How will decreasing the level of confidence without changing the sample size affect the width of a confidence interval for a population mean? Assume that the population standard deviation is unknown and the population distribution is approximately normal
Answer:
Without changing the sample size the change of CI may affect the results
Step-by-step explanation:
According to Central Limit theorem the sampling distribution is given by
Z= x`- u/ σ/√n
Z has in the limit a standard normal distribution and
x`= u ± zσ/√n
From the above
x`- z∝(σ/√n) ≤ u ≤ x`+ z∝(σ/√n)
This formula is used for the confidence interval with normal population and unknown standard deviation.
But if the different values of Z∝ are used the results will be different.
If the CI of 99% or 95% or 90% is used the values of acceptance and rejection regions change and therefore the results will change.
The value of Z∝ for
∝= 0.1 is ± 1.645
∝= 0.05 is ± 1.96
∝= 0.01 is ± 2.58
Suppose we get the calculated Z value equal 2.59 but we decrease the CI from 0.05 to 0.01 the acceptance region would become rejection region and the level of confidence will change.
A game has 9rows of playing cards .there are 8 cards in each row how many playing are there
Answer:
72 cards
Step-by-step explanation:
There are 8 playing cards in each row, with 9 rows in all.
To solve, simply multiply the two numbers together:
8 playing cards per row x 9 rows = 72 playing cards in all.
72 cards is your answer.
~
Answer:
73
Step-by-step explanation:
9 rows of cards with 8 each, so you would do- 9 x 8 = 72
-8(b + 11) - 4 = -3(5b - 6) - 4b
Answer: b=10
Step-by-step explanation: ((0 - 8 • (b + 11)) - 4) - (18 - 19b) = 0
Pull out like factors :
11b - 110 = 11 • (b - 10) 11 • (b - 10) = 0
b-10 = 0
Add 10 to both sides of the equation :
b = 10
given f (x)=-x-3,solve for x when f(x)=-2
Answer:
x=1
Step-by-step explanation:
[tex] - 2 = - x - 3[/tex]
using calculator you will get the x
I need help on estimation
please show me your working out I don't know what to do
will mark brainiest
Answer:
The estimate is 601.11984282
hope this helps :)
Answer:
310
Step-by-step explanation:
9.87 = 10 its 10 because 87 is over 50 so its closer to 10
0.509 = 1 50 is close to 100 which is 1
31 times 10 = 310
310 divide by 1
equals 310
please help i will give brainliest
Answer:
the opposite of 8
Step-by-step explanation:
the approximate mass of Mars is 6.42x10^23 kilograms. write this mass in standard notation
Answer:
642000000000000000000000 kg
Step-by-step explanation:
The approximate mass of Mars is 6.42x10^23 kilograms. It is given in scientic notation.
We need to write the mass in standard notation. It is the normal way of writing any number. To write it in standard form, we move the decimal to the right side.
The standard form will be :
6.42x10^23 kg = 642000000000000000000000 kg
Hence, this is the required solution.
what is 78 divided by 37 for my little brother.
Answer:
2.1
Step-by-step explanation:
78/37=2.10810811
Answer:
2,10
Step-by-step explanation
2,1081081081081081081081081081081
please help
Solve this system of equations.
2x + y = -6,
4x - 3y = -12
What is the solution to the system of equations?
Answer: x=-3
y=0
Step-by-step explanation:
PLS I DONT HAVE MUCH TIMEEE!!
the quotient is 307and the remainder is 2
identify the term of the expression 6x + 3
Answer:
x is the term
Step-by-step explanation:
a boat leaves at noon and has a bearing of S 35 east. The boat travels at 40 miles per hour. (a) many miles south and how many miles east will the boat have traveled at 7 pm
Answer:
South =34.18 miles
East= 49.12miles
Step-by-step explanation:
We begin by calculating the distance covered in 7n hours
that is from 12 pm to 7pm which is 7 hours
so time t= 7 hours
speed= 40 miles per hours
we know that speed= distance/time
let the distance be x
40=x/7
x=40*7
x=28miles
(a) many miles south and how many miles east will the boat have traveled at 7 pm
applying SOH CAH TAO we have
For the south CAH
cos Ф=hyp/adj
hyp= 28 mile
Ф= 35°
cos 35= 28/adj
0.819=28/adj
adj=28/0.819
adj=34.18 miles
For the East SOH
sin Ф=hyp/opp
hyp= 28 mile
Ф= 35°
sin 35= 28/opp
0.57=28/opp
opp=28/0.57
opp=49.12miles
If the day before yesterday, was tomorrows tomorrow's yesterday's tomorrow, then what would tomorrow's yesterday's tomorrow be?
