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sweet-ann [11.9K]
3 years ago
12

A real estate agent is working for a developer who claims that the average commute time to downtown is 20 minutes with a standar

d deviation of 7 minutes. Stephon is an independent real estate agent and wants to check the times for his client. He took a random sample of 15 commute times and found an average of 26 minutes. He did hypothesis testing using a significance level of 5%. Which conclusion could he make?
Mathematics
2 answers:
vova2212 [387]3 years ago
8 0

the answer is C. the z- statistic is 3.32, so the null hypothesis should be rejected.

torisob [31]3 years ago
4 0

To calculate the z-statistic, we must first calculate the standard error.

Standard error is standard deviation divided by the square root of the population. In this case, it is equal to 1.81.

The z-score is defined the distance from the sample to the population mean in units of standard error.

z = (26 – 20)/1.81 = 3.31

at this z-score = 0.0005 which is less than 5%

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On a piece of paper , graph f(x)=2^x then determine which answer choice matches the graph you drew.
amid [387]

Answer:

The graph in the attached figure

Step-by-step explanation:

we have

f(x)=2^x

This is a exponential function of the form

y=a(b^x)

where

a is the initial value or the y-intercept

b is the base of the exponential function

If b>1 then is a exponential growth function

If b<1 then is a exponential decay function

In this problem

The y-intercept is equal to

For x=0

f(x)=2^0=1

The y-intercept is the point (0,1)

so

a=1

b=2

The value of b is greater than 1

so

Is a growth function

To plot the graph create a table with different values of x and y

For x=-1

f(x)=2^-1=0.5

point (-1,0.5)

For x=1

f(x)=2^1=2

point (1,2)

For x=2

f(x)=2^2=4

point (2,4)

For x=3

f(x)=2^3=8

point (3,8)

For x=4

f(x)=2^4=16

point (4,16)

Plot the y-intercept and the other points and connect them to graph the exponential function

Note that as x increases the value of y increases (exponential growth function)

The graph in the attached figure

4 0
4 years ago
Read 2 more answers
Linda bought a cube jewelry box. The volume of the jewelry box is 64 cubic inches. What is the edge length of Linda’s jewelry bo
yawa3891 [41]

Answer:

The edge length will be equal to 4 inches.

Step-by-step explanation:

The volume of a cube = s * s * s (in which s represent side of the cube)

V = s * s * s

V = s³

64 = s³

64 = 4³

So edge length of the cube will be 4 inches.

7 0
3 years ago
How do I solve this equation and check the solutions?
IgorLugansk [536]
<h3>SOLUTION :-</h3>
  • <u>By squaring on both sides :</u>

: \implies  \sf {\big( \sqrt{20 - 8x}  \:\big)}^{2}  = x^2 \\   \\

:\implies  \sf {20 - 8x}  =  {x}^{2}  \\  \\

  • <u>Solving quadratic equation :</u>

: \implies\sf{ {x}^{2} + 8x  - 20 = 0 }   \\  \\

: \implies\sf{ {x}^{2} + (10 - 2)x -  20 = 0 }   \\  \\

: \implies\sf{ {x}^{2} + 10x - 2x -  20 = 0 }   \\  \\

: \implies\sf{ x(x + 10) - 2(x  + 10 )= 0 }   \\  \\

:\implies\sf{( x + 10 )(x - 2)= 0 } \\  \\

: \implies\sf x + 10 = 0 \:  or \: x  - 2 = 0 \\  \\

: \implies\sf x  = 0  - 10\:  or \: x  = 0  + 2\\  \\

: \implies  \underline{\boxed{ \bf{x = - 10 \: or \: x = 2}}}

\huge {\therefore} The roots of this equation are -10 and 2.

3 0
3 years ago
Read 2 more answers
Does the order of quantities in inequality matter
horrorfan [7]
Hey there

The <span>order of quantities in inequality does not matter. </span>
8 0
3 years ago
33pt =__ qt __qt pliz. hurry
Valentin [98]
 <span>16.5 
1 pint(US) = 0.5 quarts (US)</span>
5 0
3 years ago
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