Mathematics High School

A manager of the credit department for an oil company would like to determine whether the mean monthly balance of credit card holders is equal to $75. An auditor selects a random sample of 100 accounts and finds that the mean owed is $83.40 with a sample standard deviation of $23.65. If you were to conduct a test to determine whether the auditor should conclude that there is evidence that the mean balance is different from $75, which test would you use? a) Z-test of a population mean b) Z-test of a population proportion c) t-test of population mean d) t-test of a population proportion

Answers

Answer 1

Answer:

c) t-test of population mean

Explanation:

The t-test statistic is used in hypothesis testing. Here we would use a one sample t test to test our hypothesis. The one sample t test measures the statistical difference between the hypothesized mean and the sample mean. In a one sample t test or single sample t test, a test variable is measured against a test value.

Example we compare our test variable to the hypothesized mean value $75 above.

The t test is used instead of z score when standard deviation is unknown.

Using the t test, we either accept or reject the null hypothesis given alternative hypothesis.

Related Questions

The x-intercept can be found by putting in zero for y. Find the x-intercept.
-3x + 5y 30

Answers

30 because 5x0=0, 0+30=30z

If you make $60 in 8 hours, what is the unit rate? hint: what is your hourly pay?

Answers

Answer:

$7.50

Step-by-step explanation:

Answer:

60 divided by 8 is 7.5

the unit rate is 7.5 and the hourly pay is $7.50

AB=10 and BC=20 What is AC

Answers

25 I think so I may be Incorrect

Answer:

6

Step-by-step explanation:

A to B is 10

B to C is 20

You add them together and you get 30. A straight line is equal to 180.

You divide 30 to 180 and you get is 6.

HELP PLEASE Which of these mappings is a function?

Answers

Answer:

B; x is the one that's a function because for every input there is one output. for all the other ones a x-value has two y-values and that's not function.

Step-by-step explanation:

Divide the following polynomial using synthetic division, then place the answer in the proper location on the grid. Write answer in descending powers of x. (x4+81) / (x-3)​

Answers


x^4-81= x^4+0x^3+0x^2+0x-81

! 1 0 0 0 -81
x+3→-3 ! -3 9 -27 81
---------------------------------------
1 -3 9 -27 0

x^3-3x^2+9x-27

Answer: x^3-3x^2+9x-27

Reflect AABC across the x-axis.
1. How many units away from the x-axis
is point A?


PLEASEE I REALLY NEED HELP!!!!!

Answers

The position of point A of the triangle is -4 units from the x-axis.

What is coordinate geometry?

A coordinate plane is a 2D plane created by the junction of the x-axis and y-axis, two perpendicular lines. A coordinate system in geometry is a way to use one or more integers or coordinates to determine the positions of the points.

Here in the given diagram, there is a triangle ABC. The coordinates of the vertex of the triangle are,

A ( -4,2 )

B ( 1, -5 )

C ( 3,1 )

The distance of point A from the x-axis is -4 units.

To know more about coordinate geometry follow

https://brainly.com/question/30097833

#SPJ7

Sixty-five percent of what number is 26?

Answers

Answer:

40

Step-by-step explanation:

40 x 0.65 = 26

26 ÷ 0.65 = 40

Select the correct answer.

Which statement is true?

A. In any right triangle, the sine of one acute angle is equal to the cosine of the other acute angle

B. In any right triangle, the sine of one acute angle is equal to the sine of it's complementary angles.

C. In any right triangle, the cosine of one acute angle is equal to the cosine of it's complimentary angle.

D. In any right triangle, the sum of the sine of one acute angle and the cosine of the other acute angle is 1.​

Answers

Answer:

The answer is B

Step-by-step explanation: Hope this helps

1234567891011121314151617181920

Answers

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100

please please help i’ll give brainliest tysm:))

Answers

Assuming she ran the Same number of miles per week the answer is 20.5
328/16 =20.5

[tex]answer = \frac{328}{16} = 20.5[/tex]

20 Points!

I'm Really confused on this please help.

Write three points (x, y) that exist on the line.

Answers

Answer:

3 points on the line - (.5,3) (1,2) (1.5,1)

Step-by-step explanation:

y = -2x + 4      (1.5,1)

1 = -2x + 4    subtract 4 from each side

-3 = -2x        divide each side by -2

1.5 = x

y = -2x + 4      (1,2)

2 = -2x + 4    subtract 4 from each side

-2 = -2x        divide each side by -2

1 = x

y = -2x + 4      (.5,3)

3 = -2x + 4    subtract 4 from each side

-1 = -2x        divide each side by -2

.5 = x

Answer:

(1,2) (2,0) (3,-2)

Step-by-step explanation:

What I did to get those is plug in the numbers 1, 2, and 3 as values of X.

-2(1)+4

that gave me 2 as the Y value and now we have the coordinate (1,2).

