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serg [7]
3 years ago
13

What is 20/4 - 8 please help

Mathematics
1 answer:
DanielleElmas [232]3 years ago
6 0
To subtract fractions, find the LCD and then combine.

Answer is: -3
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You have measured the systolic blood pressure of a random sample of 25 employees of a company located near you. A 95% confidence
Alla [95]

Answer:

122 \leq \mu \leq 138

The 95% confidence interval would be given by (122;138)

And the correct interpretation for this case is:

c. If the procedure were repeated many times, 95% of the resulting confidence intervals would contain the population mean systolic blood pressure.

Step-by-step explanation:

Previous concepts

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 % where by 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".  

Solution to the problem

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=25-1=24  

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(0.025,24)".And we see that t_{\alpha/2}=2.06  

Now we have everything in order to replace into formula (1), for this case we got:

122 \leq \mu \leq 138

The 95% confidence interval would be given by (122;138)

And the correct interpretation for this case is:

c. If the procedure were repeated many times, 95% of the resulting confidence intervals would contain the population mean systolic blood pressure.

6 0
3 years ago
Please someone help, give the right answer it’s important
Flura [38]

Answer:

2

Step-by-step explanation:

∠ MNQ = ∠ MNP + ∠ QNP

Since NP bisects ∠ MNQ , then

∠ MNP = ∠ QNP

3 0
2 years ago
Choose a point on the terminal side of theta theta= 5pi/4
adell [148]

Answer:    

Step-by-step explanation:

3 0
3 years ago
You are planning a survey of starting salaries for recent business major graduates from your college. From a pilot study you est
xxTIMURxx [149]

Answer:

1245

Step-by-step explanation:

-Given the standard deviation is $9000 and the margin of error is $500.

-the minimum sample size at a 95% confidence level can be calculated using the formula:

n\geq( \frac{z\sigma}{MOE})^2\\\\\\\geq (\frac{1.96\times 9000}{500})^2\\\\\\\geq 1244.6784\approx 1245

Hence, the minimum  sample size is 1245

*Since there's no data fromw which we are drawing our variables, we can manually input our parameters in excel and calculate as attached.

5 0
3 years ago
sam has 12 black and white photos and18 color photos.he wants to put the photos in equal rows so each row has either black and w
aalyn [17]
216 you multiply 12 by 18. Hope it helped!!!!!

5 0
3 years ago
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