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
adoni [48]
2 years ago
10

HELP !!!I am being timed !!!!

Mathematics
1 answer:
wolverine [178]2 years ago
7 0

Answer:x = -8

Step-by-step explanation:

You might be interested in
Which of the given lengths make a right triangle?
lana66690 [7]

Answer:

aaaaaaaaaaaaaaaaaaaaa

7 0
2 years ago
The average yield of the standard variety off soybeans per acre on a farm in a region is 48.8 bushels per acre, with a standard
I am Lyosha [343]

Answer:

z=\frac{53.4-48.8}{\frac{12}{\sqrt{36}}}=2.3  

p_v =P(Z>2.3)=1-P(Z  

If we compare the p value and the significance level given \alpha=0.01 we see that p_v>\alpha so we can conclude that we have enough evidence to FAIL to reject the null hypothesis, so we can conclude that the true mean is not significantly higher than 48.8 at 1% of signficance.  

Step-by-step explanation:

1) Data given and notation  

\bar X=53.4 represent the sample mean

\sigma=12 represent the population standard deviation assumed

n=36 sample size  

\mu_o =48.8 represent the value that we want to test  

\alpha=0.01 represent the significance level for the hypothesis test.  

z would represent the statistic (variable of interest)  

p_v represent the p value for the test (variable of interest)  

2) State the null and alternative hypotheses.  

We need to conduct a hypothesis in order to check if the true mean is higher than 48.8, the system of hypothesis would be:  

Null hypothesis:\mu \leq 48  

Alternative hypothesis:\mu > 48  

Since we assume that know the population deviation, is better apply a z test to compare the actual mean to the reference value, and the statistic is given by:  

z=\frac{\bar X-\mu_o}{\frac{\sigma}{\sqrt{n}}} (1)  

z-test: "Is used to compare group means. Is one of the most common tests and is used to determine if the mean is (higher, less or not equal) to an specified value".  

3) Calculate the statistic  

We can replace in formula (1) the info given like this:  

z=\frac{53.4-48.8}{\frac{12}{\sqrt{36}}}=2.3  

4)P-value  

Since is a right tailed test the p value would be:  

p_v =P(Z>2.3)=1-P(Z  

5) Conclusion  

If we compare the p value and the significance level given \alpha=0.01 we see that p_v>\alpha so we can conclude that we have enough evidence to FAIL to reject the null hypothesis, so we can conclude that the true mean is not significantly higher than 48.8 at 1% of signficance.  

3 0
3 years ago
A bracelet is now reduced to £600. This is 80% of the original price.
Tems11 [23]

Answer:

the original is 1080.

Step-by-step explanation:

80%×600=480

480+600=1080

5 0
3 years ago
Read 2 more answers
Ms. Wilson surveyed her class of 36 students about their favorite ice cream flavors.
ruslelena [56]

Answer:

1 student.

Step-by-step explanation:

Two thirds of the students preferred chocolate ice cream:

2/3 of 36 is 24 students.

One fourth of the students preferred strawberry ice cream:

1/4 of 36 is 9.

9+24= 35

<em>--------------------------------------------------------------------------------------</em>

36-35=1

Only one student preferred vanilla ice-cream.

7 0
2 years ago
Read 2 more answers
A box contains
Alex787 [66]
I'm not entirely sure but it should be (3/5) together. For pen the probability is (5/20) and for crayon is (12/20) add them equals (12/20) simply equals (3/5) HOPE IT HELPS
4 0
3 years ago
Other questions:
  • An oil exploration company purchases drill bits that have a life span that is approximately normally distributed with a mean equ
    11·1 answer
  • I need help with the puzzle plsssss it’s due Wednesday!
    14·2 answers
  • CAN SOMEONE HELP ME PLEASE!
    8·1 answer
  • The ratio of the number of coins to the number of notes Mrs James has in her purse is 2 : 5.
    8·1 answer
  • Which transformation can be used to prove Similarity and why?
    6·1 answer
  • Non proportional or proportional
    9·1 answer
  • Sonny has $200. Each game he buys online costs $.99. After buying some games he has $178.22 left. How many games did he buy?
    5·1 answer
  • one school purchased 18 gallons of blue paint to decorate several of its classrooms. if each classroom needs 1 4/5 gallons of pa
    12·1 answer
  • 14. Devon has an area rug with a width 3 feet less than its length, l. He has purchased a larger rug to fit into his new dorm ro
    15·1 answer
  • How many triples of three positive integers have a product of 16?
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!