Bonus: Use vour calculator and create a 95% confidence interval for this same data Notice that zero is no longer in the CI. Explain why this is true (1.741a, sa, a59) The t becemesmaller, which causes less to be Svbtracted. This also happens because the Ilowes confidence interval, the more -precise the interval is. In fact, there IS a difference between the amount of money spent on books at BU and at UMASS Amherst. What error was committed when you ran your test? o What two things could you change about this problem to detect the difference?

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The attachment that starts with C has the main question, which I’ve answered, then the second pic has the 2 questions I’m having a problem with. The two that start with “in fact there is a difference” and “what two things could you change”.
45.04
27 33 72
6.72, 60.7a)
trage, between $6.7a less and $60.7a more the
UMASS Amherst students.
Ronus: Use your calculator and create a 95% confidence interval for this same data
Notice that zero is no longer in the CI. Explain why this is true.
(1.741a, sa. a59)
The t becemesmaller, which causes less to be Subtracted. This also happens because the Ilower the
confidence interval, the more -precise the interval is.
In fact, there IS a difference between the amount of money spent on books at BU and at
UMASS Amherst. What error was committed when you ran your test?
o What two things could you change about this problem to detect the difference?
What are the implications of making these changes?
Calculator Steps/TI Tips:
Transcribed Image Text:45.04 27 33 72 6.72, 60.7a) trage, between $6.7a less and $60.7a more the UMASS Amherst students. Ronus: Use your calculator and create a 95% confidence interval for this same data Notice that zero is no longer in the CI. Explain why this is true. (1.741a, sa. a59) The t becemesmaller, which causes less to be Subtracted. This also happens because the Ilower the confidence interval, the more -precise the interval is. In fact, there IS a difference between the amount of money spent on books at BU and at UMASS Amherst. What error was committed when you ran your test? o What two things could you change about this problem to detect the difference? What are the implications of making these changes? Calculator Steps/TI Tips:
rokTMately symmetric and unimodal
Independent Groups Assumption: The two
of each other.
must be independent
g roups we're
comparing
C. Example: A recent survey of 28 students at Boston University indicates that the students
spent (on average) $394/year on text books with a standard deviation of $57. At UMASS
Amherst, however, a survey of 35 found that students spent (on average) $367/year with a
standard deviation of $38. B= Boston University
U= UMASS Amherst
ng 28
nu= 35
Xe= $394/year
Ku$367/ year
S $38
Xョ- ヌ=$a9+-$367= $a7
Transcribed Image Text:rokTMately symmetric and unimodal Independent Groups Assumption: The two of each other. must be independent g roups we're comparing C. Example: A recent survey of 28 students at Boston University indicates that the students spent (on average) $394/year on text books with a standard deviation of $57. At UMASS Amherst, however, a survey of 35 found that students spent (on average) $367/year with a standard deviation of $38. B= Boston University U= UMASS Amherst ng 28 nu= 35 Xe= $394/year Ku$367/ year S $38 Xョ- ヌ=$a9+-$367= $a7
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