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jok3333 [9.3K]
3 years ago
13

I need help with numbers 7,8

Mathematics
1 answer:
meriva3 years ago
8 0

Answer:

7.) the angle is an acute

8.) the angle is an obtuse

Step-by-step explanation:

an acute is an angle lower than 90°

an obtuse is an angle greater than 90°

hope i helped :)

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A survey of 1,562 randomly selected adults showed that 522 of them have heard of a new electronic reader. The accompanying techn
tester [92]

Answer:

a) We want to test the claim that 35​% of adults have heard of the new electronic reader, then the system of hypothesis are.:  

Null hypothesis:p=0.35  

Alternative hypothesis:p \neq 0.35  

And is a two tailed test

b) z=\frac{0.334 -0.35}{\sqrt{\frac{0.35(1-0.35)}{1562}}}=-1.326  

c) p_v =2*P(z  

d) Null hypothesis:p=0.35  

e) Fail to reject the null hypothesis because the P-value is greater than the significance level, alpha.

Step-by-step explanation:

Information provided

n=1562 represent the random sample selected

X=522 represent the people who have heard of a new electronic reader

\hat p=\frac{522}{1562}=0.334 estimated proportion of people who have heard of a new electronic reader

p_o=0.35 is the value to verify

\alpha=0.05 represent the significance level

z would represent the statistic

p_v represent the p value

Part a

We want to test the claim that 35​% of adults have heard of the new electronic reader, then the system of hypothesis are.:  

Null hypothesis:p=0.35  

Alternative hypothesis:p \neq 0.35  

And is a two tailed test

Part b

The statistic for this case is given :

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

Replacing the info given we got:

z=\frac{0.334 -0.35}{\sqrt{\frac{0.35(1-0.35)}{1562}}}=-1.326  

Part c

We can calculate the p value using the laternative hypothesis with the following probability:

p_v =2*P(z  

Part d

The null hypothesis for this case would be:

Null hypothesis:p=0.35  

Part e

The best conclusion for this case would be:

Fail to reject the null hypothesis because the P-value is greater than the significance level, alpha.

5 0
3 years ago
Find the seling price of a $450 painting with a 45% markup
LiRa [457]

<span>450/100=x/145. Cross multiply to get 100x=65250. Divide by 100 to get 652.50. The selling price of the painting is $652.50. Brainlest?</span>
6 0
3 years ago
800 is 60% of what number?​
spin [16.1K]

Answer:

1,333.333333333333

60 percent (calculated percentage %) of what number equals 800? Answer: 1,333.333333333333.

Step-by-step explanation:

7 0
2 years ago
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Divide £32 in a ratio of 3:7
lord [1]
3 + 7 = 10

32 ÷ 10 = 3.2

3.2 × 3 = 9.6

3.2 × 7 = 22.4

£9.60 : £22.40
3 0
2 years ago
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Find the 20th term of the arithmetic sequence 15,9,3,-3
kati45 [8]

Answer:

-99

Step-by-step explanation:

a = 15 \\ d =  - 6 \\  {n}^{th} term = a + (n + 1)d  = 15 + (n - 1)( - 6) \\  {20}^{th} term =15 + (20 - 1)( - 6) = 15 - 114 =  - 99

3 0
2 years ago
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