A vision insurance company selects a SRS of 300 clients who wear contact lenses. They randomly assign 200 clients to the experimental group to receive an app that promotes contact lens hygiene. The remaining 100 clients form the control group. Suppose that without the app, 96%, percent of their clients with contact lenses would have healthy eyes for the year, and that with the app, 99%, percent would have healthy eyes.

After a year, the insurance company looks at the difference (Experimental−Control) between the proportions of clients with healthy eyes in each group.

What will be the shape of the sampling distribution of the difference in sample proportions, and why?


A

Approximately normal, because we expect 288 healthy and 12 not-healthy in both groups, and all of these counts are at least 10.


B

Approximately normal, because we expect 192 healthy and 20 not-healthy eyes for the experimental group, and 96 and 40 for the control group, and all of these counts are at least 10.


C

Not normal, because we expect fewer than 10 clients with healthy eyes in both groups.


D

Not normal, because we expect fewer than 10 clients with not-healthy eyes in both groups.

Answers

Answer 1

Answer:

NO, its D: Not normal, because we expect fewer than 101010 clients with not-healthy eyes in both groups.

Step-by-step explanation:

.


Related Questions

Divide 7680 by 32 what do i do

Answers

Answer:

240

Step-by-step explanation:

Using long division i got this :

   0 2 4 0

3 2 7 6 8 0

 − 0      

   7 6    

 − 6 4    

   1 2 8  

 − 1 2 8  

       0 0

     −   0

         0

Hope this helps!

A store is having a sale where all shoes are discounted by 20%. Diego has a coupon for $3 off of the regular price for one pair of shoes. The store first applies the coupon and then takes 20% off of the reduced price. If Diego pays $18.40 for a pair of shoes, what was their original price before the sale and without the coupon?

Answers

Answer:

26.00

Step-by-step explanation:

Answer: 18.40

Step-by-step explanation:

0.8 x  (x-3)= 18.40

Work out the surface area of this cylinder.

Please help, I will award brainliest.

Answers

Answer:

8*16.8 which is 302.4

Step-by-step explanation:

The author also uses _________ to describe the building and to give the reader a sense of "forbidding" or imposing fear.

repetition
imagery
irony
personification

Answers

Answer:

Imagery

How:

By describing the building through imagery, explaining it's appearance/past/history/story (and assuming it's bad), gives the listener a feeling of "forbidding" or imposing fear.

DEFINITIONS:

Forbidding: Unfriendly or threatening in appearance.

Imposing fear: Someone noticeably feared by something/someone.

Find the missing terms in the
sequence 27, ? , 23, ? , 19,...
good luck​

Answers

Is it subtract by 2? So I think it would be 27,25,23,21, 19

How do I solve this???

Answers

So the answer would be letter D

ASAP PLEAE HELP
I WILL GIVE BRAINEST

FIND THE INDICATED MISSING ANGLE MEASURE.
ROUND THE ANGLE MEASURE TO THE NEAREST WHOLE DEGREE.

Answers

Answer:

21.801

Good luck

The diameter of a circle is 16 units.
What is the radius of the circle?

Answers

Answer:

radius is diameter over two

Step-by-step explanation:

so 16 divided by two will be 8

Hey can some one help me, Define a variable and write each phrase as an algebraic expression:

1. Six feet less than the width

2. 6 hours more per week than Theodore studies

3. Six years less than Tracy's age

4. 2 less than one-third of the points that the panthers scored​

Answers

Answer:

1. d - 6 ft

where d is the width

2. t + 6 h/week

where t is the amount of time per week Theodore studies

3. t’ - 6 a

where t’ is Tracy’s age

4. (k/3) - 2

where k is the points that the panthers scored

Step-by-step explanation:

Write the variable and do the operations as described!

“less than” means subtraction, “more […] than” means addition and “one-third of” means division by 3.

Pls help and thank you so much

Answers

Answer:

y=4x+3

Step-by-step explanation:

y intercept is 3 and x is 4

Simplify. Consider all cases. |12 - x|

The second one is filled out. It would be appreciated if someone filled out the first and third.

