calls per week on
professors. Several reps say that this estimate is too low. To
investigate, a random sample of 28 sales representatives reveals
that the mean number of calls made last week was 51. The standard
deviation of the sample is 1 calls. Using the 0.05 significance
level, can we conclude that the...

The average student loan debt for 2016 college graduates who
borrowed to get through school was $37,172. Is this still true
today? You get a random sample of 150 recent college graduates and
find that their mean student loan is $36,654 with a standard
deviation of $4,000. Test the claim at the 5% significance level
using PHANTOMS.

A college claims that commute times to
the school have a mean of 60 minutes with a standard deviation of
12 minutes. Assume that student commute times at this
college are normally distributed. A statistics student
believes that the variation in student commute times is greater
than 12 minutes. To test this a sample of 71 students in
chosen and it is found that their mean commute time is 58 minutes
with a standard deviation of 14.5 minutes.
At the 0.05 level of...

A diet doctor claims that the average North American is more
than 20 pounds overweight. To test his claim, a random sample of 20
North Americans was weighed, and the difference between their
actual and ideal weights was calculated. The data is listed below:
16 23 18 41 22 18 23 19 22 15 18 35 16 15 17 19 23 15 16 26 The
sample statistics are: ?̅ = 20.85, ? = 6.76. Can we infer, at the
5%...

A diet doctor claims that the average North American is more
than 20 pounds overweight. To test his claim, a random sample of 20
North Americans was weighed, and the difference between their
actual and ideal weights was calculated.
The data is listed below:
16 23 18 41 22 18 23 19 22 15
18 35 16 15 17 19 23 15 16 26
The sample statistics are: ?̅= 20.85, ? = 6.76.
Can we infer, at the 5% significance...

The student academic group on a college campus claims that
freshman students study at least 2.5 hours per day, on average. One
Introduction to Statistics class was skeptical. The class took a
random sample of 30 freshman students and found a mean study time
of 137 minutes with a standard deviation of 45 minutes. If α = 0.01
(or 99% confidence level), is the student academic group’s claim
correct?

Researchers claim that the birth rate in Bonn, Germany is more
than the national average. A sample of 1200 Bonn residents produced
12 births in 2018, whereas a sample of 1000 people from all over
Germany had 8 births the same year. Test this claim at the 0.05
level of significance.

A consumer advocate
group claims the average American household spends more than $874
during Christmas. The claim is tested with a sample of 64
households and finds the average of the sample to be $905 with a
standard deviation of $125. Level of significance is 0.05. Answer
the following:
a) write Ho and Ha and
identify which is the claim
b) identify whether
its left, right or two tailed
c) write the
p-value
d) decide whether to
reject or fail...

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