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4 years ago

How do I find the anwser.How do I solve

Mathematics

1 answer:

Whitepunk [10]4 years ago

8 0

Answer:

Could you give more info so I can try and sole it?

Step-by-step explanation:

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Taking a test i don’t know anything about please help

PilotLPTM [1.2K]

Answer:

See below for answers and explanations

Step-by-step explanation:

Problem 4:

The line of regression is $\hat y = a+bx$ where:

$a=\overline y-b \overline x$

$b=\frac{r*s_y}{s_x}$

We are given that $\overline y=75$ , $s_y=8$ , $\overline x=280$ , $s_x=30$ , and $r=0.60$ , therefore our slope, $b$ , is:

$b=\frac{r*s_y}{s_x}$

$b=\frac{(0.60)(8)}{30}$

$b=0.16$

Therefore, the slope of the regression line is 0.16, which can be used along with the values of $\overline y$ and $\overline x$ to find the constant $a$ :

$a=\overline y-b \overline x$

$a=75-(0.16)(280)$

$a=30.2$

This means our final regression line is $\hat y = 30.2 + 0.16x$

Problem 5:

The slope, $b=0.16$ , means that for every 1 point earned for a student's pre-exam total, their final exam score will increase by 0.16 points for each point they earned on the pre-exam.

Problem 6:

The y-intercept (or constant), $a=30.2$ , means that if a student's pre-exam total were 0, then they would expect to get a 30.2 on the final exam.

Problem 7:

$R^{2}=(0.60)^{2}=0.36=36\%$

Problem 8:

The fraction of variability (aka. coefficient of determination), $R^2$ , means that a certain proportion (or percentage) of the variance in the response variable can be explained by the explanatory variable. In context, this means that 36% of the variance in final exam scores can be explained by the pre-exam scores.

6 0

3 years ago

Please help me with this

juin [17]

Answer:

x=30, <A=60, <C=30

Step-by-step explanation:

A triangle always has its total angles added up to 180 degrees, so we can set up the following equation:

90+2x+x=180

90+3x=180

3x=90

x=30

Since x=30, this means <C is 30 degrees. For <A, it's twice as much as <C, so 2*30=60.

So x=30, <A=60, <C=30

Hope this helped!

8 0

3 years ago

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Need help ASAP please and thank you

Helen [10]

Answer:

Step-by-step explanation:

4 is the outlier

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4 years ago

What is the correct comparison between the numbers? 0?0.64 0.50?0.64 1?0.64

Vikentia [17]

What is the question as I think those are answer choices?

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4 years ago

A researcher uses an anonymous survey to investigate the study habits of American college students. Based on the set of 56 surve

tresset_1 [31]

Answer:

Statistic

Step-by-step explanation:

A statistic is any quantity computed from values in a sample. Some examples of statistics are: sample mean (also called average, like in this case), sample median, sample mode, sample standard deviation, sample quartiles and sample percentiles.

8 0

3 years ago