a researcher is studying the effects of playing chess on memory improvement. he identifies 50 people who play chess and 50 people who do not. each of the 100 people is given a questionnaire designed to determine memory level. none of the 100 people who participated in the study knew they were part of a study. which statement is true.

Answers

Answer 1

Answer:

Observational study

Step-by-step explanation:

Just took the test


Related Questions

Help!! I’ll mark you brainliest!!!!!
Doors for the small cabinets are 18.5 inches long. Doors for the large cabinets are 2.7 times as long as the doors for the small cabinets. How many large doors can be cut from a board that said 10 feet long?

Answers

2 because if big doors are 4.16 feet long it would be 8.32 for 2 doors and it would be more than ten feet otherwise so 2 doors

The ratio of boys to girls in Mr. Woods class is 5:7.

If there are 60 students in all, how many are boys?

Answers

Answer:

25

Step-by-step explanation:

5+7 is 12, 60 divided by 12 is 5.   5x5 is 25

It’s would be approximately 25 hope that helped :)

Evaluate, if x = -12, y = -4, and
z is = 9

Answers

Is there a problem that goes with it or is this it

Carrie usa 6 limones para hacer 24 onzas líquidas de limonada. Carrie está planeando una gran fiesta y necesita hacer 288 onzas líquidas de limonada. ¿Cuántos limones necesitará usar para mantener la receta proporcional?

Answers

Answer:

72 lemons

Step-by-step explanation:

Carrie uses 6 lemons to make 24 fluid ounces of lemonade. Carrie is planning a big party and needs to make 288 fluid ounces of lemonade. How many lemons will she need to use to keep the recipe proportional?

Hence:.

24 fluid ounces = 6 lemons

288 fluid ounces = x lemons

24 x = 288 × 6

x = 288 × 6/24

x = 72 lemons

What is the slope of the line that passes through (12, 10) and (11, 15)?

Answers

Slope = (y2-y1)/(x2-x1)
(15-10)/(11-12) = 5/-1 = -5
The slope is -5

Answer:

slope = -5

Step-by-step explanation:

Trust me I made a graph

Nadia is a stockbroker. She earns 13​% commission each week. Last​ week, she sold ​$4,500 worth of stocks. How much did she make last week in​ commission? If she averages that same amount each​ week, how much did she make in commission in​ 2011?

Answers

Multiply amount sold by commission rate:

4500 x 0.13 = 585

She made $585 last week.

Multiply amount made in 1 week by 52 weeks ( 1 year = 52 weeks)

585 x 52 = 30,420

She made $30,420 in 2011

Twice a number k plus 8 equals one-half times the quantity of four times a number k plus fourteen ?

Answers

Answer:

No solutions

Step-by-step explanation:

So putting that into an equation it equals

2k+8=(4k+14)÷2

Move the 2 to the other side.

2∙2k+8=4k+14

Simplify.

4k+8=4k+14

It doesn't make sense so No Solutions

P(-6, 4), O-2, 7), R(-1, 0), S(-5, -3)
Please help ASAP

Answers

Iucenuvnuejiwnuwh fvewfvewinhufewv

I need help with this question asap please

Answers

Answer:

62

Step-by-step explanation:

(82-2)-2× 3^7 ÷ 3^3

___________

3^2

80 - 2 × 3^4

_________

3^2

80 - 2 × 3^2

80 - 2 × 9

80 - 18

62

Can someone please help

Answers

Answer:

2x+7

Step-by-step explanation:

F(x+3)=2(x+3)+1

F(x+3)= 2x+6 +1 =2x+7

s Help Request edit ac 34 33 The first four terms of a quadratic sequence are shown below. 6, 9, 14, 21, ... The first five terms of a geometric sequence are shown below. -25, 125, -625, 3125 - 15625 32 What is the difference between the 5th term and the 6th term of the quadratic sequence? What is the common ratio of the sequence? A. 3 B. 7 C. 11 A. { B. C. - D. - D. 13 5 huu 10 a linear sequence The first five terms are shown below. 8, 6, 4, 2, 0, ... What is the 100th term in the sequence? A - 192 B = 190 C. - 108 D. 90​

Answers

B= 190 is the answer

A coin collection consists of dimes and nickels. If there are a total of 500 coins valued
at $39. how many dimes are there?

