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
Harman [31]
3 years ago
15

In a random sample of 25 ?people, the mean commute time to work was 30.4 minutes and the standard deviation was 7.1 minutes. ass

ume the population is normally distributed and use a? t-distribution to construct a 90?% confidence interval for the population mean ?. what is the margin of error of ??
Mathematics
1 answer:
seropon [69]3 years ago
7 0

In this problem, the given values are:

x = average = 30.4

s = standard deviation = 7.1

n = number of samples = 25

Degrees of freedom = n -1 =24

Using the t-distribution table for a normal curve at 90% CI, we get t-crit:

t-crit = 1.711

Now the Margin of Error (E) is calculated as:

E = t-crit*(s/ \sqrt{n})

By substituting the known values into the equation:

E = 1.711 * (7.1/ \sqrt{8})

E = +- 4.30

Therefore, the margin of error is 4.36. Hence, the commute time is between 26.1 minutes and 34.7 minutes.

<span> </span>

You might be interested in
Help please! i need both statements ASAP!
lys-0071 [83]

Answer:

For what are there pictures i caint see?

Step-by-step explanation:

3 0
3 years ago
Jolene bought a savings certificate that earned 2% in simple interest per year. She earned a total of $240 in interest over four
Travka [436]
The answer for your question is that it is 120
8 0
3 years ago
Read 2 more answers
What is the value of n - 5, when n = 8?<br> A) 3 <br> B) 4 <br> C) 12 <br> D) 13
evablogger [386]
You plug 8 into where n is so it's 8-5
8-5= 3 so the answer is A
8 0
3 years ago
Read 2 more answers
Write an equation of the line that passes through the point (1,3) and has a slope of -2
jek_recluse [69]

Answer:

y= -2x+1

Step-by-step explanation:

y=mx+b

y= -2x +b

3= -2(1) +b

3= -2 +b

b=1

y= -2x+1

4 0
3 years ago
An item is regularly priced at $97. Lucy bought it at a discount of 55% off the regular price.
Anastasy [175]
43.65 and saved 53.35
5 0
2 years ago
Other questions:
  • how many different ways can you use the digit 3 and 5 to write expressions in exponential form? What are expression?
    11·1 answer
  • Theories on dividing by "0". I think its infinity what about you?
    11·1 answer
  • Please help dood pls
    12·1 answer
  • What is 0.4% of 42? Show work
    10·2 answers
  • PLEASE HELP ME. Really need help
    5·1 answer
  • When a number is added to 1/5 of itself, the result is 24. The equation that models this problem is n + 1/5n = 24. What is the v
    6·1 answer
  • What is 4 divided by 520
    12·1 answer
  • If x²+1/4x²=8 ,find the value of x+1/2x​
    5·1 answer
  • Please help!!!! Due soon!! <br> I’ll mark you the brainliest answer! Please
    5·2 answers
  • Sum of the angles of a triangle is equal t.....? <br><br>​
    13·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!