1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Fudgin [204]
3 years ago
11

Two random samples of 40 students were drawn independently from two populations of students. Assume their aptitude tests are nor

mally distributed and assume the variances of each sample are equal. The following statistics regarding their scores in an aptitude test were obtained: x with bar on top subscript 1 equals 76 comma space s subscript 1 equals 8 comma space x with bar on top subscript 2 equals 73 comma space s subscript 2 equals 7. Test at the 5% significance level to determine whether we can infer that the two population means differ. What is the conclusion from your test? a. None of these answers are correct b. Do not reject the null hypothesis c. Do not accept the null hypothesis d. Accept the alternate hypothesis e. Reject the null hypothesis
Mathematics
1 answer:
dybincka [34]3 years ago
7 0

Answer:

b. Do not reject the null hypothesis

Step-by-step explanation:

Given that two random samples of 40 students were drawn independently from two populations of students.  Assuming equal variances

we have the following data.

Sample 1

Mean:  

76

 

Standard deviation:  

8

 

Sample size:  

40

 

Sample 2

Mean:  

73

 

Standard deviation:  

7

 

Sample size:  

40

H_0: \bar x_1=\bar x_2\\H_a:  \bar x_1\neq \bar x_2

Difference -3.000

Standard error 1.681

95% CI -6.3462 to 0.3462

t-statistic  -1.785

DF  78

Significance level P = 0.0782

Since p value >0.05,

b. Do not reject the null hypothesis

You might be interested in
(50 points & Will give brainliest)
sweet-ann [11.9K]

Answer:

x = 3 , y = 13

Step-by-step explanation:

Note that both equations is equal to y. Set the two equations equal to each other

y = 7x - 8; y = 5x - 2

7x - 8 = y = 5x - 2

7x - 8 = 5x - 2

Isolate the x. Subtract 5x and add 8 to both sides

7x (-5x) - 8 (+8) = 5x (-5x) - 2 (+8)

7x - 5x = -2 + 8

Simplify.

(7x - 5x) = (-2 + 8)

2x = 6

Isolate the x. Divide 2 from both sides

(2x)/2 = (6)/2

x = 6/2

x = 3

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

Plug in 3 for x in one of the equations.

y = 7x - 8

y = 7(3) - 8

Simplify. Remember to follow PEMDAS.

y = 7(3) - 8

y = 21 - 8

y = 13

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

x = 3, y = 13 is your answer

~

4 0
3 years ago
What is the equation
Varvara68 [4.7K]
I bealive if it is the nature of the slope in unison comparing y-intercept elgebra it is  Y=3x-3/4
8 0
3 years ago
Write a proportion and then solve to find the missing measure of the reduced rectangle. What two ratios can be used in the propo
lions [1.4K]

Answer:

What two ratios can be used in the proportion?

8/3 and 18/x

What is the value of a missing measure?

6.75 in.

Step-by-step explanation:

im right trust me. im just cool like that.

8 0
3 years ago
Need help plz !!!!!!!<br> Due today
Serggg [28]

Answer:

I know a little of this

Step-by-step explanation:

ok so what you do is for example take both of the small equation with the same variable and equal them to each other then plug in to the other

ex. 7x-31 =5x-8 solve this the plug what you get into the y in equation 4(y) +27

7 0
3 years ago
Solve for Z 3-4(Z+1)=3Z-(2+Z) Enter you answer as a simple fraction
skelet666 [1.2K]
3 - 4z - 4 = 3z - 2 - z

-4z - 1 = 2z - 2

2z + 4z = -1 + 2

6z = 1

z = 1/6

Hope this helps!
5 0
3 years ago
Read 2 more answers
Other questions:
  • Alright, this a Honors Geometry question:
    14·1 answer
  • Jeffrey opened a savings account with $15,000. His annual interest rate is 4.8%, and his interest is compounded quarterly. How m
    12·1 answer
  • For a two week period, John and Amanda had the following transactions occur to their checking account: a deposit of $1,644.50; c
    5·2 answers
  • Composite figures are two or more figures combined. When finding the surface area, you cannot simply find the separate surface a
    9·2 answers
  • Moment = Force x distance (M=F* d)
    7·1 answer
  • How many times doe 56 go into 512
    10·2 answers
  • A gym membership charges an initial
    12·1 answer
  • 1/2 litre of kerosene costs $1.50what is the cost ofn2 litre of kerosene​
    7·2 answers
  • HELPPPPPPPP 7TH GRADE MATH
    9·1 answer
  • What is the value of x? ​
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!