Also, I am giving out brainliest and a follow + 50 points. Please help me guys.

Answers

Answer:

x-12 if x>12

0 if x is 12

12-x if x<12

Step-by-step explanation:

hope it helps

x-12 if x>12

0 if x is 12

12-x if x<12

Fred has a garden. He has 10 aucumber plants. This is 5% of all the plants in his garden. How many plants dons Fred have in his garden?​

Answers

The answer is 200 plants in Fred’s garden.

In the figure below, ∠HFG≈HKJ and ∠HF≈HK

Using the information provided, select the triangle congruence criterion that can BEST be used to prove that
ΔHFG≈ΔHKJ.

A. angle-angle-side (AAS)
B. angle-side-angle (ASA)
C. side-side-angle (SSA)
D. side-angle-side (SAS)

Answers

Answer:

D

Step-by-step explanation:

The triangles ΔHFG and ΔHKJ are congruent with each other by ASA postulates. Then the correct option is B.

What is the triangle?

The polygonal shape of a triangle has a number of sides and three independent variables. Angles in the triangle add up to 180 °.

The ratio of the matching sides will remain constant if two triangles are comparable to one another.

In triangles ΔHFG and ΔHKJ, then the condition is given as,

∠HFG = ∠HKJ          (Given)

HF = HK                    (Given)

∠FHG = ∠JHK          (Vertically opposite angles)

The triangles ΔHFG and ΔHKJ are congruent with each other by ASA postulates. Then the correct option is B.

More about the triangle link is given below.

https://brainly.com/question/25813512

#SPJ2

On what interval is the function decreasing
I NEED HELP PLLLZE

Answers

Answer:

The answer is

The first choice

URGENT! WILL GIVE BRAINLIEST

Answers

Answer:

The answer is 1/6 im pretty sure

Step-by-step explanation:

if your using fractions it would usually be 1/6

Answer:

B. P(T of 3) = 1/6 and P(E of 3) = 22/135

Step-by-step explanation:

Number of rolls ⇒ 270A number 3 comes up ⇒ 44

Experimental probability of rolling a 3 is:

P(E) = number of times event occurred/ number of experiments P(E) = 44/270 = 22/135

Theoretical probability of rolling a 3 is:

P(T) = number of favorable outcomes/number of total outcomesP(T) = 1/6

Correct answer choice is B

write down the multiples of 7 between 44 and 54.​

Answers

49 is the only answer.
Multiples of 7 include ...35, 42, 49, 56, 63....
49 is the only one that is in between 44 and 54.

The  multiples of 7 between 44 and 54 is, 42 and 49

What are multiples ?

In mathematics, when we multiply one whole number by another whole number, we have multiples as the result. Or, to put it simply, when you multiply a number, you receive its multiples

Given that,

A number 7,

We have to found multiples of 7 between 44 and 54

Let's identify the multiples of 7 that are not zero to see how that aids in our understanding of multiples.

The  multiples of Seven that are not zero are,

7x1 = 7,

7x2 = 14,

7x3 = 21,

7x4 = 28,

7x5 = 35,

7x6 = 42,

7x7 = 49,

7x8 = 56

We can see that the lists of  the multiples of Seven.

Hence, the multiples are in between 44 and 54 are, 42 & 49

To know more multiples check:

https://brainly.com/question/11527721

#SPJ6

Graph the solutions of the given system of linear inequalities.
y < 3x-2
y ≤ x + 1

Answers

Answer:

pls upload photo for your question

Jillian wanted to determine the difference of 7 and a number, n. She wrote in a table several possible expressions she could use to represent this. Which is the correct expression number?

Expression Number
Expression
1
n minus 7
2
7 minus n
3
7 n
4
StartFraction n Over 7 EndFraction



Expression number:

Answers

Answer:

2n

Step-by-step explanation:

Please help marking Brainiest

Answers

Answer:

the answer is y=30x

Step-by-step explanation:

however many inches times 30 is the consistent answer to the equation    

Answer:

y=30x

Step-by-step explanation:

We can start out by writing our slope-intercept form equation: y=mx+b. In this case, our y-intercept is 0, so we can write y=mx.

