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Minchanka [31]
3 years ago
15

Someone please help me!!​

Mathematics
1 answer:
LiRa [457]3 years ago
4 0

Answer:

no it is not

Step-by-step explanation:

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According to a​ study, 68​% of all males between the ages of 18 and 24 live at home. ​ (Unmarried college students living in a d
Marat540 [252]

Answer:

a) P(X≥143​)=0

b) This contradicts the study as getting a sample with this proportion is almost impossible (if the proportion of 68% is true).

Step-by-step explanation:

If we use the normal approximation to the binomial distribution we have the following parameters (mean and standard deviation):

\mu=np=0.68*206=140.1\\\\ \sigma=\sqrt{np(1-p)}=\sqrt{206*0.68*0.32}=\sqrt{44.8256}=6.7

Then, we can calculate the probability of X being equal or more than 143 using the z-score:

z=\dfrac{X-\mu}{\sigma/\sqrt{n}}=\dfrac{143-140.1}{6.7/\sqrt{206}}=\dfrac{2.9}{0.4668}=6.2124\\\\\\P(x\geq143)=P(z>6.2124)=0

This contradicts the study as getting a sample with this proportion is almost impossible (if the proportion of 68% is true).

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3 years ago
Does the residual plot indicate that a line is a good model for predicting the height of girls from their ages? Explain.
galben [10]
A plot of residuals (vertical deviations from the regression line) shows the errors or lack of fit, so it would indicate a good fit if the residuals are small, vs. over fit if they are large. Due to age related growth short pre teen, and a plateau after age 21, I would expect a linear regression would offer estimate age 5.5 years.
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3 years ago
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uysha [10]

Answer:

B1: -9, -3, and 10

B2: 5

Step-by-step explanation:

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2 years ago
GIVING OUT BRAINLIEST + 80 PTS , GO TO MY PROFLE AND ANSWER!
Arada [10]

Answer:

I will answer the Question

Step-by-step explanation:

5 0
2 years ago
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Sonji paid $25.00 for two scarves, which were different prices. When she got home she could not find the receipt. She
Nimfa-mama [501]
Let the less expensive scarf be x

expensive scarf = $3 + x

According To The Question,

x+x+$3=$25

2x+$3=25

2x=22

x=$11

expensive scarf = x + $3 = $11 + $3 = $14

HOPE THIS WILL HELP YOU
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3 years ago
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