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
alexgriva [62]
2 years ago
10

6. A psychology professor of a large class became curious as to whether the students who turned in tests first scored differentl

y from the overall mean on the test. The overall mean score on the test was 75 with a standard deviation of 10; the scores were approximately normally distributed. The mean score for the first 20 students to turn in tests was 78. Using the .05 significance level, was the average test score earned by the first 20 students to turn in their tests significantly different from the overall mean?
Mathematics
1 answer:
grigory [225]2 years ago
6 0

Answer: Z is less than Zc ∴ 1.342 < 1.96

Therefore, Null hypothesis is not Rejected.

There is no sufficient evidence to claim that students turning in their test first score is significantly different from the mean.

Step-by-step explanation:

Given that;

U = 75

X = 78

standard deviation α = 10

sample size n = 20

population is normally distributed

PROBLEM is to test

H₀ : U = 75

H₁ : U ≠ 75

TEST STATISTIC

since we know the standard deviation

Z =  (X - U) / ( α /√n)

Z = ( 78 - 75 ) / ( 10 / √20)

Z = 1.3416 ≈ 1.342

Now suppose we need to test at ∝ = 0.05 level of significance,

Then Rejection region for the two tailed test is Zc = 1.96

∴ Reject H₀ if Z > Zc

and we know that Z is less than Zc ∴ 1.342 < 1.96

Therefore, Null hypothesis is not Rejected.

There is no sufficient evidence to claim that students turning in their test first score is significantly different from the mean.

You might be interested in
2cos(3pi/4) – 4 sin(7pi/6)
dangina [55]

Answer:

0.58578643762

Step-by-step explanation:

7 0
3 years ago
How do you solve -x/6 &gt; 3?
Lerok [7]

Answer:

Using Math.

Step-by-step explanation:

You solve it using math.

See, you should have been more specific with your question, maybe said "What is the answer" not "How do I solve".

But I guess I'll help you out bro

<em>Multiply</em> both sides by 6

that gives you -x>18

then <em>multiply</em> both sides by -1

which means you gotta <u>flip the sign</u>

so final answer is x<-18

4 0
3 years ago
PLEASE HELP ME!!!
wlad13 [49]
It could be C or D but a salary is a fixed payment that is USUALLY on a yearly payment. I would answer D
3 0
3 years ago
Read 2 more answers
Simplify 2 root 3 x 3 root 8
scZoUnD [109]

Answer:

<h3>12√6</h3>

Step-by-step explanation:

Given the expression;

2√3 * 3√√8

= (2*3) * (√3*√8)

= 6 * (√24)

= 6 * √4*6

= 6 * (2√6)

= (6*2)√6

= 12√6

Hence the simplified form of the expression is 12√6

8 0
2 years ago
What is the greatest common factor of 10 and 50
brilliants [131]
The greatest number common to 50 and 10 is 10 10 is the answer hope this helps
5 0
3 years ago
Read 2 more answers
Other questions:
  • the area of a rectangle is 56 square inches. the width of the rectangle is 7 in. What is the length?
    5·1 answer
  • If x-15=30,what is the value of 2(x 5)
    6·1 answer
  • Manny made 4 pizzas to share among himself and 6 friends.
    5·1 answer
  • A ball has a radius of 18 cm.
    9·1 answer
  • Graph the image of the given segment under a di6with scale factor -1/3 and center of dilatation (0,0). Line on graph is A (-6,9)
    11·1 answer
  • Greatest common factor of 8x and 40?
    7·2 answers
  • Devon has $200 in his savings account. He has to withdraw $8 every week to pay his friend back for some video games. The video g
    15·1 answer
  • Multiple choice (you can choose more than one)
    15·1 answer
  • Diagram NOT
    10·1 answer
  • In austin texas, 8 bats ate 40 grams of insects in one night. At this rate how many grams of insects could 64 bats eat in 1 nigh
    14·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!