Answers

Answer:

There are 280 dimes

Step-by-step explanation:

A nickel is worth 5 cents while a dime is worth 10 cents

Let n be number of nickel

d the number of dimes

n + d = 39

Secondly

$39 is same as 3900 cents

So we have;

10d + 5n = 3900

From first equation;

n = 500-d

Put this in second equation;

10d + 5(500-d) = 3900

10d + 2500-5d = 3900

5d = 3900-2500

5d = 1400

d = 1400/5

d = 280

The difference of two numbers is 3. Their sum is 13. Find the numbers.

Answers

Answer:

Answer:

The two numbers are 8 and 5

Explanation:

8 - 5 = 3

8 + 5 = 13

Hope this helps!

14 ÷ (2 + 5) what the answer to this?

Answers

2

Bidmas
Brackets
Indicies
Divide
Multipy
Add
Subtract

Answer:

2

Step-by-step explanation:

2+5 = 7                 14 divided by 7 is 2

mark as brainliest plz

Two years ago, Jose bought $750 worth of stock in a cell phone company. Since then the value of his stock has been DECREASING at an average rate of 5 1/4 % per year. How much is the stock worth now?

Answers

Answer:

$671.25

Step-by-step explanation:

To get the amount by which the stock have reduced after 2 years, we will use the interest formula;

Interest = Principal * rate * time/100

Interest = 750*5 1/4 * 2/100

Interest = 750*21*2/400

Interest = $78.75

This means that the value of the stock has reduced by $78.75 after 2 years;

Amount that the stock worth now = $750 - $78.75

Amount that the stock worth now = $671.25

Given L(-4, 3) and M(-7, -2), what is the length of segment LM?

Answers

Answer:

[tex]d = \sqrt{34}[/tex]

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to Right

Algebra II

Distance Formula: [tex]d = \sqrt{(x_2-x_1)^2+(y_2-y_1)^2}[/tex]

Step-by-step explanation:

Step 1: Define

Point L (-4, 3)

Point M (-7, -2)

Step 2: Find distance d

Simply plug in the 2 coordinates into the distance formula to find distance d.

Substitute [DF]:                    [tex]d = \sqrt{(-7+4)^2+(-2-3)^2}[/tex]Add/Subtract:                       [tex]d = \sqrt{(-3)^2+(-5)^2}[/tex]Exponents:                           [tex]d = \sqrt{9+25}[/tex]Add:                                      [tex]d = \sqrt{34}[/tex]

Omar says that 4a times 4a will get 16a. Explain his mistake.

Answers

Answer:

You have to multiply be A before each other

Step-by-step explanation:

100 POINTS + BRAINLIEST! PLEASE ANSWER ASAP (answer both or no points)

Answers

Answer:

A for the first one and E for the second one.

Step-by-step explanation:

These are the only ones that follow the corospondibg x and y values.

Answer:

this was 3 years ago so guessing you don't need anymore

Step-by-step explanation:

I dont have any points and i need to ask a question

How many solutions does the following function have? f(x)=4x^2-100

Answers

Answer: x = 5, -5

Step-by-step explanation:

Solve using the quadratic formula.

92 if I’m wrong I’m sorry

Helppppppppppppp please

Answers

Answer:

J.)

Step-by-step explanation:

if you make there width to their length a ratio - like for the top you would do 8/2 - then the bottom is different. They all simplify to 4/1 except the bottom.

12/3 = 4/1

2/.5 = 4/1

10/2.5 = 4/1

10/4 = 5/2

The points (2, 5) and (1, 1) fall on a particular line. What is its equation in slope-intercept form?

