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Natasha2012 [34]
3 years ago
11

PLZ HELP NEED ANSWER NOW. school administrator believes that the mean class GPAs for a given course are higher than the preferre

d mean of 2.75 at a significance level of 0.05, and checks a randomly chosen sample of 50 classes. Create a histogram, and calculate x, the t-statistic, and the p-value.
2.59
2.43
2.96
2.80
2.94
3.07
2.65
2.79
2.61
2.90
3.14
2.78
2.50
2.78
2.52
2.60
2.86
2.88
2.78
3.09
2.82
2.72
2.98
2.68
2.87
2.86
2.78
2.73
2.62
2.77
2.90
3.02
2.73
2.87
2.63
2.98
2.52
2.81
2.91
2.71
3.07
2.89
2.93
2.64
2.94
2.81
2.85
2.89
2.79
2.86
Mathematics
1 answer:
Fudgin [204]3 years ago
5 0

Answer:

i do not know because i am a 4rth grader

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A counselor records the number of disagreements (per session) among couples during group counseling sessions. If the number of d
Shalnov [3]

Answer:

P(X>4)=P(\frac{X-\mu}{\sigma}>\frac{4-\mu}{\sigma})=P(Z>\frac{4-4.4}{0.4})=P(z>-1)

And we can find this probability with the complement rule:

P(z>-1)=1-P(z

Step-by-step explanation:

Previous concepts

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

The Z-score is "a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean".  

Solution to the problem

Let X the random variable that represent the disagreements of a population, and for this case we know the distribution for X is given by:

X \sim N(4.4,0.4)  

Where \mu=4.4 and \sigma=0.4

We are interested on this probability

P(X>4)

And the best way to solve this problem is using the normal standard distribution and the z score given by:

z=\frac{x-\mu}{\sigma}

If we apply this formula to our probability we got this:

P(X>4)=P(\frac{X-\mu}{\sigma}>\frac{4-\mu}{\sigma})=P(Z>\frac{4-4.4}{0.4})=P(z>-1)

And we can find this probability with the complement rule:

P(z>-1)=1-P(z

3 0
3 years ago
What is the distance between (-5, 5) and (1, -2)
Murrr4er [49]

Answer:

\displaystyle d=\sqrt{85}\text{, or about 9.22 units}

Step-by-step explanation:

          We will use the distance formula to solve.

\displaystyle d=\sqrt{(x_{2}-x_{1})^2 +(y_{2}-y_{1})^2}

\displaystyle d=\sqrt{(1--5)^2 +(-2-5)^2}

\displaystyle d=\sqrt{(6)^2 +(-7)^2}

\displaystyle d=\sqrt{36+49}

\displaystyle d=\sqrt{85}\text{, or about 9.22 units}

<em>Read more about using the </em><em>distance formula</em><em> here: brainly.com/question/15691280</em>

6 0
1 year ago
Hello da 234234r32 ef3qew3e2wr3qefwasdwasd
scoray [572]
Ah, thank you. your question truly made the most of sense.
3 0
2 years ago
A woman bought 210 oranges for 650 she sold all of them at 3 for 20 how much profit did
inna [77]

Answer:

750

Step-by-step explanation:

total cost = 650

total selling = 210/3 x 20 = 70 x 20 = 1400

total profit = 1400 - 650 = 750

8 0
2 years ago
You run one lap around a mile track every 8 minutes. Your friend runs around the same track every 10 minutes. You both start at
dolphi86 [110]
I'm going to need more information before I can answer.
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