Answer:
today
Step-by-step explanation:
ez " what would tomorrow's yesterday's tomorrow be?" this is telling us that we are thinking about yesterday
if we were to add a day to yesterday lets say its the first it would be the second lets say we were the 3rd and we add one day to yesterday we would call it today
Adrianna uses her credit card to purchase everything! She makes payments on the 15th of each month. Each payment she makes is for the same amount, and it is automatically deducted from her savings account. At the end of the year, Adrianna’s account balance changed by - $4,203.00 due to the payments she made. What is the change in Adrianna’s account balance each month due to the payments she makes on her credit card?
Answer:
$350.25 per month
Step-by-step explanation:
We can assume she pays the same amount every month. We know that there are 12 months in a single year, so we can divide to find the unit rate.
4203 / 12 = 350.25
Best of Luck!
Answer:
$350.25 per month
I hope this helps! good luck and hope you do well!
HELP PLEASE DONT HAVE MUCH TIME
Answer:
4.8*10^7
Step-by-step explanation: You chose the right answer. Hint plug it exactly like it is in the calculator and change your mode to scientific notation. That’s what I did
Alicia watched a drone take off from a bridge. The height of the drone (in meters above the ground) tttt minutes after takeoff is modeled by h(t)=−3t2+12t+96h(t)=-3t^2+12t+96h(t)=−3t2+12t+96h, left parenthesis, t, right parenthesis, equals, minus, 3, t, squared, plus, 12, t, plus, 96 Alicia wants to know when the drone will land on the ground. 1) Rewrite the function in a different form (factored or vertex) where the answer appears as a number in the equation. h(t)=h(t)=h(t)=h, left parenthesis, t, right parenthesis, equals 2) How many minutes after takeoff does the drone land on the ground?
Answer:
Step-by-step explanation:
Given the height of the drone modelled by the equation:
h(t)=-3t^2+12t+96
a) Rewriting this in a factored form.
From the equation, we can see that -3 is the greatest common factor. The equation therefore becomes:
h(t)= -3(t^2-4t-32)
Hence the function can also be written as h(t)= -3(t^2-4t-32)
b) The drone landed on the ground at when h(t) = 0. Substitute h(t) = 0 into the expression h(t)= -3(t^2-4t-32)
0 = -3(t^2-4t-32)
Divide through by -3
(t^2-4t-32) = 0
Factorize
t²+8t-4t-32 = 0
t(t+8)-4(t+8) = 0
(t-4)(t+8) = 0
t-4 = 0 and t+8 = 0
t = 4 and t = -8
Time can't be negative:
t = 4minutes
Hence it took the drone 4 minutes take off to land on the ground
Answer: 1) h(t)= -3 (t-8) (t+4)
2) 8 mins.
Step-by-step explanation: This is the correct answer. I tried.
George buys oranges and apples at a ratio of 3:4 for his party. If he has 15 oranges, how many apples does he have?
Answer: 20 apples
Step-by-step explanation:
If 15 oranges is represented as 3, this means it was divided by 3.
15 ÷ 3 = 5
Now, get the number 5 and multiply it by 4.
5 × 4 = 20
The answer is 20 apples. Hope this helps!
To find 50% of a number, divide the number by
To find 25% of a number, divide the number by
To find 10% of a number, divide the number by
First is ✨2
Second is✨4
Third is✨10
The Correct Answer Is Below Answering The Follwing Question.
-2-
-4-
-10-
Have A Blessed Day!
The answers are To find 50% of a number, divide the number by 2, To find 25% of a number, divide the number by 4 and To find 10% of a number, divide the number by 10.
What is percentage?A percentage is a number that tells us how much out of 100 and can also be written as a decimal or a fraction.
Given that, by what we should divide to the give expression to get 25%, 50% and 10%
Converting the percentage into fractions,
To change the percentage to a fraction, put the percentage number in the numerator and 100 in the denominator.
