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Delicious77 [7]
2 years ago
13

A field test for a new exam was given to randomly selected seniors. The exams were graded, and the sample mean and sample standa

rd deviation were calculated. Based on the results, the exams created claims that on the same exam,same exam, nine times out of ten, seniors will have an average score within 5% of 71%.
Is the confidence interval at 90%, 95% or 99%? What is the margin of error? Calculate the confidence interval and explain what it means in terms of the situation.
Mathematics
1 answer:
Lilit [14]2 years ago
3 0

Answer:

Step-by-step explanation:

sheeeeeesh

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Find the slope-intercept equation of the line,
netineya [11]

Answer:

slope is 2/4

Step-by-step explanation:

6 0
2 years ago
What is the quotient (3x^2 + 4x-15) divided by (x+3)
MrMuchimi

\frac{3x3 - 4x2 - 3x - 15}{x}
Step  1  :

simplify
\frac{15}{x}
Equation at the end of step  1  :

15 (((3 • (x2)) - 4x) - ——) - 3 x

Step  2  :

Equation at the end of step  2  :

15 ((3x2 - 4x) - ——) - 3 x

Step  3  :

Rewriting the whole as an Equivalent Fraction :

 3.1   Subtracting a fraction from a whole 

Rewrite the whole as a fraction using  x  as the denominator :

3x2 - 4x (3x2 - 4x) • x 3x2 - 4x = ———————— = —————————————— 1 x

Equivalent fraction : The fraction thus generated looks different but has the same value as the whole 

Common denominator : The equivalent fraction and the other fraction involved in the calculation share the same denominator

Step  4  :

Pulling out like terms :

 4.1     Pull out like factors :

   3x2 - 4x  =   x • (3x - 4) 

Adding fractions that have a common denominator :

 4.2       Adding up the two equivalent fractions 
Add the two equivalent fractions which now have a common denominator

Combine the numerators together, put the sum or difference over the common denominator then reduce to lowest terms if possible:

x • (3x-4) • x - (15) 3x3 - 4x2 - 15 ————————————————————— = —————————————— x x

Equation at the end of step  4  :

(3x3 - 4x2 - 15) ———————————————— - 3 x

Step  5  :

Rewriting the whole as an Equivalent Fraction :

 5.1   Subtracting a whole from a fraction 

Rewrite the whole as a fraction using  x  as the denominator :

3 3 • x 3 = — = ————— 1 x


4 0
3 years ago
Two components of a minicomputer have the following joint pdf for their useful lifetimes X and Y: f(x, y) = xe−x(1 + y) x ≥ 0 an
Yuri [45]

Answer:

For the given explanation we see that two life times are not independent

Step-by-step explanation:

probability for X (for x≥ 0)

\int\limits^\infty_0 {xe^-^x^(^1^+^y^)} \, dy

-e^-^x\int\limits^\infty_0 {de^-^x^y} \,

e⁻ˣ

Probability for X exceed 3

= \int\limits^\infty_3 {f(x)dx

= \int\limits^\infty_3 {e^-^3 dx

= e^-^3

probabilty for y≥ 0 is

\int\limits^\infty_0 {xe^-^x^(^1^+^y^)} \, dx \\

\int\limits^\infty_0{-x/1+yd(e^-^x^(^1^+^y^))} \, =1/(1+y)² \\

3 0
2 years ago
What is the percent of change from 800,000 to 600,000?
larisa86 [58]
I'm pretty sure it's 75%
4 0
3 years ago
Please help me before my math teacher calls me out again
FromTheMoon [43]
<h3>♫ - - - - - - - - - - - - - - - ~Hello There!~ - - - - - - - - - - - - - - - ♫</h3>

➷  Work out the original area:

(5 x 18) / 2 = 45cm^2

Increase/decrease the changed values:

18 x 0.7 = 12.6

5 x 1.2 = 6

New area:

(12.6 x 6) / 2 = 37.8cm^2

Calculate percentage change:

((45 - 37.8) / 45) x 100 = 16

16% decrease

<h3><u>✽</u></h3>

➶ Hope This Helps You!

➶ Good Luck (:

➶ Have A Great Day ^-^

↬ ʜᴀɴɴᴀʜ ♡

5 0
3 years ago
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