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Mrrafil [7]
3 years ago
5

Solve please I don’t know how to do this.

Mathematics
2 answers:
nadya68 [22]3 years ago
8 0

Answer:

n=40

Step-by-step explanation:

Solnce55 [7]3 years ago
5 0

Answer:

Step-by-step explanation:

15 = 3/8 n

n = 8/3 * 15

n = 40

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The heights (in inches) and pulse rates (in beats per minute) for a sample of 40 women were measured. Using technology with the
Viktor [21]

Answer:

There is not sufficient evidence  to support the claim that there is a linear correlation between the heights and pulse rates of women

Step-by-step explanation:

The correlation coefficient between the variables h(height in inches) and pulse rates (in beats per minute) is 0.202

Sample size n=40

Level of significane alpha = 0.01

Create null and alternate hypothesis as:

H0: r=0

Ha: r not equal 0

(Two tailed test at 1% significance level)

Sample r = 0.202

r difference = 0.202

test statistic t = \frac{r\sqrt{n-2} }{\sqrt{1-r^2} } \\=\frac{0.202(\sqrt{38} )}{\sqrt{0.9592} } \\=\frac{1.25}{0.9794} \\=1.271

df =n-2 =38

t critical value for 0.01 and df =38 is 2.704

Since our test statistic lies below 2.704, we accept null hypothesis

There is not sufficient evidence  to support the claim that there is a linear correlation between the heights and pulse rates of women

7 0
3 years ago
Help me please again
SashulF [63]
The answer is C.
x=2
y=-30
(2;-30)
7 0
3 years ago
In figure is shown a right circular cone of height 30 cm. A small cone is cut off from the top by a plane parallel to the base.
olga2289 [7]

Answer:

20 cm

Step-by-step explanation:

Think of a large cone, 30 cm high, and a small cone of x height.

The scale factor of a volume of the cube of the scale factor of linear dimensions.

The cubic root of 1/27 is 1/3.

This means that the height of the small cone is 1/3 the height of the large cone.

The large cone has height 30 cm.

The small cone has height 10 cm.

30 cm - 10 cm = 20 cm

Answer: 20 cm

7 0
2 years ago
The lines graphed below are perpendicular. The slope of the red line is 4. What is the slope of the green line?
Mashutka [201]
-1/4 the negative reciprocal of the slope of the red line
6 0
3 years ago
For every $50.00. Michael earns, he saves $5. for the future. How much money will he have saved when he earns a total of $500.
xeze [42]

The answer is D

This is because if for every $50 he saves $5, and he has saved a total of $500, you can set up a proportion to find out how much money he has saved at that point.

The proportion is as follows:

50/5 == 500/x

x is equivalent to the amount of money he has saved

You can cross multiply to get the following equation:

50x == 2500

To isolate x, you must divide both sides by 50, giving you an answer of:

x = 50

This is the same as option D

4 0
3 years ago
Read 2 more answers
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