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
nataly862011 [7]
2 years ago
15

A supervisor records the repair cost for 23 randomly selected stereos. A sample mean of $91.82 and standard deviation of $16.84

are subsequently computed. Determine the 98% confidence interval for the mean repair cost for the stereos. Assume the population is approximately normal.
Find the critical value that should be used in constructing the confidence interval. Round your answer to three decimal places.
Mathematics
1 answer:
Assoli18 [71]2 years ago
6 0

Answer: 2.508

Step-by-step explanation:

As per give , we have

Sample size : n= 23

Degree of freedom : df= n-1=22

significance level : \alpha: 1-0.98=0.02

Since , the sample size is small (n<30) and population standard deviation is unknown.

So , we use t-test.

For confidence interval , we find two-tailed test value.

Critical t-value : t_{\alpha/2, df}=t_{0.01,22}

=2.508  [using students's t-critical value table]

Hence, the critical value that should be used in constructing the confidence interval = 2.508

You might be interested in
What is the factored form of the expression?Factor completely. 6x^4-9x^3-36x^2+54x
mario62 [17]
If we factorize the expression

6x^4-9x^3-36x^2+54x

We will get

3x(2x-3)(x^2-6)


Hope I helped!
8 0
3 years ago
Read 2 more answers
A marching band was in a parade. the band members marched in 8 rows. there were 6 band members in each row. explain how the fact
natta225 [31]
If 5 x 6 = 30 you can figure out 8 x 6 by adding 6 three times to 30!

30 + 6 = 36

36 + 6 = 42

42 + 6 = 48 <-- the answer is 48!
6 0
3 years ago
For the given points a(-4 6) and b(6 -4) find the slope of a line through points A and B
kap26 [50]

Answer:

the required slope of the points is -1...

3 0
3 years ago
Please help fast <br>need it by today
KiRa [710]
6. It is asking you to find the surface area for this one:

1 litre = 0.001 cubic meters
15.4 litres = 0.0154 cubic meters

The volume of the cylinder has to be 0.0154m^3.

V = (pi(r)^2)h
0.0154 = (pi(r)^2)(1)
r^2 = 0.0154/pi
r = 0.07m

Surface Area of Circles on Bottom:
A = pi(r)^2
A = pi(0.07)^2
A = 0.0154
0.0154*2 = 0.0308m^2

Surface Area of Walls:
This will be the circumference of the circle times the height, since the walls are just like a big rectangle.

C = 2pi(r)
C = 2pi(0.07)
C = 0.44m
0.44*1 = 0.44m^2

Finally, add the two surface areas:
0.44 + 0.0308 = 0.47m^2

You will need 0.47m^2 of sheet metal to make this cylinder.

7. Find the volume of everything and just the graphite, and subtract the graphite’s volume from everything to get just the wood. The volume of a cylinder is pi((r)^2)h.

Everything:
Watch out for units, since the diameter is in mm and the length is in cm.

r = 3.5mm or 0.35cm
V = pi((0.35)^2)(14)
V = 5.34cm^3

Graphite:

r = 0.5mm or 0.05cm
V = pi((0.05)^2)(14)
V = 0.11cm^3

5.34 - 0.11 = 5.23cm^3

8. For this problem, it wants your answer in cm^3. Find the volume of one bowl and multiply it by 250:

r = 3.5cm
V = pi((3.5)^2)(4)
V = 153.94cm^3

153.94*250 = 38484.51cm^3 of soup needed.

I sure hope that I didn’t confuse you too much with all of my math gibberish (sorry). Please let me know if there is anything else that I can help with. Have a nice day
3 0
2 years ago
For the right triangle with side of lengths 5 12 and 13, find the length of the radius of the inscribed circle
I am Lyosha [343]
Hi,
r*(5+12+13)=5*12\\\\&#10;&#10;r= \dfrac{60}{30} \\&#10;&#10;\boxed{r=2}
3 0
3 years ago
Other questions:
  • Use partial fractions to find the indefinite integral. (Remember to use absolute values where appropriate. Use C for the constan
    11·1 answer
  • Which shows the expression below simplified?
    10·2 answers
  • Any 3 digit describe how to find the number that is 10 more
    6·2 answers
  • the amount of sales at a toy store increases by 30% from May to June and decreases by 10% from June to July. The difference in t
    13·1 answer
  • What is the 98+56-52%=
    10·1 answer
  • Which is the prime factorization of 24?
    12·1 answer
  • Can anyone help me with this?<br> Thank you
    15·2 answers
  • Can someone help me plz!!
    5·1 answer
  • A cake shop offers circular cakes with diameters of 8 in., 12 in., and 15 in. Identify the area of each cake
    15·1 answer
  • Mr. Gray’s quiz was normally distributed with a mean of 25 and a standard deviation of 10 find z- scores for each of the followi
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!