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
Naya [18.7K]
3 years ago
7

It is recommended that adults get 8 hours of sleep each night. A researcher hypothesized college students got less than the reco

mmended number of hours of sleep each​ night, on average. The researcher randomly sampled 20 college students and calculated a sample mean of 7.5 hours per night. If the researcher wanted to perform a​ one-sample t-test, which of the following is a correct​ statement?
A: By taking a random​ sample, the researcher has guaranteed that the distribution of number of hours of sleep per night for all college students is normal.
B.The number of hours of sleep per night for all college students must be normally distributed because the sample size is small.
C.By taking a random​ sample, the researcher has guaranteed that the distribution of sample means is normal.
D.The distribution of sample means will be normal even if the distribution of the data in the population is not normal.
Mathematics
1 answer:
Artist 52 [7]3 years ago
7 0
Things change, rearrange, or so do I
It ain't always for the better dawg, I can't lie
I get high cause the lows can be so cold
I might bend a little bit but I don't fold
One time for my mind and two for yours
I got food for your thoughts to sooth your soul
If you see my tears fall just let me be..
Move along, nothing to see
You might be interested in
P-21=34 P=34-21 P=13<br>What is the value of p?<br>​
vredina [299]

Simplifying

P + -21 + -21 = 34 + -21  

-21 + -21 + P = 34 + -21

Combine like terms: -21 + -21 = -42

-42 + P = 34 + -21

Combine like terms: 34 + -21 = 13

-42 + P = 13

Solving

-42 + P = 13

Solving for variable 'P'.

Move all terms containing P to the left, all other terms to the right.

Add '42' to each side of the equation.

-42 + 42 + P = 13 + 42

Combine like terms: -42 + 42 = 0

0 + P = 13 + 42

P = 13 + 42

Combine like terms: 13 + 42 = 55

P = 55

Simplifying

P = 55

3 0
3 years ago
―6 + (4 + 4)2 ÷ 2<br> This is my problem I need help with
Galina-37 [17]

Answer:

2

Step-by-step explanation:

you do the (* first so it 8 then you add it with -6 which decreases it that makes 2 and 2 divided by 2 is one so add all together and get 2

7 0
2 years ago
Read 2 more answers
An electrical rm manufactures light bulbs that have a life span that is approximately normally distributed. The population stand
stira [4]

Answer:

The 't' test statistic = 1.46 < 1.69

The test of hypothesis is H 0 :μ = 800 is accepted

A sample of 30 bulbs are found came from average µ= 800

Step-by-step explanation:

Step 1:-

Given population of mean μ = 800

given size of small sample n =30

sample standard deviation 'S' = 45

Mean value of the sample χ = 788

Null hypothesis H_{0} =µ  =800

alternative hypothesis  H_{1} = µ ≠ 800

<u>Step 2</u>:-

The 't' test statistic t =  \frac{x-μ}{\frac{sig}{\sqrt{n} } }

                             t = \frac{788-800}{\frac{45}{\sqrt{30} } }

                       t = \frac{12}{8.215} = 1.4607

<u>Step 3</u>:-

The degrees of freedom γ = n-1 = 30-1 =29

From "t" value from table at 0.05 level of significance ( t = 1.69)

The calculated value t = 1.4607 < 1.69

Therefore The null hypothesis H_{0} ' is accepted.

<u>conclusion</u>:-

A sample of 30 bulbs are came found from average µ= 800

7 0
3 years ago
HELP MEEE PLEASEE I WILL MARK BRAINLIEST
Alisiya [41]

Answer:

683

Step-by-step explanation:

4 0
2 years ago
Read 2 more answers
PLEASE PLEASE HELP!!!
nignag [31]

Answer:

Step-by-step explanation:

x^{2} \sqrt{x} \sqrt[n]{x} \frac{x}{y} x_{123} \beta \beta \alpha \neq \geq \\ \left \{ {{y=2} \atop {x=2}} \right.

3 0
3 years ago
Other questions:
  • Solve the equation using mental math 6 and 6/7 sequels and + 5and 3/7
    8·1 answer
  • Will all random samples from a given population have the same mean? Provide an explanation with your answer.
    12·2 answers
  • The perimeters of the square and the triangle shown below are equal. What is the value of x?
    12·1 answer
  • A group of friends are going to a cottage for the weekend and you look at the road map to see where it is. The scale used is 1 :
    14·2 answers
  • The area of two rectangles is given by he functions: area of a rectangle A:f(x)= 4x2+6x area of rectangle B:g(x)=3x2-x Which fun
    15·2 answers
  • Could someone explain this better?
    14·1 answer
  • How to this problem -6a&lt;9+3y&gt;6
    14·1 answer
  • On the trip you and your friends stop for gas and decide to drinks 1.05, and snacks, which are 2.20, if they spend a maximum of
    5·1 answer
  • Angle a and angle b are verticle angles if angel = (2x+26) and angle b = (3x+21) then find rhe measure of angle b
    15·1 answer
  • Given: BD bisects AC and ∠CBE≅∠ADE.<br> Prove: ABCD is a parallelogram.
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!