The manager of a grocery store has selected a random sample of 100 customers. The average length of time it took these 100 customers to check out was 3.0 minutes. It is known that the standard deviation of the checkout time is 1 minute. Refer to Exhibit 8-2. If the confidence coefficient is reduced to .80, the standard error of the mean _____.

Answers

Answer 1

Answer:

The standard error of the mean remains unchanged.

Step-by-step explanation:

Given that:

The standard error (S.E) of the mean [tex]= \dfrac{\sigma}{\sqrt{n}}[/tex] with is independent of confidence coefficient.

The margin of error [tex]E = z \times S.E[/tex]

This explains the claim that as the confidence coefficient reduces, the z-value also reduces, so as the Margin of error (E) but the standard error will always remain unchanged.  

i.e.

From the question;

sample size n = 100

standard deviation = 1

mean = 3.0

The standard error (S.E) of the mean [tex]= \dfrac{1}{\sqrt{100}}[/tex]

= 0.1

So, if the confidence coefficient is reduced to 0.80, the standard error of the mean remains unchanged.


Related Questions

6) Choose which postulate proves the triangles congruent.

Answers

Answer:

SAS(Side.Angle.Side

Step-by-step explanation:

since x is mid point of pr and qs so px=xr and x is midpoint of qs so qx=sx,

and two lines intercept so angles made on point x are equal.....hence 2 sides and one angle proved so triangles are equal

The postulate that can be used to prove that triangle QXP and triangle SXR are congruent to each other is: SAS Congruence Theorem,

Recall:

Two triangles are congruent by the Side-Angle-Side Congruence Theorem, if two sides and one included angle of one triangle are congruent to two sides and the corresponding included angle in the other triangle.

Since X is a midpoint of QS and RP, therefore:

[tex]PX \cong RX\\\\QX \cong SX\\[/tex]

Also,

<PXQ = <SXR (vertical angles are congruent)

Thus, triangle QXP and triangle SXR are congruent by SAS.

Therefore, the postulate that can be used to prove that triangle QXP and triangle SXR are congruent to each other is: SAS Congruence Theorem,

Learn more here:

https://brainly.com/question/25126660

TS is an angle bisector. If m∠RTS=x+10 and m∠UTS=2x+5, find m∠RTU.

answer choices below


30°30 degrees

15°15 degrees

80°80 degrees

Answers

Answer:

m∠RTS= 15°, m∠UTS= 15°, m∠RTU= 30°

Step-by-step explanation:

Since TS bisects RTS and UTS, that means the two angles are equal to each other. So let's find x first.

x+10=2x+5, subtract x to both sides

10=x+5, subtract 5 to both sides

x=5

Since RTU is basically RTS plus UTS, let's add the two angles together

x+10+2x+5, combine like terms

3x+15

Then we can plug in 5 for x

3(5)+15

15+15

=30

So, RTU is 30 degrees

Answer:

kjndnsadnsdnasnldnkasbdkbaskbjdbLol i dont caewnsnasdHBsadHKUsadkhsdkkbhaSKHChASKUCDKJGCHakbsDKskbhaKHDHU

Step-by-step explanation:

When someone donated 14 gallons of paint to Rosendale Elementary School, the fifth grade decided to paint a mural. They split the gallons equally among the four classes.
b. how much paint will three classes use?
c. If 4 students share a 30-square footwall equally, how many square feet of the wall will be painted by each student?
d. what fraction of the wall will each student paint?

Answers

Answer:

Step-by-step explanation:

So, first we can do 14/4 which is 3.5

Each class uses 3.5 gallons

For (B), we can do 3.5 * 3 which equals 10.5 gallons

For (C), we can do 30÷4 which is 7.5 square feet

For (D) they each paint 1/4 of the wall

Ms. Mickelson is purchasing some baseball shirts for her son’s baseball team. She will pay $10.50 for each shirt plus a one time fee of $20 for the team logo design. Which table best represents y, the total cost of x number of shirts?

Answers

Answer:

D.

Step-by-step explanation:   {y1=mx1+b}

x1      l      y1

------------------

8       l    104   <------------Answer

12      l    146

        l

        l

m = 10.5    

b = 20

During basketball practice, Mai attended 40 free trows and was successfully on 70% of them. How many successfully trows did she make?

Answers

Answer:

28

Step-by-step explanation:

40×70% or 40×.7= 28 so 28 is 70% of 40

Find the area. Round to the nearest hundredth if necessary

Answers

Answer:

138.16

Step-by-step explanation:

a=3.14 x 44

the formula is a=pie x r squared

they have given you diameter so, it is simply pie x diameter

or 3.14 x 44

PLEASE I NEED HELP RIGHT NOW! THANK YOU!

For each equation, tell whether it is always, sometimes, or never true. Explain your reasoning in words.

Answers

Answer:

For d: x=2

Step-by-step explanation:

Lets +1 on both sides so 9+1=10. Now the equation is 5x=10

Divide 10÷5=2

If 100 feet of fence is used to enclose a rectangular yard, then the resulting area is given by
A=x(-x+50) where x feet is the width of the rectangle and feet is the length. Determine the length and width that give maximum area.

Answers

Answer:

Step-by-step explanation:

10 points pls help me this is urgent if i don’t do this i won’t pass

Answers

Answer:

Here's something to help you

Step-by-step explanation:

I'm using the second question as an example.

To find the Unit Rate, you have to divide the amount of money by the amount of whatever the product is

5.99/8= 0.74875

Since the question says to round it to the nearest hundredth, that means the price per unit (unit rate, or the price for one battery here) would be about $0.75. Simple, right?

