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alexdok [17]
3 years ago
11

b) How many white-winged cross bills will there be at the end of June 2020? (Remember that t represent

Mathematics
1 answer:
Mandarinka [93]3 years ago
4 0

Answer:

A dozen = 12

Step-by-step explanation:

I think I’m right

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Maya drew a scale drawing of her room where 1.5 cm represented 4 ft. If the room was actually 16 ft by 12 ft what were the dimen
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If 1.5cm = 4ft

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The International Air Transport Association surveys business travelers to develop quality ratings for transatlantic gateway airp
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Answer:

6.76-2.01\frac{2.55}{\sqrt{50}}=6.03    

6.76+2.01\frac{2.55}{\sqrt{50}}=7.49    

The 95% confidence interval would be given by (6.03;7.49)    

Step-by-step explanation:

Notation

\bar X represent the sample mean

\mu population mean (variable of interest)

s represent the sample standard deviation

n=50 represent the sample size  

Solution

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

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

We can calculate the mean and the sample deviation we can use the following formulas:  

\bar X= \sum_{i=1}^n \frac{x_i}{n} (2)  

s=\sqrt{\frac{\sum_{i=1}^n (x_i-\bar X)}{n-1}} (3)  

The mean calculated for this case is \bar X=6.76

The sample deviation calculated s=2.55

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

df=n-1=50-1=49

We assume a standard confidence level of 0.95 or 95%, the value of \alpha=0.05 and \alpha/2 =0.025, and we can use excel, a calculator or a tabel to find the critical value. The excel command would be: "=-T.INV(0.025,49)".And we see that t_{\alpha/2}=2.01

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

6.76-2.01\frac{2.55}{\sqrt{50}}=6.03    

6.76+2.01\frac{2.55}{\sqrt{50}}=7.49    

The 95% confidence interval would be given by (6.03;7.49)    

3 0
3 years ago
28
Marrrta [24]

Answer:

I believe that the answer is 2x-8

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3 years ago
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