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cluponka [151]
2 years ago
12

HELP Me please whoever knows this

Mathematics
1 answer:
vaieri [72.5K]2 years ago
4 0

Answer:

The area is 840

Step-by-step explanation:

A=B H=20*42=840

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A sample of students from an introductory psychology class were polled regarding the number of hours they spent studying for the
Anni [7]

Answer:

8.68,13.16

Step-by-step explanation:

Hint- First we have to calculate the mean and standard deviation of the sample and then applying formula for confidence interval we can get the values.

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Standard deviation of the sample is,

\sigma =\sqrt{\dfrac{\sum _{i=1}^{24}\left(x_i-10.92\right)^2}{24-1}}=5.6

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=\mu \pm Z\dfrac{\sigma}{\sqrt{n}}

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Z for 95% confidence interval is 1.96, and n is sample size which is 24.

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=10.92 \pm 1.96\cdot \dfrac{5.6}{\sqrt{24}}

=10.92 \pm 2.24

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Confidence interval is used to express the degree of uncertainty associated with a sample.

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5 0
3 years ago
Please help I need an answer
Studentka2010 [4]

Answer:

i cant  help without the graph

Step-by-step explanation:

Next time plz trytoshow the graph if you'd like me to answer

4 0
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