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Snezhnost [94]
3 years ago
12

Paul wants to compare whether the prices of tangerines in two supermarkets differ significantly. He has been noting down the dai

ly prices for the last few days and has found the difference in the sample means to be 20 cents. If the standard deviation of the distribution of the difference between sample means is 28 cents and we are testing the null hypothesis at the 95% confidence level, which statement is true?
Mathematics
2 answers:
horsena [70]3 years ago
7 0

Answer:

The difference between the two means is not significant at the 95% confidence level, so the alternative hypothesis must be rejected.


masha68 [24]3 years ago
6 0
We use the simple rules of statistics to accept the null hypothesis
68% of the data falls within 1 sd of the mean95% of the data falls within 2 sd of the mean 99% of the data falls within 3 sd of the mean
20 falls between the range of -56 to 56 (from the given 95% c.i.), hence we accept the null hypothesis; else, if the mean falls outside the range, we reject the null hypothesis. 
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Determine the type and number of solutions of 4x^2-5x+1=0.
Arlecino [84]
<span>4x² - 5x + 1 = 0
a = 4; b = - 5, c = 1
</span>Δ = b² - 4.a.c
Δ = (-5)² - 4.4.1
Δ = 25 - 16
Δ = 9
<span>
x = - b </span>± √Δ / 2.a
x =  \frac{-5\± \sqrt{9} }{2*4}
x =  \frac{-5\±3}{8}
x' =  \frac{-5-3}{8} =  \frac{-8}{8} = -1
x' = \frac{-5+3}{8} = \frac{-2}{8} (\div2) = \frac{-1}{4}


A. Two real solutions (x' = -1 and x'' = -1/4)
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3 years ago
Last night, the two dinner specials at Henry's favorite restaurant were salmon filet and steak. The restaurant served 55 special
sergeinik [125]
Since 11 out of 55 specials were salmon filet,

The percentage of specials that were salmon filet is 11/55 = 20/100 = 20%.
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3 years ago
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Point A is located at (1,5), and point M is located at (-1, 6). If point M is the midpoint of AB, find the
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Answer:

-3, 7

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7 0
3 years ago
Bodmas 6x (3+8) -8x(6-2)​
Leona [35]
If your looking for the answer then it’s 34
4 0
3 years ago
Somebody please help me out!
dmitriy555 [2]
Since the triangles are similar, all sides are proportional by the same scale factor.
The relationship between the bases 32 and 8 is 4 (32/8 = 4). This means that the smaller triangle need to be multiplied by a scale factor 4 to result in the bigger triangle.
This means that 4x + 12 is 4 times greater than 15.
The equation to solve for x can be written as:
4x + 12 = 4*15
Now just solve for x as u normally would
4x + 12 = 60
(Subtract twelve from both sides)
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(Divide both sides by 4 to isolate x)
x = 12

I hope this somewhat helped :)
Was my explanation clear enough?
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3 years ago
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