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
andrew11 [14]
3 years ago
5

Suppose the class sizes in high schools in a major public school district are normally distributed with an unknown population me

an and standard deviation. If a random sample of 28 high school classes is taken to estimate the mean class size, use a calculator to find the t-score that should be used to find a 90% confidence interval estimate for the population mean.
Mathematics
1 answer:
Blizzard [7]3 years ago
4 0

Answer:

1.703

Step-by-step explanation:

The reason we try to find t score is because the sample size is below 30, meaning the sample size is small

Hence:

Step 1

We find the degree of freedom

The Degrees of freedom = Number of samples - 1

The random number of samples = 28

= 28 - 1

= 27

Step 2

Using a t score table or t score calculator, we can obtain the t score value for a 90% confidence interval and degree of freedom of 27

90% confidence interval =

10% significance level = 0.10 for two tails or 0.1/2 = 0.05 for one tail

Hence: t90 = 1.703

You might be interested in
A mechanic charges $60 to inspect your heater, plus $70 per hour to work on it. You owe the mechanic a total of $410. Write and
uranmaximum [27]

Answer:

($410 - $60) / $70 = 5

After subtracting the $60 base fee, you can just divide the hours paid for by the hourly wage and find out how many hours were worked. Hope this helps!

5 0
3 years ago
A number is multiplied by 20, and that product is added to 5. The sum is equal to the product of 5 and 13.
liubo4ka [24]

Answer:

x = 3

Step-by-step explanation:

First, you will pick the first equation :

(x*20)

Then the next,

(x*20) + 5

Then the last equation,

(x*20) + 5 = 5*13

Then you solve

20x + 5 = 65

20x = 65 - 5

20x = 60

20x/20 = 60/20

x = 3

5 0
2 years ago
Write in point-slope form, slope-intercept form, and standard form an equation that passes through (-1,2) with slope 4.
N76 [4]

point slope form:y-2=4(x+1)

then distribute 4 and simplify y-2=4x+4 , y=4x+6 is the slope -y intercept form

then, move 4x on the left side, you get -4x+y=6 , multiply every term by -1, you get 4x-y=-6 which is standard form.

4 0
3 years ago
Mary has 40% fewer marbles than Jolie. If they combine all their marbles in a single bag, what percent of the marbles in the bag
dedylja [7]
The easiest way to do this would be to imagine that Jolie has 100 marbles. If Mary has 40% fewer, that means she has 60 marbles. Then if they combine all their marbles into a single bag, they will have 160 marbles, of which 100 are Jolie's. So the % that is Jolie's is 100/160 = 0.625 = 62.5%.
4 0
3 years ago
A triangle has side lengths 32 cm, 32 cm, and 50 cm.
Bogdan [553]

Answer:

Isosceles

Step-by-step explanation:

An isosceles has 2 equal sides, equilateral triangle has has all equal sides and the scalene has no equal sides

6 0
3 years ago
Read 2 more answers
Other questions:
  • Julia's great dane weighs 45 kgand Jake's chihuahua weighs 15 kg. How much bigger, as a percentage, is julia's dog?
    15·2 answers
  • Which explains whether or not the graph represents a direct variation?
    11·2 answers
  • Solve the system of equations.<br> y = 4x – 4<br> y = 5x
    13·1 answer
  • The city of Raleigh has 10500 registered voters. There are two candidates for city council in an upcoming election: Brown and Fe
    5·1 answer
  • What number is five more than the product of six and seven write an expression
    15·1 answer
  • A line passes through the point (-6,4) and has a slope of 5/2
    15·1 answer
  • Match the terms to their definition. 1. part-whole ratio a ratio comparing a portion of a whole quantity to the whole quantity 2
    6·1 answer
  • The unit rate of change of yyy with respect to xxx is the amount yyy changes for a change of one unit in xxx.
    7·1 answer
  • 3. Use proportional reasoning to answer the following question.
    9·1 answer
  • Mrs. kelley asked her students to plot the number of books they read over the summer. a dot blot titled books read over the summ
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!