franchise thinks that its cost is below that figure. Arandom sample of 28 patients across the country had anaverage cost of $5250 with a standard deviation of $629At a 0.025, can it be concluded that the mean is lessthan $5400?9. Heights of Tall Buildings A researcher estimates thatthe average height of the buildings of 30 or more storiesin a large city is at least 700 feet. A random sample of10 buildings is selected, and the heights in feet are shown.At a 0.025, is there enough evidence to reject the claim?485511841725615520535635616582Source: Pittsburgh Tribune-Review.10. Number of Words ina Novel The National NovelWriting Association states that the average novel is atleast 50,000 words. A particularly ambitious writing

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Asked Nov 8, 2019
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I need help with question 9 as an example because I am missing the notes. Thank you.

franchise thinks that its cost is below that figure. A
random sample of 28 patients across the country had an
average cost of $5250 with a standard deviation of $629
At a 0.025, can it be concluded that the mean is less
than $5400?
9. Heights of Tall Buildings A researcher estimates that
the average height of the buildings of 30 or more stories
in a large city is at least 700 feet. A random sample of
10 buildings is selected, and the heights in feet are shown.
At a 0.025, is there enough evidence to reject the claim?
485
511
841
725
615
520
535
635
616
582
Source: Pittsburgh Tribune-Review.
10. Number of Words ina Novel The National Novel
Writing Association states that the average novel is at
least 50,000 words. A particularly ambitious writing
help_outline

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franchise thinks that its cost is below that figure. A random sample of 28 patients across the country had an average cost of $5250 with a standard deviation of $629 At a 0.025, can it be concluded that the mean is less than $5400? 9. Heights of Tall Buildings A researcher estimates that the average height of the buildings of 30 or more stories in a large city is at least 700 feet. A random sample of 10 buildings is selected, and the heights in feet are shown. At a 0.025, is there enough evidence to reject the claim? 485 511 841 725 615 520 535 635 616 582 Source: Pittsburgh Tribune-Review. 10. Number of Words ina Novel The National Novel Writing Association states that the average novel is at least 50,000 words. A particularly ambitious writing

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Expert Answer

Step 1

Given data

485
511
841
725
615
520
535
635
616
582
Mean is given by
485 511 841 + .. +582
606. 5
10
Standard Deviation is given by
10
S=
п — 1
(485 - 606.5)2 (520 606.5)2
(582 - 606.5)2
109.0792
10 1
help_outline

Image Transcriptionclose

485 511 841 725 615 520 535 635 616 582 Mean is given by 485 511 841 + .. +582 606. 5 10 Standard Deviation is given by 10 S= п — 1 (485 - 606.5)2 (520 606.5)2 (582 - 606.5)2 109.0792 10 1

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Step 2

Formulation of Hypothesi...

Ho: u700
Ha:u<700
Sample size n 30 and population standard deviation is unknown, we will use
one sample t-test
Test Statistic
t
/п
606.5 700
t =
-2.710
109.0972
V10
help_outline

Image Transcriptionclose

Ho: u700 Ha:u<700 Sample size n 30 and population standard deviation is unknown, we will use one sample t-test Test Statistic t /п 606.5 700 t = -2.710 109.0972 V10

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Hypothesis Testing

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