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
Vinil7 [7]
3 years ago
9

A student group claims that first-year students at a university must study 2.5 hours (150 minutes) per night during the school w

eek. A skeptic suspects that they study less than that on the average. A class survey finds that the average study time claimed by 272 students is xbar= 141 minutes, with a sample standard deviation of 66.
Regard these students as a random sample of all first-year students and suppose we know that the study times follow a Normal distribution.

What is the standard error of the sample mean?

Consider the hypotheses H0: µ = 150 against Ha: µ < 150.

What is the value of the test statistic? Give your answer to two decimal places.

The p-value for the correct test statistic is 0.0126. What do you conclude at the a = 0.05 level?

We do not have enough evidence to say that students are not studying 2.5 hours per night during the school week.
We have strong evidence that, on average, students study less than 2.5 hours per night during the school week.
Mathematics
1 answer:
AlekseyPX3 years ago
7 0

Answer:

We have strong evidence that on average, students study less than 150 minutes per night during the school week

Step-by-step explanation:

Normal distribution:

mean     μ₀ = 150

Sample:

Sample size    n = 272

Sample mean   x = 141

Sample standard deviation  s  = 66

The standard error of the sample mean  SE = σ /√n

SE = 66/√272

SE = 66 / 16,49

SE = 4

Test Hypothesis:

Null hypothesis                            H₀             x  =   μ₀

Alternative hypothesis                Hₐ            x <    μ₀

z(s)  test statistics is:

z(s)  =  ( x  -  μ₀ ) / s/√n

z(s) = - 9 /4

z(s) =  -  2,25

p-value  for that z(s)      p-value  = 0,0122

Then for α =  0,05 p-value < 0,05

We are in the rejection region we need to reject H₀

You might be interested in
Find a set of parametric equations of the line with the given characteristics. (Enter your answer as a comma-separated list of e
emmainna [20.7K]

This question is incomplete, the complete question is;

Find a set of parametric equations of the line with the given characteristics. (Enter your answer as a comma-separated list of equations in terms of x, y, z, and t.) The line passes through the point (3, 1, 2) and is parallel to the line given by x  = y = z.

Answer:

the set of parametric equations of the line with the given characteristics are; x = t+3, y = t+1, z = t+2

Step-by-step explanation:

Given that;

line x = y = z and point ( 3, 1, 2 )

the given line can be written as;

[x-0 / 1] = [y-0 / 1] = [z-0 / 1]

if two lines are parallel directional ratios are equal.

so DIRECTIONAL RATIOS  of given line is ( 1, 1, 1 )

therefore required line is;

[x-3 / 1] = [y-1 / 1] = [z-2 / 1] = t

⇒ [x-3 / 1] = t

x = t+3

[y-1 / 1] = t

y = t+1

[z-2 / 1] = t

z = t+2

Therefore the set of parametric equations of the line with the given characteristics are; x = t+3, y = t+1, z = t+2

8 0
3 years ago
Write an equation in slope-intercept form of the line that passes through (-5, 19) and (5.13).
ruslelena [56]

Answer:

y=-3/5x+16

Step-by-step explanation:

m=(y2-y1)/(x2-x1)

m=(13-19)/(5-(-5))

m=-6/(5+5)

m=-6/10

simplify

m=-3/5

y-y1=m(x-x1)

y-19=-3/5(x-(-5))

y-19=-3/5(x+5)

y=-3/5x-15/5+19

y=-3/5x-3+19

y=-3/5x+16

3 0
2 years ago
Which models show the problem 4
exis [7]

Answer:

the second and last sentences.

Step-by-step explanation:

Its the most reasonable!

7 0
2 years ago
Read 2 more answers
Please help solve this
Drupady [299]

Answer:

0.125

Step-by-step explanation:

8 0
3 years ago
Read 2 more answers
Help please????????????
katen-ka-za [31]

Answer:

a. 32.5

Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
Other questions:
  • Why should you avoid investing all your money in familiar stocks
    12·1 answer
  • 9-4n in an arithmic sequence
    5·1 answer
  • The length of a rectangle is 3 times it's width. The difference between the length and width is 8 feet. Determine the rectangles
    13·1 answer
  • Which of the following square roots is best represented by Point A?<br> A<br> 3<br> 4
    9·1 answer
  • Possible answers:<br> A) 336cm <br> B) 110m<br> C) 588m<br> D) 1,029m
    10·2 answers
  • How many times does 9 go into 999999
    14·2 answers
  • SOMEONE PLEASE HELP ME ASAP PLEASEEEE!!!!​
    12·2 answers
  • Yana though of a number she multlipied it by 8 subtracted 4 divided the result by 2 what number did yana think of
    12·1 answer
  • Solve for y in terms of x.<br> 3x = 2y-18<br><br> Answers??
    12·2 answers
  • Question is in the picture
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!