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
Ne4ueva [31]
2 years ago
5

In a study, researchers wanted to measure the effect of alcohol in the development of the hippocampal region in adolescents. The

researchers randomly selected 30 adolescents with alcohol use disorders to compare the hippocampal volumes in the alcoholic adolescents to the normal volume of 9.08 cubic centimeters. An analysis of the sample data revealed that the hippocampal volume was distributed normally with a mean of 8.25 cm^3 and a standard deviation of 1.67 cm^3.
a. The researchers wanted to determine if the hippocampal values in the alcoholic adolescents were different from the normal volume of 9.08 cm. Write the null and alternative hypotheses for this question. Use a t critical value of 2.045.
b. What are the assumptions (conditions) of this test? Are the assumptions met for this sample?
c. Perform the appropriate test including the formula that you used, the calculated value of the t-statistic, and the t-critical you compared your t-statistic to using a significance level of .05. Then, state your conclusion to the test.
d. Calculate and interpret the 95% confidence interval for the test. Use a t critical of 2.045.
Mathematics
1 answer:
lbvjy [14]2 years ago
4 0

Answer:

Kindly check explanation

Step-by-step explanation:

Given :

Sample size, n = 30

Tcritical value = 2.045

Null hypothesis :

H0: μ = 9.08

Alternative hypothesis :

H1: μ≠ 9.08

Sample mean, m = 8.25

Samole standard deviation, s = 1.67

Test statistic : (m - μ) ÷ s/sqrt(n)

Test statistic : (8.25 - 9.08) ÷ 1.67/sqrt(30)

Test statistic : - 0.83 ÷ 0.3048988

Test statistic : - 2.722

Tstatistic = - 2.722

Decision region :

Reject Null ; if

Tstatistic < Tcritical

Tcritical : - 2.045

-2.722 < - 2.045 ; We reject the Null

Using the α - level (confidence interval) 0.05

The Pvalue for the data from Tstatistic calculator:

df = n - 1 =. 30 - 1 = 29

Pvalue = 0.0108

Reject H0 if :

Pvalue < α

0.0108 < 0.05 ; Hence, we reject the Null

You might be interested in
If you have the points (100,3.5), (200,7), (300,10.5), (400,14), (500,17.5). What is the function B(x)?
jeka57 [31]
The function rule is B(x)=0.035x
7 0
3 years ago
@jdoe<br><br> As promised. The link will be whatever.
Lady_Fox [76]
Ok, so we see in
y=a(x-h)^2+k
vertex is (h,k)
vertex is highest or lowest point
on one side, it goes up and other side it goes down

if a is positive, then it goes down then up
if a is negative, it goes up then down

we see
f(x)=2(x+3)^2+2
2 is positive
goes down then up
vertex is (-3,2)

so decreases from -infinity to -3 or ininterval
(-infinity,-3)

answer is first option
6 0
3 years ago
Please help me with number 9
Mrrafil [7]
The answer is 8 pints
8 0
3 years ago
Based on one of the Triangle Congruence Postulates, the two triangles are shown are congruent
tankabanditka [31]

Answer:

true

Step-by-step explanation:

all the sides match up. One side (the base) is shared which means they are the same length. The triangle at the top has a single hash on a side and so does the bottom one. This means they are the same length. The same thing occurs with the last remaining sides, they are congruent because they both have two hash lines. Since all three sides of both triangle add up, the triangles ARE CONGRUENT.

3 0
3 years ago
Hellp plsssss<br><br> I would love it if you did!
Shtirlitz [24]

Answer:

1050

Step-by-step explanation:

bylon 3 x 68 =204

wool (3x3) x 94 =846

204 + 846 = 1050

he spent 1050 $ on materials

7 0
2 years ago
Read 2 more answers
Other questions:
  • Predict the miles traveled in 5 hours at a rate of 189 miles in 3 hours
    14·1 answer
  • How do i write an exponential equation with a vertical asymptote other that y=0
    11·1 answer
  • How much more is 10,245 than 6,769
    11·2 answers
  • Hailey works at a gift shop after school. She is paid $10 per hour plus 15% commission on merchandise she sells. Select an equat
    9·1 answer
  • . Первый мастер может выполнить задание,
    6·1 answer
  • glen rolls a 6 sided die what is the probability that he gets a number greater then 2 or an odd number​
    9·1 answer
  • 1.7a + 0.3a = 4/5<br><br> Please help....
    14·2 answers
  • Find the slope of a line perpendicular to a line through the given points.. . E(5, 7), F(3 , 1)
    11·2 answers
  • Show work please !!!
    12·1 answer
  • 3y + 2 = -6x <br><br>in slope-intercept form : y=mx+b<br>oh and please show work! Thank youuu
    13·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!