Please answer this correctly without making mistakes

Answers

Answer:

35% off

Step-by-step explanation:

35% will give him a greater deal

A wise man once said, “400 reduced by 3 times my age is 163.” What is his age? ( I need the step by step equation to solve this)

Answers

Answer: the wise man is 79

Step-by-step explanation:

400 - 3x = 163

400–163 =3x

237 = 3x or 3x = 237 or x = 79…

$4200 with a 35% markdown

Answers

Answer:

$2,730.00

Step-by-step explanation:

35% of $4,200 is $1,470. Subtract 1470 from 4200 to get $2,730.00

~theLocoCoco

what ratio represents the tangent of

Answers

Answer:

Step-by-step explanation:

15/8

give me brainliest pls

15/8

Brainliest pls :D

What are the zeros of the function

Answers

Answer:

(1,0)

Step-by-step explanation:

A.K.A the y and x intercepts you might need to do a little more math you get the y intercept tho

can someone help me ​

Answers

9514 1404 393

Answer:

  M = 7x² +21

Step-by-step explanation:

Subtract the unwanted terms on the left from both sides.

  (-7x² +6x -16) + M = 6x +5

  M = 6x +5 -(-7x² +6x -16)

  M = 7x² +21 . . . . simplify

What is the slope of the line that passes through the points (a, b) and (c, b)?

Answers

Slope: (y2-y1)/(x2-x1)
(b-b)/(c-a) = 0/(c-a) = 0
The slope is 0

adding fractions with unlike denominators 1/3 + - 2/7​

Answers

Answer:

1/21

Step-by-step explanation:

Changing operations to eliminate negative numerators the equation becomes

=1/3−2/7

With unlike denominators find the Least Common Denominator (LCD)

LCD = 21

Multiplying numerators and denominators to get the LCD in all fraction denominators

=1×7/3×7  −2×3 /7×3

Then rewriting the equation with the equivalent fractions

=7/21−6/21

With like denominators we can operate on just the numerators

=7−6/21

=1/21

Answer:

you're correct.

Step-by-step explanation:

Write an equation of the line that passes through each pair of points (- 2, - 3), (4, 5)

Answers

Answer:

y= 4/3x -1/3

Step-by-step explanation:

Find slope: y2-y1/x2-x1 = 5-(-3)/4-(-2) = 8/6 = 4/3

Use point slope to find the equation:

y - y1 = m ( x - x1 )

y - (-3) = 4/3 ( x - (-2))

y = 4/3x + 8/3 + (-3)

y = 4/3x + 8/3 - 9/3

y= 4/3x -1/3

Using the graphing function on your calculator, find the solution to the system
of equations shown below.
2y- 4x= 6
y- 2x=7
A. No solution
B. More than 1 solution
C. x= 4, y=-2
D. X= -1, y= 1

Answers

48 hdjehddhbeebjehrebbrrbrbfbfbfbfbfnfbf

Line segment pq shown on the graph below, is rotated 90 counterclockwise about point q to form pq

Answers

Answer:

this isn’t a 100% guaranteed correct answer but maybe the second option saying “PQ and P’G’ are parallel”

(i’m doing the test rn)

Answer: PQ and P’Q’ are perpendicular (3rd option)

Step-by-step explanation: they’re both perpendicular

HELP I WILL RATE !!!!!!!

Answers

No picture, nothing to rate here.

Simplify the following expression: -4(-4d - 5)

Answers

Answer:

4⋅(4d+5)

Step-by-step explanation:

You have $500, sale price is $435. How much change will you get

Answers

500-435= 65
I’m sorry if this is wrong it’s two in the morning
I guess this is what college does to u....

Answer:

go to sleep its 11:23 also u will get

$65 dollars pls mark me brainleist

Step-by-step explanation:

In an election for school president, the loser received 70% of the winner's votes. If 969 votes were cast, how many did each receive?

Answers

Answer:

The ans would be 291 (however we can round this off to 290 as no can partially vote as 0.1)

Step-by-step explanation:

We can easily find the loser's vote by-

70% of 969= 678.9

now, all we need to do is find the winners vote

we know that the total no. of votes= 969 & we know the no. of votes loser got

so, subtracting the losers vote from 969 would give us the remaining no. of votes (the winner's votes)....so,

969-678.9=290.1

we can round this off to 290

 

PLEASE HELP WILL MARK BRAINLEIST

Answers

Answer:

The second one

Step-by-step explanation:

because 1•4=4 and 2•2=4

Please help! 35.1 x 8.4 = ??

Answers

Answer:

294.84

should be correct, I used a calculator.

The answer is 294.84

Happy I helped.

the subway train can hold a 792 people on Tuesday 56941 people rode the subway how many trains could 56941 people how many people would be left over ​

Answers

Answer:

56,149 would be left over

Step-by-step explanation:

56,941-792=56,149

what is an array in multiplication?

Answers

Answer:

An arrangement of objects, pictures, or numbers in columns and rows is called an array

Answer:

An array is a way to represent multiplication and division using rows and columns. Rows represent the number of groups. Columns represent the number in each group or the size of each group

The sum of Katelynn’s parents' ages is 80. Katelynn’s father is 4 years older than her
mother. Write and solve an equation to determine both her parents’ ages.

Answers

Answer:

Step-by-step explanation:

M=Mum

D=Dad

K=Katelynn

M+D=80

The rest

Which number line shows the solution of 4x-36<-12 HELP PLZZZZZZ

Answers

Answer:

A

Step-by-step explanation:

Please mark brainliest.

The answer to your question is A
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