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tangare [24]
3 years ago
12

Cindy is studying cognitive development during adulthood. She administers several memory and problem-solving tasks to a group of

20-year-olds, a group of 40-year-olds, and a group of 70-year-olds. Cindy is using a _____ research design.
1. cross-sequential
2. cross-sectional
3. simultaneous
4. longitudinal
Mathematics
1 answer:
kirza4 [7]3 years ago
6 0

Answer:

2. Cross- Sectional

Step-by-step explanation:

Cross-sectional research involves using different groups of people who differ in the variable of interest but share other characteristics, such as socioeconomic status, educational background, and ethnicity.

Cross sectional design research design involves looking at a data from a population at one specific point in time. Cross-sectional studies are used to describe what is happening at the present moment. Analysis of cross sectional data usually consists of comparing the differences among selected subjects.

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Use expanded form or number name to complete the definition.
Evgen [1.6K]
Can you take a picture of the problem
7 0
3 years ago
Mrs. Smith has only 52.50 to spend at Old Navy. She wants to buy a shirt for Max that costs $39, including tax, and some socks t
Fynjy0 [20]

Answer:

3

Step-by-step explanation:

Let's find how much money is left if Mrs.Smith buys a shirt.

52.50 - 39 = 13.50

13.50/4.50 = s

s = 3

Hope this helps :)

6 0
3 years ago
Use Euler’s method to estimate the value of y(20). Use a step size of ∆x = 5. Please fill out the remainder of the chart complet
crimeas [40]

Answer:

y(20)=14,322

Step-by-step explanation:

We need to solve the equation:

dy/dx=0.4xy

with initial point

y(0) = 2

with incerments

\Delta x=h=5

By Euler's method, we have:

y(x+h)=y(x)+h*f'(x,y)

We start with the initial point

y(5)=y(0)+5*f'(0,2)=2+5*(0.4*0*2)=2

And we continue until we reach the value for y(20)

y(10)=y(5)+5*f'(5,2)=2+5*(0.4*5*2)=2+20=22\\\\\\y(15)=y(10)+5*f'(10,22)=22+5*(0.4*10*22)=22+440=462\\\\\\y(20)=y(15)+5*f'(15,462)=462+5*(0.4*15*462)=462+13,860\\\\y(20)=14,322

4 0
3 years ago
Write a real-world problem that could be represented by the inequality.<br> 3x + 6 &gt; 27
liubo4ka [24]
Hello! We see that 6 is the fixed amount. x represents the amount of something, and the solution makes a number $27. Let's make a real-world problem and then execute it.

Fawn has $6 in her piggy bank. She makes bracelets to sell to family & friends for $3 each. She wants to buy a video game that with tax, costs a little over $27. How many bracelets would Fawn have to sell in order to have enough money to buy the video game?

How to solve it:

So we have the expression of 3x + 6 > 27. First off, subtract 6 from both sides. 6 - 6 cancels out. 27 - 6 is 21. That's 3x > 21. Now, divide each side by 3 to isolate the x. 3x/3 cancels out. 21/3 is 7. There. x > 7. Fawn will have to sell more than 7 bracelets in order to have enough money for the game.
8 0
3 years ago
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Korvikt [17]
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6 0
3 years ago
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