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Snezhnost [94]
2 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]2 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]2 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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Name the ray rhat angle PQR and angle SQR share
lyudmila [28]
<span>Ray Q is the ray that angle PQR and SQR shares. Because both angles has the ray of Q.
ray refers to a line with one endpoint
P is a ray, Q is a ray, R is a ray and S is a ray. When you put them together, they form angle.

Pls. see attachment for the presentation of the angle PQR and SQR and how they share ray Q</span>



7 0
3 years ago
QUESTION 1
GREYUIT [131]

Answer:

i dont know

Step-by-step explanation:

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7 0
3 years ago
Rewrite, using the distributive property 7(3z + 12) = [?]z + [|]​
luda_lava [24]

Answer:

21z+84

Step-by-step explanation.

7x3=21 then put the z at the end 21z.

7x12=84. Put it after the 21z. 21z+84

3 0
2 years ago
A rectangular turtle aquarium is 6 ft long by 4 ft wide. The aquarium is enlarged by increasing
My name is Ann [436]

Answer:

8ft x 6ft

Step-by-step explanation:

For this problem, we want to create measurements of length and width that double our current area.  First we need to find the current area.

C_Length = 6 ft

C_Width = 4 ft

C_Area = C_Length * C_Width

C_Area = 6 ft * 4 ft = 24 ft^2

Now we want our new area to be double the old area.

N_Area = 2C_Area

N_Area = 2 * 24 ft^2

N_Area = 48 ft^2

Now we simply need to find the increase in width and length, distributed equally, that will create the new area.

N_Area = (C_Length + x) * (C_Width + x)

Where x is the amount that each variable is increased by to create the new area.

Now we simply solve for x.

N_Area = (C_Length + x) * (C_Width + x)

48 = (6 + x) * (4 + x)

48 = 24 + 10x + x^2

0 = -24 + 10x + x^2

Now we can either apply the quadratic formula or attempt to factor using the constant break down method.

(x + 12) (x - 2) = 0

x = -12; x = 2

Note that we will choose x = 2 since the other option would require us to have negative material, which is impossible.

Now we can check to validate our answer by plugging in the value of x.

48 ?= (6 + 2) * (4 + 2)

48 ?= (8) * (6)

48 == 48

Thus, we have found the dimensions of the new aquarium, 8ft x 6ft.

Cheers.

6 0
3 years ago
How many different ways can you choose 3 frozen yogurt toppings from 20?
Katena32 [7]
The answer is 6840!!!!
4 0
3 years ago
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