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
alexira [117]
3 years ago
10

Five hundred randomly selected working adults living in Calgary, Canada were asked how long, in minutes, their typical daily com

mute was (Calgary Herald Traffic Study, Ipsos, September 17, 2005). The resulting sample mean and standard deviation of commute time were 28.5 minutes and 24.2 minutes, respectively. Construct and interpret a 90% confidence interval for the mean commute time of working adult Calgary residents.
Mathematics
1 answer:
Anarel [89]3 years ago
5 0

Answer:

90% confidence interval for the mean commute time of working adult Calgary residents is between a lower limit of 26.72 minutes and an upper limit of 30.28 minutes.

Step-by-step explanation:

Confidence Interval = Mean + or - Error margin (E)

mean = 28.5 minutes

sd = 24.2 minutes

n = 500

degree of freedom = n - 1 = 500 - 1 = 499

confidence level = 90%

t-value corresponding to 499 degrees of freedom and 90% confidence level = 1.64801

E = t × sd/√n = 1.64801 × 24.2/√500 = 1.78

Lower limit = mean - E = 28.5 - 1.78 = 26.72 minutes

Upper limit = mean + E = 28.5 + 1.78 = 30.28 minutes

90% confidence interval is between 26.72 and 30.28 minutes.

You might be interested in
Witch of these has a slope of -3/4 and a y intercept of 3/2
Arada [10]

Answer:

See explanation. (Also you can write an equation several different ways so without the choices I cannot tell you which)

Step-by-step explanation:

Slope-intercept form is y=mx+b

So one way to write the equation is y=-3/4 x +3/2

There are more ways to write it.

Every line about to write is a way to write it.

Multiply both sides by 4:                 4y=-3x+6

Add 3x on both sides:               3x+4y=6

Subtract 6 on both sides:         3x+4y-6=0

There are a lot of ways to write an equation like this.

To better assist you I would need to see options.

5 0
3 years ago
What is the absolute value of 1/2?
harina [27]

The Absolute Value of a number is "the magnitude of a real number without regard to its sign". So the Absoulute Value of 1/2 is |1/2|

7 0
3 years ago
What are the measures of anglss a, b, and c? Show your work and explain your answers.
alexgriva [62]

A is 40

B is 50

C is 115

Explanation, A is the same as the opposite, A + B + 90 = 180, and C + 65 = 180

4 0
3 years ago
Help me please Find the measure of angle QST
Oksi-84 [34.3K]

Answer:

Angle QST=52°+47°

=99°

3 0
2 years ago
Plane H is shown.<br> Which points are coplanar and noncollinear?
Natalka [10]

Answer:

Points A, C, and D are coplanar, and Point B is noncollinear.

Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
Other questions:
  • An open-top box is formed by cutting squares out of an 11 inch by 17 inch piece of
    11·1 answer
  • Find the amount of the discount on a $140 bicycle that is on sale for 30% off A.$98.00 B.$32.00 C.$42.00 D.$4.20
    12·2 answers
  • Mr johnson sells erasers for 3 dollars each he sold 96 last week and sold 204 erasers this week about how much morr mone did he
    12·1 answer
  • What is point A (-9, -18) rotated 90° counterclockwise?
    8·1 answer
  • Compute the perimeter of the rectangle using the distance formula. (round to the nearest integer)
    12·1 answer
  • In ΔEFG, the measure of ∠G=90°, EF = 95 feet, and FG = 26 feet. Find the measure of ∠F to the nearest degree.
    5·2 answers
  • Pete glues a rope around his rectangular rodeo sign. His sign has side length of 2 feet and 3 feet.The rope cost $4 for each foo
    5·1 answer
  • What is the importance of polynomial functions and how this real life applications improve or contribute to the value of life
    8·1 answer
  • What is the value of the expression below when z=4?<br> 10z-3
    14·2 answers
  • University Data
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!