50% = 50/100 = 1/2, so we will divide it by 2,
25% = 25/100 = 1/4, so we will divide it by 4,
10% = 10/100 = 1/10, so we will divide it by 10.
Hence, The answers are To find 50% of a number, divide the number by 2, To find 25% of a number, divide the number by 4 and To find 10% of a number, divide the number by 10.
For more references on percentage, click;
https://brainly.com/question/29306119
#SPJ2
A clerk entering salary data into a company spreadsheet accidentally put an extra "0" in the highest
employee salary (the boss's salary!), listing it as $1,500,000 instead of $150,000. How does this
error affect the measures of center (median and mean)?
A. The median will be the same. The mean will be too small.
B. The median will be the same. The mean will be too large
C. The median will be too small and the mean will be too large,
D. The median and the mean will both be too large.
Answer:
The correct option is B.
Step-by-step explanation:
The median (m) is a measure of central tendency. To obtain the m, we assemble the data in arising order. If the data is odd, the m is the mid-value. If the data is even, the m is the arithmetic-mean of the two mid-values.
The mean is the average value of the data set. It is computed by dividing the sum of all the values in data set by the number of values.
So, the mean considers all the values in the data set. But the median considers only one value.
It is provided that the clerk entering salary data into a company spreadsheet accidentally put an extra "0" in the highest employee salary (the boss's salary!), listing it as $1,500,000 instead of $150,000.
The highest salary will be taken into account while the computation of mean. But it would not be considered while determining the median.
So, the median salary will remain same. But the mean salary will change.
And since the highest salary is increasing from $150,000 to $1,500,000 the mean will also increase.
Thus, the correct option is B.
Which of these numbers is a rational?
Answer:
f. II only
II. [tex]\sqrt{81}[/tex]=9
This is the only one that results in a rational number
3x+y = −6 what is the slope and y-intercept
Answer:
The value of m (slope) is -3
The value of b (y-intercept) is -6
Step-by-step explanation:
First you need to isolate y:
3x + y = −6
y = -3x - 6
The value of m (slope) is -3
The value of b (y-intercept) is -6
A football team loses 5 yards on each of 4 consecutive plays. Find the total change in yards from where the team started.
Answer:
-20 yards
Step-by-step explanation:
-5 x 4 = -20 yards
check screenshot for question
Simplify -9 + m + (-6)
Answer:
m-15
Step-by-step explanation:
The perimeter of an equilateral triangle is 7 inches more than the perimeter of a square, and the side of the triangle is 5 inches longer than the side of the square. Find the side of the triangle.
Answer:
13 inches
Step-by-step explanation:
What is the value of the expression (-2)5?
A. 32
B. 10
C. -10
D. -32
Answer:
C
Step-by-step explanation:
A negative multiplied by a positive is a negative.
Answer:
C. -10
Step-by-step explanation:
because 2 times 5 is 10 but if you have a negative 2 it will be negative 10
Heyy i need help!
-5 1/4 - (-7 1/2)
Answer:
9/4
Step-by-step explanation:
-5 1/4 - (-7 1/2)
-21/4 - (-15/2)
-21/4 + 15/2
-21/4 + 30/4
9/4
NEED HELP ASAP!!! WILL MARK BRAINLIEST!!!!!!
** And please look at the picture and answer the answer choices ONLY**
Tyler has two cube-shaped storage spaces in apartment building, one large and one small.
Answer:
[tex]s^{3}+12[/tex]
Step-by-step explanation:
what is the slope of (-2,-1) and (2,-3)
Answer:
The slope is -1/2
Step-by-step explanation:
Im stuckplz help Brainliest Write three equivalent ratios for each ratio. a) 5 to 6 b) 28:42 c) 3 4 :6 5
plz show work
Answer:
a) 15:18, 10:12, 20:24
b) 56:84, 14:21, 2:3
c) 68:130, 136:260, 170:325
Step-by-step explanation:
a) multiply 5 and 6 by 3
multiply 5 and 6 by 2
multiply 5 and 6 by 4
b) multiply 28 and 42 by 2
divide 28 and 42 by 2
divide 28 and 42 by 14
c) multiply 34 and 65 by 2
multiply 34 and 65 by 4
multiply 34 and 65 by 5
