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
stealth61 [152]
2 years ago
6

Suppose that Jean studied for the Graduate Management Admission Test (GMAT) using a well-known preparation class and was thrille

d to receive a total score of 740. Her friend Eric, however, thinks she would have scored just as well without the class. To test the efficacy of the class, they obtain a small but random sample of 17 test results from other students using the same class. This sample's average is 559.42 with a standard deviation of 108.03. In comparison, the national average was 550.12. Assume the population's results are normally distributed but that its standard deviation is not known. Jean and Eric decide to perform a two-tailed t‑test at a significance level of α = 0.05. How many degrees of freedom should they use in their calculations? df = ___.
Mathematics
1 answer:
vlabodo [156]2 years ago
4 0

Answer:

Her friend Eric, however, thinks she would have scored just as well without the class, is proved at 5% significance level

Step-by-step explanation:

Given that sample size is 17 and distribution is normal

Since sima, population std dev is not known, we can use only t test.

Set hypotheses as

H_0:\bar x= 550.12\\H_a: \bar x>550.12

(Right tailed test)

\bar x= 559.42\\s =108.03\\\mu = 550.12

Mean difference = 559.42-550.12=9.30

Std error of sample mean = s/square root of n

= \frac{108.03}{\sqrt{n-1} } =27.01

Test statistic t = mean diff/std error

= 0.3443

df = 16

p value = 0.369

Since p >0.05, at 5% significant level we conclude that there is no significant difference because of attending preparatin class.

You might be interested in
Box A has a volume of 24 cubic meters. Box B is similar to Box A. To create Box B, Box A's dimensions were multiplied by 4. What
Paraphin [41]

Answer: 1536\ m^3

Step-by-step explanation:

Given

Box A has a volume of 24\ m^3

Box B is similar to box A such that box A dimension is multiplied by 4 to get the box B

So, each length is 4 times the box A and volume is the cube of the side.

Thus, the volume of box B is 4\times 4\times 4 the volume of box A

The volume of box B is  

=4\times 4\times 4\times 24\\=1536\ m^3

4 0
2 years ago
I’m sort of new to this app so Idk how to give extra points, but I would appreciate it if you could help
Anastasy [175]
Answer: no solution

explanation:
first, use distributive property so 3(n+4)=1/2(6n+4) becomes 3n+12=3n+4

secondly, subtract 12 on both sides to get 3n=3n-8

then, subtract 3n on both sides to get 0= -8

this is false because 0 does NOT equal -8. therefore, the answer is no solution
4 0
3 years ago
Please help i will give you brainlist
____ [38]

Answer for Part A:

Elena makes more money than Jada does. Elena makes $1.40 more than Jada does.

Explanation for Part A:

The equation for Elena tells us that she makes $8.40 per hour. Jada makes $7 an hour. Since 8.4 > 7, Elena makes more money than Jada per hour

6 0
3 years ago
Charles rolled a number cube labeled from 1 to 6. What is the probability that he will roll a number greater than 2? in a fracti
arlik [135]

Answer:

4/6 or 2/3

Step-by-step explanation:

There are 4 numbers greater than 2 and less than or equal to 6, meaning that to roll a number greater than six, he has a 4/6 chance.

5 0
2 years ago
Read 2 more answers
Calculate the area of a circle whose diameter is 156 square​
Readme [11.4K]
7.00
Explanation:
Area of a circle
A
=
π
r
2
, where r is the radius.
Given
A
=
154
,
⇒
154
=
π
⋅
r
2

⇒
r
2
=
154
π
=
49.02
⇒
r
=
√
49.02
=
7.00
4 0
3 years ago
Other questions:
  • Can anyone help?? I don't understand.
    10·1 answer
  • For a new customer, a video store charges $10 for a rental card plus $2 per movie. Write and solve a linear equation to find the
    9·1 answer
  • Score: 7.5/50
    7·1 answer
  • The difference in the x-coordinations of two points is 3, and the difference in the y-coordinations of the two points is 6. What
    15·2 answers
  • What does the symbol ∈ mean
    13·1 answer
  • Help me please !
    14·2 answers
  • Which value is equivalent to 8 multiplied by 4 multiplied by 2 whole over 8 multiplied by 7, the whole raised to the power of 2
    14·2 answers
  • Aubrey walks 15 miles in 4 hours at what unit rate does Aubrey walk?
    8·2 answers
  • Part 2! Please help once again! This is confusing me since I've never been good at geo. :((
    6·1 answer
  • Rohan is writing a 10 page paper about communism he has written a half of a page in 45 minutes at this pace how long will it tak
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!