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
Nataly [62]
3 years ago
5

Babcock and Marks (2010) reviewed survey data from 2003–2005 and obtained an average of μ = 14 hours per week spent studying by

full-time students at four-year colleges in the United States. To determine whether this average has changed in the past 10 years, a researcher selected a sample of n = 64 of today’s college students and obtained an average of M = 12.5 hours. If the standard deviation for the distribution is σ = 4.8 hours per week, does this sample indicate a significant change in the number of hours spent studying?
Mathematics
1 answer:
Dmitry [639]3 years ago
6 0

Answer:

We do not have enough evidence to accept H₀

Step-by-step explanation:

Normal Distribution

size sample  =  n = 64   (very small sample for evaluating population of 5  years

Standard deviation 4,8

1.- Test hypothesis

H₀             null hypothesis        ⇒               μ₀ = 14       and

Hₐ     alternative hypothesis   ⇒                μ₀ ≠ 14

2.- z(c)  we assume α = 0,05  as we are dealing with a two test tail we should  consider   α/2  = 0.025.

From z table we the z(c) value

z(c) = 1.96           and of course by symmetry   z(c) = -1.96

3.- We proceed to compute z(s)

z(s)  = [ (  μ -  μ₀ ) /( σ/√n) ]           ⇒    z(s)  = - (1.5)*√64/4.8

z(s)  = - 2.5

We compare z(s)  and z(c)

z(s) < z(c)     -2.5  < -1.96  meaning  z(s) is in the rejection zone

we reject H₀ .

From the start we indicate sample size as to small for the experiment nonetheless we found that we dont have enough evidence to accept H₀

You might be interested in
8u^2- 42u^2<br> Help plzz
zysi [14]

Answer:

- 34u^2

Step-by-step explanation:

8u^2 - 42u^2

= ( 8 - 42 )u^2

= - 34u^2

7 0
3 years ago
Read 2 more answers
The cubic polynomial below has a double root at r4 and one root at x = 6 and passes Through the point (2, 36) as shown. Algebrai
qaws [65]

The graph in the question is missing.

Answer:

y  = \frac{-1}{4}( x^3 + 2x^2 - 32x -96)

Step-by-step explanation:

The function is cubic

It has roots as -4, -4 , 6

this means the value of x = -4, -4 , 6 which makes the entire equation zero

so we have solutions as

x+4 = 0

x+4 = 0

x- 6 = 0

on forming a cubic equation using these

(x+4)(x+4)(x-6)

the equation passes through (2,36)

put x = 2

(2+4)(2+4)(2-6) = (6)*(6)*(-4)

which exceeds 36 so we product the equation with -1/4 to get 36

Final equation

y = \frac{-1}{4} (x+4)(x+4)(x-6)

  y  = \frac{-1}{4}( x^3 + 2x^2 - 32x -96)

3 0
2 years ago
Really need help on this asap!!!!!
marusya05 [52]

Answer:

srry

Step-by-step explanation:

6 0
3 years ago
Renting video games from Store A costs $3.50 per game plus a monthly fee of $7.50. Renting video games from Store B costs $5.00
Burka [1]

Answer:

A

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
In triangle PQR point c is the centroid if PQ= 30 then PX=
vova2212 [387]

Answer:

15

Step-by-step explanation:

since c is the centroid, therefore PX=XQ=1/2 x PQ

∴ PX=15

3 0
3 years ago
Other questions:
  • salt water has a density of 1030 kg/m^3. a piece of wood with mass of 1260 g is a cuboid with dimensions 7 cm x 10 cm x 15 cm.Wi
    12·1 answer
  • My brain hurts trying to solve this. Im pretty sure x = 42 but im not sure about the equation.
    14·2 answers
  • Solve the equation...<br><br> х = Зу-7<br> 3х +4y = 18<br><br> X=<br> Y=
    15·2 answers
  • Are the two right triangles similar?
    9·1 answer
  • -(7y+9)-(-6y+2)=-5 what is the aswer to this oroblem
    14·1 answer
  • A cookie recipe calls for 1/4 cup of brown sugar for one batch of 24.How many cups
    9·1 answer
  • If f(x) = x^2 - 25 and g(x) = x - 5, what is the domain of (f/g)(x)
    12·1 answer
  • ⚠️Warning answer fast⚠️
    10·1 answer
  • What is wrong in the drawing? How can you make this work<br> Correct?
    15·1 answer
  • Help asap!!!!!!!!!!!
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!