Let's find the slope. We can take the points (1,30) and (2,60). We can use the formula [tex]\frac{y_2-y_1}{x_2-x_1}[/tex] to find our slope. Plug these values in, and we get [tex]\frac{60-30}{2-1}[/tex]. Evaluate this, and our slope is 30. So, our equation is y=30x.

Hope this helped!

In the diagram to the​ right, GKNMVRPT. Find the value of x. Give the scale factor of the left polygon to the right polygon

Answers

Answer:

Step-by-step explanation:

X+2

Just cant wrap my head around this, I'm trying to focus on the more difficult question and this is just hurting my brain. I need the simplest radical form. Thank you very much

Answers

Answer:

step elementary school of the frog said april

2(7n - 1) >= 3(5 - n)​

Answers

Answer:

n >= 1

Step-by-step explanation:

2(7n - 1) >= 3(5 - n)

use the distributive property

14n - 2 >= 15 - 3n

     +2       +2      

14n >= 17 - 3n

+3n          +3n

17n >= 17

n >= 1

Plz mark as brainliest if this helped! Have a nice day!!!

-Lil_G

Step-by-step explanation:

[tex]2(7n - 1) \geqslant 3(5 - n) \\ 14n - 2 \geqslant 15 - 3n \\ 14n + 3n \geqslant 17 \\ 17n \geqslant 17 \\ n \geqslant 1 \\ thank \: you[/tex]

Can someone solve for X please!!

Answers

Answer:

2x16= -32 x-6 x-6

Step-by-step explanation:

2x-16 =-32 and x - 6 = x - 6praises

Please answer these 2 questions

Answers

1. Perpendicular to its radius
2. 0
Yes the first person is right.

Andy buys shoes that are on sale for 25% off the regular price. If the sale price is $36.45, what was the regular price of the shoes to the nearest cent?​

Answers

She bought the shoe at a percent of 25

Help me please find x for this triangle!!!!

Answers

89 degrees I think sorry if I’m wrong

Can anyone help me? I'm pretty puzzled

Answers

Angle 1 + Angle 2 = 180°

(7x)° + (x + 20)° = 180°

(8x + 20)° = 180°

8x = 180 - 20

8x = 160

x = 160/8

x = 20

7(20) = 140° and 20 + 20 = 40°

Answer: 40° and 140°

The area of a rectangle is 47.5 square centimeters. The
base of the rectangle is 5 centimeters. What is the height of
the rectangle in centimeter?

Answers

SHORT ANSWER: 84cm

Let width = w

Let length = w + 5

The area of a rectangle is found by multiplying its width by length and the problem states that the area is 84 cm2.

(Width)(Length) = 84

(w)(w + 5) = 84

w2 + 5w = 84

w2 + 5w - 84 = 0

(w + 12)(w -7) = 0

w + 12 = 0

w = -12

The width of a rectangle can't be NEGATIVE!!! Forget about that!

w - 7 = 0

w = 7

Now go back to naming the variables and replace the w with 7.

Length = w + 5 = 7 + 5 = 12

Width is 7 cm. Length is 12 cm.

Check it. Is 7 x 12 = 84? Yes.

Answer:

9.5

Step-by-step explanation:

You have to divide 47.5 and 5

Hope this helps lol

Fastttt I have 2 more mins please someone answer

Answers

Answer:

Step-by-step explanation:

is 50

360-230=130

180-130=50

can someone help me please
I will mark you brainliest ❣️

Answers

9514 1404 393

Answer:

  26. B(t) = 500·1.075^t; B(6) ≈ $772

  27. G(t) = 70·0.72^t; G(3) ≈ 26 g

Step-by-step explanation:

The equation with the plus sign is used when the value is increasing. The minus sign is used when the value is decreasing. The 'a' in each equation is the initial value.

__

26. B(t) = 500·1.075^t

  B(6) = 771.65

The balance after 6 years is about $772.

__

27. G(t) = 70·0.72^t

  G(3) = 26.127

About 26 grams are left after 3 days.

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