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Liono4ka [1.6K]
1 year ago
5

A team of dermatological researchers were studying skin cancer among 60-70 year old American men. Suppose you were a part of the

research team and take a sample of n =70 men from this age group and calculate the mean number of skin cancer spots in the sample. Also suppose that it is known that the distribution of the number of cancer spots is right-skewed.1. How is the standard deviation of the distribution of sample means related to the population standard deviation of the number of cancer spots?a. The standard deviation of the distribution of sample means is less than the population standard deviation of the number of cancer spots.b. The standard deviation of the distribution of sample means is equal to the population standard deviation of the number of cancer spots.c. The standard deviation of the distribution of sample means is greater than the population standard deviation of the number of cancer spots.
d. We cannot be sure of any of the above answers until we examine the data.
Mathematics
1 answer:
Lostsunrise [7]1 year ago
3 0

Answer:

The correct answer is Option A.) The standard deviation of the distribution of sample means is less than the population standard deviation of the number of cancer spots.

Step-by-step explanation:

The standard deviation of the distribution of sample means is less than the population standard deviation of the number of cancer spots.

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Elliott has some yarn that she wants to use to make hats and scarves. Each hat uses 0.2 kilograms of yarn and
erastova [34]

Answer:

The equation are:

1) h + s = 20

2) 4h = 1s

Step-by-step explanation:

Number of hats Elliott made = h

Number of scarfs Elliott made = s

total number of items Elliott made = 20

h + s = 20 ..[1]

1 hat uses 0.2 kilograms of yarn

1 hat = 0.2 kg of yarn

Then h hats will use = 0.2h kg of yarn

1 scarf uses 0.1 kilograms of yarn

1 scarf= 0.1 kg of yarn

Then s scarfs will use = 0.1s kg of yarn

She wants to twice as much as yarn for scarves for hats:

2 × (0.2h kg of yarn) = 0.1s kg of yarn

0.4h = 0.1s

4h = 1s...[2]

The equation are:

1) h + s = 20

2) 4h = 1s

8 0
1 year ago
Read 2 more answers
How many units of a 10% solution are needed to prepare 500 units of a 2% solution?
Akimi4 [234]
First find how many units of solution there is:

500* 2% = 500(.02) = 10 units

You need 10 units of solution in 'x' units of a 10% solution.

x*10% = 0.1x = 10 units   ----->  x = 10/0.1 = 100

100 units are needed
8 0
2 years ago
Which statements are true about the location of 3.28 on the number line? Check all that apply. A number line from 1.2 to 4.2. 3.
Juliette [100K]

Answer:

- 3.28 should be plotted between 3.2 and 3.4

- 3.28 is closer to 3.0 than 4.0.

- 3.28 is closer to 3.2 than 3.4.

Step-by-step explanation:

3.28 is located towards the positive side of the number line being a positive value. Since the value is located between 3.2 and 3.4, therefore it can be plotted between this two points.

Also 3.28 is known to be closer to 3.0 than 4.0 because the difference between 3.28 and 3.0 is lower than the difference between 3.28 and 4.

4-3.28 = 0.72(larger value)

3.28-3.0 = 0.28 (smaller value)

The smaller the difference, the closer the value of 3.28 to the value in consideration.

Similarly, 3.28 is closer to 3.2 than 3.4, due to their differences. The difference between 3.28 and 3.2 is lower than the difference between 3.28 and 3.4 as shown:

3.28 - 3.2 = 0.08(smaller)

3.4-3.28 = 0.12(larger)

8 0
1 year ago
Calculate the equation of the line if two points are (1,6) and (5,0) Hint, you will have to find the slope of the line and then
motikmotik

Answer:

The equation is y=\frac{-3}{2} x-9

Step-by-step explanation:

First, you will have to find the slope of the two points.To do that, you will have to use the formula : m=\frac{y_{2}-y_{1}  }{x_{2} -x_{1} }

Our points are (1,6) and (5,0)

We will have to substitute the points into the formula.

m=\frac{0-6}{5-1}

Then, we will simplify

m= \frac{-6}{4}

We could simplify that fraction into \frac{-3}{2}

So, our slope is \frac{-3}{2}

We will have to pick a coordinate point, and choose. I chose (1,6)

We will substitute the x-value and the y-value of the coordinate point, including our slope, to calculate the y-intercept.

The formula we will be using is y=mx+b

We will substitute in our values which will make it look like:

6=\frac{-3}{2} (1)+b

We will then multiply \frac{-3}{2} by 1 which will stay the same.

Then, we will multiply \frac{-3}{2} by 6 which will equal -9

-9=b

Hence, the equation for our line is y=\frac{-3}{2} x-9

Hope it helped:D

<u><em>-Jazz</em></u>

5 0
1 year ago
In the graph, the area below f(x) is shaded and labeled A, the area below g(x) is shaded and labeled B, and the area where f(x)
Verdich [7]
B

Hope fully this helps!!
4 0
1 year ago
Read 2 more answers
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