-2(2)+4

that gave me 0 as the Y value and now we have the coordinate (2,0).

-2(3)+4

that gave me -2 as the Y value and now we have the coordinate (3,-2).

hope this helps.

The gym teacher is setting up for a field
day event where students will run
blindfolded through a series of
obstacles. To prevent injury she will
enclose the area with a nylon fence,
which can be ordered from Lowe's for
$15 a linear yard. How much will the
nylon fencing cost?

Answers

$630

The total perimeter is 42 and 42x15=630

Write the recursive formula for 16,23,30,37

Answers

Answer:

Arithmetic Sequence

Step-by-step explanation:

Arithmetic Sequence

please help asap!!!!


An airplane is flying at an elevation of 11,000 feet. The airport is 4 miles away from a point directly below the airplane on the ground. How far is the airplane from the airport? (Hint: 1 mile = 5280 feet)

Answers

Answer:

I think it would be 21120

Step-by-step explanation:

srry if im wrong, but hope this helped! also pls correct me if its wrong ty :3

What is the solution set of the equation 9x^2 +6x = -1

Answers

Answer:

x= -1/3

Step-by-step explanation:

9x^2+6x+1=0

(3x+1)(3x+1)

x=-1/3

Answer: x= -1/3

Step-by-step explanation: The step take to long to write It’s only 3 step but going to be long but hope this answer help

Find the value of the expressions when; a2+b +7 when a=5 and b=11.

Answers

28 is the answer your welcome

What is the sum of 2/7 + 2/5 ?
please help 10 points and brainlest

Answers

Answer:

2/7 + 2/5=24/35

will give brainliest (9th grade geometry)
If the scale factor of Figure A to Figure B is 7:2, find the perimeter of Figure A.

Answers

Answer:

122.5 units

Step-by-step explanation:

The proportion would be between the perimeters and the given ratio:

7/2 = p/p

Where P is the perimeter of the bigger figure and p is the perimeter of the smaller figure.

Remember that the perimeter is the sum of all sides, using all given values and solving for P, we have

7/2=P/9+5+9+12

7/2=P/35

7(35)/2=P

P=245/2=122.5

Therefore, the perimeter of Figure A is 122.5 units.

Factorize completely 25x^2-90x+81

Answers

Answer:

Factor using the perfect square rule.

( 5 x + 9 ) ^2

HOPE THIS HELPS!!!

Step-by-step explanation:

OPEN PERENTHESIS FIVE X PLUS NINE CLOSED PERENTHESIS TO THE SECOND POWER

how much are these coins worth?

Answers

Answer:

Step-by-step explanation:

1.65

Things how much there worth

Hope it helps

Find the difference.

89 – 52.05
A. 36.95
B. 35.95
C. 37.95
D. 37.05

Answers

The answer your looking for is A. 36.95
Just calculate 89-52.05 into a calculator not that hard lol

Gabriel is 12 years old, and his younger brother Elias is 2 years old.
How old will each of them be when Gabriel is twice as old as Elias?

Answers

Gabriel will be 20, Elias will be 10

We can use an equation to map out and solve for each age.

Years gone by = x

12+x=2(2+x)

12+x=4+2x

x=8

12+8=20, 2+8 =10

• The perimeter of a rectangular field is 118 meters.
• The width of the field is 19 meters shorter than the length.
What is the length, in meters, of the field?

Answers

Answer:

101 meter

Step-by-step explanation:

I think

21 feet of yarn costs $42.70. What is the price per yard?

Answers

divide the numbers and you will get your answer.

Consider these functions:

f(x) = 2x3 + 3

g(x) = x – 4

What is the value of g(f(x))?

Answers

Answer:

2x^3+3-4

Step-by-step explanation:

Answer:

2x^3 - 1

Step-by-step explanation:

Plato/Edmentum

ILL GIVE BRAINLESS HELP! Would appreciate u say how u got it

Answers

Answer:

114+18=132

Step-by-step explanation:

What is the x-intercept of the graph that is shown below?
(-2,0)
(-1,2)
(0,4)
(4,0)

Answers

The X intercept would be (-2, 0)
(-2,0)
X,Y
X will always be the number of the horizontal line and Y always on vertical

Someone answer this for me

Answers

Answer:

2 3/4

Step-by-step explanation:

I think is the right answer hope it helps

Twelve plus the product of twelve and a number is seventy-two.”

Answers

The equation for this problems is 12+12x=72. The solution to the equation is x=5.


Steps:
12+12x=72
Minus 12 from both sides

12x=60
Divide both sides by 12

60/12=5

Pls. Help me!!!!!!!!!!!!!!!!!!

Answers

Answer:

d i think

Step-by-step explanation:

Answer: C

Step-by-step explanation:

our points are

(0, 64) and (17, 30)

slope = 30-64/17-0 = -34/17 = -2

y=-2x+64 aka C

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