MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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Transcribed Image Text:Shade the sampling distribution curve with the correct critical value(s) and shade the critical regions. The arrows
can only be dragged to t-scores that are accurate to 1 place after the decimal point (these values correspond to
the tick marks on the horizontal axis). Select from the drop down menu to shade to the left, to the right,
between or left and right of the t-score(s), then drag shaded area to match your critical value(s).
Shade: Left of a value
+++++
-4
-3
-2
-1.5
Click and drag the arrows to adjust the values.
0
The correct decision is to Select an answer
1
2
The correct summary would be: Select an answer
time to complete the SAT has significantly changed from 2.4 hours.
3
that the population mean
Transcribed Image Text:The time to complete the Advanced Placement (AP) Statistics Exam in previous years is normally distributed with
an average time of 2.4 hours. Because of school closures due to COVID-19, the College Board offered an at-
home test for the 2020 AP Statistics Exam. A teacher feels that students, on average, will have a different
completion time for the at-home exam. They take a random sample of 27 students that took the exam and
their mean time was 2.74 hours with a standard deviation of 0.3 hours. Test to see if the mean time has
significantly changed using a 5% level of significance. Give answers to at least 4 decimal places.
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