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olasank [31]
2 years ago
5

Question 7

Mathematics
1 answer:
Readme [11.4K]2 years ago
6 0

Answer:A

Step-by-step explanation: 6 divided by 420 = 70

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Results from previous studies showed 79% of all high school seniors from a certain city plan to attend college after graduation.
alisha [4.7K]
<h2>Answer with explanation:</h2>

Let p be the population proportion.

Then, Null hypothesis : H_0 : p=0.79

Alternative hypothesis : H_a : p>0.79

Since the alternative hypothesis is right tailed , then the hypothesis test is a right tailed test.

Given :  A random sample of 200 high school seniors from this city reveals that 162 plan to attend college.

i.e. n = 200 > 30 , so we use z-test (otherwise we use t-test.)

\hat{p}=\dfrac{162}{200}=0.81

Test statistic for population proportion :

z=\dfrac{\hat{p}-p}{\sqrt{\dfrac{\hat{p}(1-\hat{p})}{n}}}

=\dfrac{0.81-0.79}{\sqrt{\dfrac{0.81(1-0.81)}{200}}}=0.720984093915\approx0.72

Thus, the z-value of the sample test-statistic = 0.72

P-value for right tailed test =P(z>0.72)=1-P(\leq0.72)

=1-0.7642375=0.2357625\approx0.2358

Since the p-value is greater than the significance level (0.05) , so we fail to reject the null hypothesis.

Hence, we conclude that we do not have sufficient evidence to support the claim that the percentage has increased from that of previous studies.

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3 years ago
Megan has three and 2/3 NERDS ropes to split into 1/5 length pieces. If she shares these pieces with as many friends as possible
makkiz [27]
18 friends would get 1/5 of a rope
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2 years ago
-3 7/10 divided by 2 1/4<br><br> Please simplify the answer.
soldier1979 [14.2K]
-3.7 divided by 2.25 = about -1.64
Could I have a brainliest please? It would be greatly appreciated =D
6 0
3 years ago
Can someone please help me
mars1129 [50]

Answer:

I think the answer is b

Step-by-step explanation:

7 0
2 years ago
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Solve for x:<br> Solve for x:
Delicious77 [7]

Answer: x = 8

Step-by-step explanation: 8x +36 = 5x + 60

                                               8x - 5x = 60-36

                                                3x = 24

                                                   x = 24/3

                                                  x = 8

plz mark as Brainliest

8 0
3 years ago
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