Write your answer using integers, proper fractions, and improper fractions in simplest form.

y=
x-

Answers

x= cgggvvvvy the best

Find P(5) when p = 0.38


i was swamped with work and my anxiety is flying off the charts rn

Answers

Step-by-step explanation:

p = 0.38

0.38 × 5

= 1.9

hope it helpful

Enter the equation of the line in slope-intercept form. Enter the answer in fraction form.

The line perpendicular to y =
5
3
x + 8 that passes through (5, −1).

The equation of the line that passes through (5, −1) is y = .

Answers

Answer:

25

Step-by-step explanation: this is because you have a negative

What expressions are equivalent to 6.7 - (-2.5)

Answers

Answer:

[tex]6.7-\left(-2.5\right)=9.2[/tex]

Step-by-step explanation:

Given the expression

[tex]6.7-\left(-2.5\right)[/tex]

Solving the expression to get the equivalent function

[tex]6.7-\left(-2.5\right)[/tex]

[tex]\mathrm{Apply\:rule}\:-\left(-a\right)=a[/tex]

[tex]=6.7+2.5[/tex]

[tex]\mathrm{Add\:the\:numbers:}\:6.7+2.5=9.2[/tex]

[tex]=9.2[/tex]

Thus,

[tex]6.7-\left(-2.5\right)=9.2[/tex]

Allan can make 8 pizzas in 15 minutes at the pizza restaurant where he works. 28. __________ If the number of pizzas varies directly with minutes, how many pizzas can Allan make in 3 hours?

Answers

Answer:

96 pizzas

Step-by-step explanation:

First, we have to determine how many pizza he can make in one minute = 8/15 = 0.533

Convert 3 hours to minutes = 3 x 60 = 180 minutes

The number of pizzas he would make in 3 hours = 180 x 0.533 = 96 pizzas

helppp me plssss because it’s a test

Answers

Answer:

3

Step-by-step explanation:

SHOW WORK PLZZZZZZZZZZZZZ!!!!!!!!!!!!!!!!!!!!!!

Answers

Answer:

(x+1)(x+5)(5x−1)

x= 1/5, -5, -1

Step-by-step explanation:

5x^3+29x^2+19x-5

factor

(x+1)(x+5)(5x−1)

the zeros are

x+1=0

x=-1

x+5=0

x=-5

5x-1=0

5x=1

x=1/5

maybe this helps

Complete the steps to solve for x.
-0.51x + 0.21x = 6.3
- 0.51x + 0.21x = 6.3
x = 6.3

Answers

Answer:

Step-by-step explanation:

-0.51x+0.21x=6.3  combine like terms

-0.3x=6.3  divide by -0.3

x= -21

ANSWER ASAP FOR BRAINLIEST

Answers

Answer:

I CANT SEE THE IMAGE BUT I NEEED POINTS xD

Step-by-step explanation:

PERIODDDDDDDDD

Answer:

Laptops, 82 is the largest number when you look at the totals.

Step-by-step explanation:

gender|    electronic tablet | Laptop | Both | Neither | Total

----------|----------------------------|------------|---------|-------------|--------

girl       |      13                       |    51      |   8     |      17      |   89

boy      |      12                       |    31      |   5     |      13      |   61

total     |      25                      |    82     |   13    |     30     |    150

LMK If I have to explain but I basically just got the 150 students from the directions and went from there.

Find the slope and the y-intercept of the graph of the linear equation y=5/4x-7. The slope is ?, and the y-intercept is ?.

Answers

Answer:

Not Linear.

Step-by-step explanation:

Answer:

5/4 slope

-7 y intercept.

Step-by-step explanation:

The slope is the number in front of the x. The number in front of the x is 5/4. The slope is 5/4

1. The y intercept is whatever is behind the x or 0 if there is no number following the x.  

2. The y intercept is also characterized by being on the same side of the equation as the x.

3. Finally it has no x in it.

In this case the y intercept is -7

Examples

y + 2 = x    2 is not the y intercept. subtract 2 from both sides. y = x - 2. Therefore -2 is the y intercept.

2y = 4x + 6                4 is not the slope. You have to divide by y = 2x+3. So 2 is the slope and 0,3 is the y intercept.

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