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abruzzese [7]
2 years ago
8

Round of the underlined digit in each day decimal number​

Mathematics
2 answers:
Sveta_85 [38]2 years ago
5 0

Step-by-step explanation:

ID = 801 720 6270

Pas = 1234

Jôîn frm zøôm app

NARA [144]2 years ago
3 0

Answer:

6) 25.57

7) .9

8) don't see a number underlined

Step-by-step explanation:

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The authors of a paper describe an experiment to evaluate the effect of using a cell phone on reaction time. Subjects were asked
Serggg [28]

Answer:

a) The 99% confidence interval would be given by (24.409;24.979)  

b) n=464

Step-by-step explanation:

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".  

The margin of error is the range of values below and above the sample statistic in a confidence interval.  

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".  

Part a

The confidence interval for the mean is given by the following formula:  

\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}} (1)  

In order to calculate the critical value t_{\alpha/2} we need to find first the degrees of freedom, given by:  

df=n-1=47-1=46  

Since the Confidence is 0.95 or 95%, the value of \alpha=0.05 and \alpha/2 =0.025, and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=-T.INV(0.025,46)".And we see that t_{\alpha/2}=2.01  

Now we have everything in order to replace into formula (1):  

525-2.01\frac{75}{\sqrt{47}}=503.01  

525+2.01\frac{75}{\sqrt{47}}=546.99  

So on this case the 95% confidence interval would be given by (503.01;546.99)

Part b

The margin of error is given by this formula:  

ME=t_{\alpha/2}\frac{s}{\sqrt{n}} (1)  

And on this case we have that ME =7 msec, we are interested in order to find the value of n, if we solve n from equation (1) we got:  

n=(\frac{t_{\alpha/2} s}{ME})^2 (2)  

The critical value for 95% of confidence interval is provided, t_{\alpha/2}=2.01 from part a, replacing into formula (2) we got:  

n=(\frac{2.01(75)}{7})^2 =463.79 \approx 464  

So the answer for this case would be n=464 rounded up to the nearest integer  

8 0
3 years ago
Cory just started his first job and does not have much money saved. Each month he needs to pay his rent and make payments on his
LenKa [72]
Given that Cory does not have much money saved he will be using her regular incomes to pay his rent and car, so the most appropiate bank account is a checking account.

That will let him to deposit his incomes and make the payments with checks.

It does not make sense opening an account that pays interests because the money will be spent promptly.

Answer: option a. checking account.
8 0
4 years ago
How many artists could be featured in the show?
EleoNora [17]
Well we're just looking at oil paintings so let's say each shows 2 paintings...

30/2 = 15

so at most- 15 artists
7 0
3 years ago
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What would make this a parallelogram
Helen [10]
All 4 sides are parrell
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3 years ago
Please helppppppppp meeeeee
AfilCa [17]

Answer:

65 degrees

Step-by-step explanation:

115-180

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