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
Sonja [21]
2 years ago
9

In a​ study, researchers wanted to measure the effect of alcohol on the hippocampal​ region, the portion of the brain responsibl

e for​ long-term memory​ storage, in adolescents. The researchers randomly selected 23 adolescents with alcohol use disorders to determine whether the hippocampal volumes in the alcoholic adolescents were less than the normal volume of 9.02 cm3. An analysis of the sample data revealed that the hippocampal volume is approximately normal with no outliers and x=8.16 cm3 and s=0.7 cm3. Conduct the appropriate test at the α=0.01 level of significance.
Mathematics
1 answer:
Anton [14]2 years ago
4 0

Answer:

We do not reject the Null Hypothesis

Step-by-step explanation:

From the question we are told that:

Sample size n=23

Population mean \mu=9.02cm^3

Sample mean \=x=8.16

Standard deviation \sigma=0.7cm^3

Significance level \alpha =0.01

Generally the Null and and alternative Hypothesis are as follows

 H_0:\mu=9.02cm^3

 H_a:\mu

Therefore t critical Value is

 t\ critical\ Value=(\alpha,df)

 t\ critical\ Value=(0.01,22)

Where

  df=n-1\\\\df=23-1=>22

Therefore

From t Table

 t value=-2.8

Generally the equation for Z Critical is mathematically given by

 t=\frac{\=x-\mu}{\frac{\sigma}{\sqrt{n} } }

 t=\frac{8.16-9.02}{\frac{0.7}{\sqrt{23} } }

 t=-5.89

Therefore

Since the t test statistics is greater than the Critical value

Hence,we do not reject the Null Hypothesis

You might be interested in
X^2-16x+64=-8 take the square root of both sides
dimulka [17.4K]
I think the answer is x2 +64 but I hope you get it right good luck ! I hope it is 64 thanks
3 0
3 years ago
6 • 14 - (9 + 8) 2 =
Nataly [62]

Answer:

50

Step-by-step explanation:

For this question you would follow the BIDMAS rule - (Brackets, Indices, Division, Multiplication, Addition, Subtraction.)

The first thing in this question you need to solve it (9 + 8)

we do this because, when we follow BIDMAS, the first rule is brackets

so, 9 + 8 = 17

The second step is to multiply, as this rule is second,

so, 17 x 2 = 34

Our final step is to solve the last bit, which is 6 x 14

and we know that 6 x 14 = 84

So now that we have 84 and 34, we need to subtract the two numbers as shown,

84 - 34 = 50

And this is how you get the answer 50

i hope this has helped you, please comment if you did not understand it and i will explain it in another way : )

4 0
3 years ago
Read 2 more answers
Kaylee drove her scooter at an average speed of 15 miles per hour. Sophia drove her scooter at an average speed of 10 miles per
maksim [4K]

Answer:

Kaylee drove her scooter for 2h and Sophia drove her scooter for 3h.

Step-by-step explanation:

From the graph shown below, we can see that the intersection point is (2,3). When using the graphing method to solve a system of equations, the intersection point is the answer. In this case, x = 2 and y = 3.

Thus, Kaylee drove her scooter for 2h and Sophia drove her scooter for 3h.

5 0
3 years ago
What is 0.05 is 10 as much as
aksik [14]

Answer:

0.005

Step-by-step explanation:

5 0
2 years ago
Each side of a square is increasing at a rate of 2 cm/s. at what rate is the area of the square increasing when the area of the
faltersainse [42]
Let x(t) =  the length of a side of the square (cm) at time t (s).
The rate of change of x is given as
\frac{dx}{dt} =2 \,  \frac{cm}{s}

The area (cm²) at time t is 
A = x²

The rate of change of the area with respect to time is
\frac{dA}{dt} = \frac{dA}{dx}  \frac{dx}{dt} =2 \frac{dA}{dx} =2(2x)=4x \,  \frac{cm^{2}}{s}

When A = 9 cm², then x = √9 = 3cm. Hence obtain
\frac{dA}{dt} = 4(3) = 12 \,  \frac{cm^{2}}{s}

Answer: 12 cm²/s

3 0
2 years ago
Other questions:
  • A rectangular park has an area of 250 square feet. The length of the park is 7 feet more then twice the width, w of the park. Wh
    9·2 answers
  • Ryan makes 65 ounces of apple jelly. He puts the same amount of jelly into 6jars. About how much jelly is in each jar?
    13·1 answer
  • 240 televisions of a store are are high definition. These 240 televisions make up 80% of the televisions. How many televisions a
    6·1 answer
  • Identify the coefficient of <br> -24×7y
    7·2 answers
  • The original price was $60 and the new sales price is $45. What is the percent discount?
    7·2 answers
  • A conical container can hold 120π cubic centimeters of water. The diameter of the base of the container is 12 centimeters.
    12·2 answers
  • 1. Complete the square to form a perfect square trinomial. 8x + x² + __
    14·1 answer
  • I had fell asleep but this for the nikkas det wanted to see what i look like &lt;3
    11·1 answer
  • Which pair of expressions is not equivalent? A 3(2a + 5) and 6a + 15 B. 4x – 7 + 5x + 5 and 9x + 12 0. C. 80 - 6) and 8j – 48 D.
    7·1 answer
  • 8 1/2 - 6 1/4 please subtract
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!