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JulsSmile [24]
3 years ago
11

Please explain to me how to solve this!

Mathematics
1 answer:
lianna [129]3 years ago
3 0
What is there to solve?
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Suppose we take a random sample of 41 state college students. Then we measure the length of their right foot in centimeters. We
Debora [2.8K]

Answer:

ME = \frac{25.09-21.01}{2}= 1.69

The general formula for the margin of error is given by:

ME= t_{\alpha/2} \frac{s}{\sqrt{n}}

And for this case the width is:

Width= 2*t_{\alpha/2} \frac{s}{\sqrt{n}}

And if we decrease the confidence level from 95% to 90% then the critical value t_{\alpha/2} would decrease and in effect the width for this new confidence interval decreases.

As confidence level decreases, the interval width decreases

Step-by-step explanation:

For this cae we know that the sample size selected is n =41

And we have a confidence interva for the true mean of foot length for students at a college selected.

The confidence interval is given by this formula:

\bar X \pm t_{\alpha/2} \frac{s}{\sqrt{n}}

And for this case the 95% confidence interval is given by: (21.71,25.09)

A point of etimate for the true mean is given by:

\bar X = \frac{21.71+25.09}{2}= 23.4

And the margin of error would be:

ME = \frac{25.09-21.01}{2}= 1.69

The general formula for the margin of error is given by:

ME= t_{\alpha/2} \frac{s}{\sqrt{n}}

And for this case the width is:

Width= 2*t_{\alpha/2} \frac{s}{\sqrt{n}}

And if we decrease the confidence level from 95% to 90% then the critical value t_{\alpha/2} would decrease and in effect the width for this new confidence interval decreases.

As confidence level decreases, the interval width decreases

3 0
3 years ago
One week, Kerry travels 125 miles and uses 5 gallons of gasoline. The next week, she travels 175 miles and uses 7 gallons of gas
bazaltina [42]
This is good information, but the question part is missing. Put the question in the comments and I'll try my best to help!
6 0
2 years ago
Why might a researcher use a sample rather than an entire population for their study?
cestrela7 [59]

Answer:

c

Step-by-step explanation:

its easier to take a group of 100 or something random people than a whole population.

6 0
3 years ago
Which option best shows X ≤ -3
seraphim [82]

Step-by-step explanation:

the answer is b because the circle is filled with color as it should be and shows that x is equally to number 3 too

3 0
2 years ago
Read 2 more answers
HELP plz due by 9:00 pm 15 pts. brainliest has to do with ratios.. The polygons are similar. The area of one polygon is given. F
klasskru [66]

Answer:

Step-by-step explanation:

area of smaller triangle=96×(3/12)²=96×1/16=6cm²

8 0
3 years ago
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