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
zalisa [80]
3 years ago
13

Calculate a critical z-score for a left-tailed, right-tailed, or two-tailed test.

Mathematics
1 answer:
muminat3 years ago
4 0

Answer:

a. Z = -1.175.

b. Z = 1.34.

c. |Z| = 2.054.

d. |Z| = 1.28.

Step-by-step explanation:

Z-score:

In a set with mean \mu and standard deviation \sigma, the z-score of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the p-value, we get the probability that the value of the measure is greater than X.

a. The critical z-score for a left-tailed test at a 12% significance level

Left-tailed test: The region of interest is the 12th percentile or below.

Thus, the critical z-score is Z with a p-value of 0.12, so Z = -1.175.

b. The critical z-score for a right-tailed test at a 9% significance level

Right-tailed test: The region of interest is the 100 - 9 = 91th percentile and above.

Thus, the critical z-score is Z with a p-value of 0.91, so Z = 1.34.

c. The critical z-score for a two-sided test at a 4% significance level is 1.75.

Two-tailed test: The region of interest is between the 4/2 = 2th percentile and the 100 - (4/2) = 98th percentile.

Thus, the critical z-score is |Z| with a p-value of 0.02 or 0.98, so |Z| = 2.054.

d. The critical z-score for a two-sided test at a 20% significance level is 0.85.

Region of interest is between the 20/2 = 10th percentile and the 100 - (20/2) = 90th percentile.

Thus, the critical z-score is |Z| with a p-value of 0.1 or 0.9, so |Z| = 1.28.

You might be interested in
F(x) = -1/4x + 2 what Is the domain <br>​
eimsori [14]

Answer:

I'm not good with this stuff myself... lol

Step-by-step explanation:

All real numbers. X€R

4 0
3 years ago
Which rational exponent represents a square root?
Viefleur [7K]

Answer:

1/2 rational exponent represents a square root.

Step-by-step explanation:

Because it is an example of a true square root.

7 0
2 years ago
Mr. Sanchez’s class sold fruit pies for $1.55 each and Mr. Kelly’s class sold bottles of fruit juice for $1.40 each. Together, t
Blababa [14]

Answer:

x + y = 60 and 1.55x + 1.4y = 88.20 and the solution is x = 32 and y = 28.

Mr. Sanchez’s class earned more money by $10.4.

Step-by-step explanation:

Mr. Sanchez’s class sold fruit pies for $1.55 each and Mr. Kelly’s class sold bottles of fruit juice for $1.40 each.

Let the number of sold fruit pies is x and bottles of fruit juice is y.

So, from the given condition we can write

x + y = 60 ........ (1)

⇒ 1.4x + 1.4y = 84 ....... (2) and

1.55x + 1.4y = 88.20 ........ (3)

Now, solving equations (2) and (3) we get (1.55 - 1.4)y = (88.2 - 84)

⇒ y = 28

And from equation (1) we get x = 60 - 28 = 32.

Therefore, Mr. Sanchez’s class earned more money. (Answer)

Now, this class have earned $(32 × 1.55 - 28 × 1.4) = $10.4 more. (Answer)

5 0
3 years ago
Read 2 more answers
Is anyone still in class, if you are can we do a troll? This is how it will work give me a zoom link, password, and meeting Id.
Anit [1.1K]

Answer:

Some zoom classes are designated for certain emails like my schools so I don't think it will work out like that.

Step-by-step explanation:

Can I have brainliest? It would help me out, if not thanks anyways! Hope this helped and have a nice day!

4 0
3 years ago
Enter an algebraic expression for the word expression.<br>The quotient of -4 and y​
Morgarella [4.7K]

Hey there!

Guide to follow

“Difference” means subtract

“Is” means equal to

“Product” means multiply

“Quotient” means divide

“Sum” means add

Answering your question….

“The [QUOTIENT] of [-4] and [y]

Remember we said “quotient” means divide

So we’re dividing -4 from y and that will be your answer.

Answer

-4 ÷ y

Good luck on your assignment and enjoy your day!

~Amphitrite1040:)

7 0
2 years ago
Other questions:
  • 25, 8, 10, 35, 5, 45, 40, 30, 20 What is the upper quartile of the data set above?A.35
    12·1 answer
  • What is 8 times -8/9
    12·2 answers
  • A rectangle of length 10 units and width 5 units is shown. Inside this rectangle is another rectangle of length 9 units and widt
    8·2 answers
  • Y=5x^3-3 {x=+_6} construct the data table
    5·1 answer
  • How can you write 310,763,163 in word form
    8·1 answer
  • How much is 45 minutes plus 45 minutes
    5·2 answers
  • What is 64,569 rounded off to the nearest thousand
    12·1 answer
  • PLSSSSSSSSS HELP answer back please fast within an hour!!!!!!!
    13·2 answers
  • Now suppose instead that Jane withdraws $500 from her checking account and uses $300 of this money to pay her federal income tax
    15·1 answer
  • The ratio of dogs to cats is 3 to 8. if there are 294 dogs, how many cats are there?
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!