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
PSYCHO15rus [73]
2 years ago
15

Explain how to perform a​ two-sample z-test for the difference between two population means using independent samples with sigma

1 and sigma 2 known.
Mathematics
1 answer:
Rom4ik [11]2 years ago
5 0

Answer:

Step-by-step explanation:

In the two independent samples application, it involves the test of hypothesis that is the difference in population means, μ1 - μ2. The null hypothesis is always that there is no difference between groups with respect to means.

Null hypothesis: ∪₁ = ∪₂. where ∪₁ represent the mean of sample 1 and ∪₂ represent the mean of sample 2.

A researcher can hypothesize that the first mean is larger than the second (H1: μ1 > μ2 ), that the first mean is smaller than the second (H1: μ1 < μ2 ), or that the means are different (H1: μ1 ≠ μ2 ). These ae the alternative hypothesis.

Thus for the z test:

    if n₁ > 30 and n₂ > 30

     z = X₁ - X₂ / {Sp[√(1/n₁ + 1/n₂)]}

where Sp is √{ [(n₁-1)s₁² + (n₂-1)s₂²] / (n₁+n₂-2)}

You might be interested in
20POINTS! Determine if two triangles are congruent. If they are, state which theorem you can use to prove congruency. EXPLAIN WH
ki77a [65]

Answer:

both each side of each triangle is equal

use alphabets to mark each edge of the triangles and prove congruency

6 0
2 years ago
Read 2 more answers
Find any values of the variable for which each rational expression is undefined. Write answers with the symbol ≠.
astra-53 [7]

Answer:

x \neq 3

Step-by-step explanation:

if  x = 3 then  the rational expression    4 / (x - 3) is undefined

because we get   4/0 = undefined .

4 0
2 years ago
Find the mode of the following: 75, 93, 89, 75, 84
liberstina [14]

Answer:

75

Step-by-step explanation:

The mode is the number that appears most often. Because 75 appears twice and the other numbers only appear once, it is the most used number.

4 0
3 years ago
Read 2 more answers
A stock-car race lasted 2.07 hours. how many seconds did the race last?
kolezko [41]
2.07 hr x  \frac{60 min}{1 hr} x  \frac{60 sec}{1 min} = 7452 sec
8 0
3 years ago
Need simplified please
Romashka-Z-Leto [24]

Answer:

70

Step-by-step explanation:

7^2 - ( 6-3^3)

PEMDAS

Parentheses first

7^2 - ( 6-3^3)

The exponent in the parentheses first

7^2 - ( 6-27)

7^2 - ( -21)

Now the exponent

49 - (-21)

Now subtract

49 +21

70

6 0
2 years ago
Other questions:
  • Is 39 a prime or composite number
    8·2 answers
  • WILL MARK THE BRAINIEST PLZ HELP NOW!!! LOTS OF POINTS Determine how many solutions there are and if there are solutions solve f
    6·1 answer
  • HELP NOW PLEASE!<br>What is the volume of a cube with length 8 feet? <br>V=lwh   <br><br> _ft³
    10·1 answer
  • En una reunión de 40 viejos piratas, 1/5 tenían una pata de palo y los 3/4 de ellos habían navegado en El Corsario. ¿Cuántos pir
    5·1 answer
  • Find the product of 7xy and x to the 14th z
    10·1 answer
  • Select all that apply
    14·1 answer
  • Help me with 1 2 and 3 please
    9·1 answer
  • Estimate 0.00001377 as the product of a single digit number times a power of 10.
    9·1 answer
  • A polynomial function has roots of -5,2 and 7
    6·1 answer
  • PLEASE HELPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPP
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!