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stepan [7]
2 years ago
10

Elena's backyard is in the shape of a rectangle. She created a triangular-shaped flower bed (shown as the shaded region) to plan

t flowers in.
20 feet
10 feet
25 foot
35 feet
The area of the triangular flower bed is
square
square feet. The area of her backyard that does not include the flower bed is
feet

Mathematics
1 answer:
Scorpion4ik [409]2 years ago
8 0
25 feet I don’t know hard problem sorry 24hhk
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A research group wants to know if the online platform to play Settlers of Catan is being accessed more after the stay at home or
Gre4nikov [31]

Answer:

a) The P-value is 0.

At a significance level of 0.05, there is enough evidence to support the claim that the online platform was accessed significantly more so than before the stay at home order.

b) Effect size d = 0.77

Medium.

Step-by-step explanation:

This is a hypothesis test for the population mean.

The claim is that the online platform was accessed significantly more so than before the stay at home order.

Then, the null and alternative hypothesis are:

H_0: \mu=1000\\\\H_a:\mu> 1000

The significance level is 0.05.

The sample has a size n=108000.

The sample mean is M=1378.

As the standard deviation of the population is not known, we estimate it with the sample standard deviation, that has a value of s=489.

The estimated standard error of the mean is computed using the formula:

s_M=\dfrac{s}{\sqrt{n}}=\dfrac{489}{\sqrt{108000}}=1.488

Then, we can calculate the t-statistic as:

t=\dfrac{M-\mu}{s/\sqrt{n}}=\dfrac{1378-1000}{1.488}=\dfrac{378}{1.488}=254.036

The degrees of freedom for this sample size are:

df=n-1=108000-1=107999

This test is a right-tailed test, with 107999 degrees of freedom and t=254.036, so the P-value for this test is calculated as (using a t-table):

\text{P-value}=P(t>254.036)=0

As the P-value (0) is smaller than the significance level (0.05), the effect is significant.

The null hypothesis is rejected.

At a significance level of 0.05, there is enough evidence to support the claim that the online platform was accessed significantly more so than before the stay at home order.

The effect size can be estimated with the Cohen's d.

This can be calculated as:

d=\dfrac{M-\mu}{\sigma}=\dfrac{1378-1000}{489}=\dfrac{378}{489}=0.77

The values of Cohen's d between 0.2 and 0.8 are considered "Medium", so in this case, the effect size d=0.77 is medium.

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3 years ago
How can you check to see if two fractions are equivalent please explain
Wewaii [24]

Answer:

cross multiply and they should equal the same

Step-by-step explanation:

4 0
3 years ago
Need help on this please
alexandr402 [8]

Answer:

5.7

Step-by-step explanation:

7^2- 4^2= 33

\sqrt{33}= 5.7

7 0
2 years ago
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Cherries cost 4 dollars per pound. Mother bought r lbs and father bought 2 lbs. How much more money did mother spend on cherries
vazorg [7]

T=  the total cost

T=4r+2

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3 years ago
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Last month Ed ate 9 apples five bananas 4 peaches and 7 oranges find the Ratio of bananas to the total number of fruit then expl
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The ratio is 5:4:7:9. The reason why they didn't write it together is that the  bananas are written in different form.
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