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Simora [160]
3 years ago
5

Can someone help me??

Mathematics
1 answer:
natta225 [31]3 years ago
4 0
0.12 x 0.1 = 0.012  I think
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In a study of academic procrastination, the authors of a paper reported that for a sample of 471 undergraduate students at a mid
AnnZ [28]

Answer:

95% confidence interval for the mean time spent studying for the final exam for students taking introductory psychology at this university is [6.85 hours, 7.43 hours].

Step-by-step explanation:

We are given that a sample of 471 undergraduate students at a midsize public university preparing for a final exam in an introductory psychology course, the mean time spent studying for the exam was 7.14 hours and the standard deviation of study times was 3.20 hours.

Firstly, the pivotal quantity for 95% confidence interval for the  population mean is given by;

                         P.Q. = \frac{\bar X-\mu}{\frac{\sigma}{\sqrt{n} } }  ~ N(0,1)

where, \bar X = sample mean time spent studying for the exam = 7.14 hours

            \sigma = population standard deviation = 3.20 minutes

            n = sample of undergraduate students = 471

            \mu = population mean time

<em>Here for constructing 95% confidence interval we have used One-sample z test statistics.</em>

<u>So, 95% confidence interval for the population mean, </u>\mu<u> is ;</u>

P(-1.96 < N(0,1) < 1.96) = 0.95  {As the critical value of z at 2.5% level

                                              of significance are -1.96 & 1.96}  

P(-1.96 < \frac{\bar X-\mu}{\frac{\sigma}{\sqrt{n} } } < 1.96) = 0.95

P( -1.96 \times {\frac{\sigma}{\sqrt{n} } } < {\bar X-\mu} < 1.96 \times {\frac{\sigma}{\sqrt{n} } } ) = 0.95

P( \bar X-1.96 \times {\frac{\sigma}{\sqrt{n} } } < \mu < \bar X+1.96 \times {\frac{\sigma}{\sqrt{n} } } ) = 0.95

<u>95% confidence interval for</u> \mu = [ \bar X-1.96 \times {\frac{\sigma}{\sqrt{n} } } , \bar X+1.96 \times {\frac{\sigma}{\sqrt{n} } } ]

   = [ 7.14-1.96 \times {\frac{3.20}{\sqrt{471} } } , 7.14+1.96 \times {\frac{3.20}{\sqrt{471} } } ]

   = [6.85 hours , 7.43 hours]

Therefore, 95% confidence interval for the mean time spent studying for the final exam for students taking introductory psychology at this university is [6.85 hours, 7.43 hours].

7 0
3 years ago
A family has a monthly income of ​$3912. Their monthly expenditures are as shown in the graph below.
stealth61 [152]

Answer: The save $1134.48

Step-by-step explanation:

3912 x 0.29 = 1134.48

5 0
1 year ago
Is - 735,200-702 positive or negative
kkurt [141]

Answer:

negative i believe

Step-by-step explanation:

If you are subtracting -735,200 by -702 then yes it is negative but if you are multiplying them then its a positive

8 0
3 years ago
Read 2 more answers
WILL MARK BRAINLIEST
Debora [2.8K]

460 < 2x + 10 and 2x + 10 < 660

Solve x in each equation:

Rewrite so X is on the left side:

2x +10 >460

Subtract 10 from each side:

2x > 450

Divide both sides by 2:

x > 450 /2

x > 225

2x +10 <660

Subtract 10 from both sides:

2x < 650

Divide both sides by 2:

x < 650 / 2

x < 325

Combine the answer: 225 < x < 325

This means her carb intake needs to be more than 225 and less than 325 grams.

7 0
3 years ago
Read 2 more answers
A website offers video game downloads for $5 each. customers can also subscribe for us
Nikitich [7]

Answer:

Here is the answer

Step-by-step explanation:

Btw brainliest me plss

8 0
3 years ago
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