An industrial/organizational psychologist is consulting with Family Practice Pediatrics, which has just lost several of its best doctors to a rival pediatric practice. The management at Family Practice would like to know what it can do to increase job satisfaction for its remaining pediatricians. The psychologist is trying to determine whether significant information will be lost if she surveys a subset rather than every single pediatrician at Family Practice.
The following table lists the job satisfaction scores for all eight pediatricians at Family Practice as well as four examples of possible four-pediatrician samples. At the bottom of the table, the variance listed in the second column for all eight pediatricians is the population variance for the eight pediatricians (that is, sigma^2 = SS/N = SS/8). The variances listed in the third through the sixth columns are the sample variances for each of the four-pediatrician samples (that is, s^2 = SS/(n - 1) = SS/3).
Pediatrician Satisfaction Sample 1 Sample 2 Sample 3 Sample 4
A 5 x x x
B 6 x x x x
C 8 x x x
D 3 x
E 7 x x
F 2 x
G 8 x x
H 9
Mean 6.00 6.75 6.50 5.25 6.00
Variance 5.50 2.25 1.67 6.25 4.67
What is the mean of the four sample means?
What is the mean of the four sample variances?
A sample statistic is_______ if the average value of the sample statistic, obtained over all possible samples, is equal to the population parameter.
A sample statistic is_______ if it consistently underestimates or overestimates the corresponding population parameter.
A sample mean (that is, M = sigma X/n) is_________ estimator of the population mean. A sample variance that is computed as s^2 = SS/(n - 1) is estimator of the population variance.
Answers
Complete Question
The complete question is shown on the first uploaded image
Answer:
What is the mean of the four sample means is [tex]\= x = 6.125 [/tex]
What is the mean of the four sample variances is [tex]\= x_v = 3.71[/tex]
A sample statistic is an unbiased point estimator if the average value of the sample statistic, obtained over all possible samples, is equal to the population parameter.
A sample statistic is biased if it consistently underestimates or overestimates the corresponding population parameter.
A sample mean (that is, M = sigma X/n) is unbiased estimator of the population mean
A sample variance that is computed as s^2 = SS/(n - 1) is unbiased estimator of the population variance.
Step-by-step explanation:
From the question we are told that
Mean 6.00 6.75 6.50 5.25 6.00
Variance 5.50 2.25 1.67 6.25 4.67
Generally the mean of the four sample means is mathematically represented as
[tex]\= x = \frac{6.00+ 6.75 + 6.50 + 5.25 + 6.00}{4}[/tex]
=> [tex]\= x = 6.125 [/tex]
Generally the mean of the four sample variances is mathematically represented as
[tex]\= x_v = \frac{5.50+ 2.25+ 1.67+ 6.25 +4.67}{4}[/tex]
=> [tex]\= x_v = 3.71[/tex]
Related Questions
1/12
Multiply
(3v – 8)(v +6)
A) 312 – 26V + 48
C) 3v2 + 101 - 48
B) 30v2 - 41 - 48
D) 312 - 48
Answers
Answer:
C
Step-by-step explanation:
Its one only one with 3v2 since you do 3v * v
Easy math problem help me.I will give brainliest
Answers
Answer:
25
Step-by-step explanation:
I need the answer plzz I need help
Answers
God bless everyone vankka is correct!
Answer:
1) False
2) False
3) True
4) True
Step-by-step explanation: Looked at graph.
Hope this helps!
what is 2+2x2
ill give brainliest to the person that gets it correct
Answers
Answer:6
Step-by-step explanation:
Answer:
6.............................
Step-by-step explanation:
What is the quotient (6 x 10^8) ÷ (1.5 x 10-^4)
Answers
Answer:
4x10^4 or 40000
Step-by-step explanation:
Answer:
4x10^4 or 40000
Step-by-step explanation:
help me pleeeaaasssee
Answers
Answer:
[tex]a=2\frac{A}{P}[/tex]
Step-by-step explanation:
[tex]A=\frac{1}{2} ap[/tex]
because you want a, divide both sides by p
[tex]\frac{A}{p} =\frac{1}{2} a[/tex]
then, because the reciprocal of 1/2 is 2, multiply both sides by 2
[tex]a=2\frac{A}{P}[/tex]
Question 1 of 2
15 Points
A report revealed that the average no. of months that an employee stays in a factory is 36
months. Assuming that the no. of months of an employee tenure in the factory is normally
distributed with a standard deviation of 6 months, find the probability that a certain employee
will stay
a. More than 30 months
b. Less than 24 months
c. Between 24 to 48 months
Answers
Answer:
Step-by-step explanation:
Given the following :
Mean(m) = 36 months
Standard deviation (s) = 6 months
A) probability of staying more than 30 months :
Zscore = ( x - m) / s
x = 30
Zscore = (30 - 36) / 6
Zscore = - 6/6
= - 1
P(Z > - 1) = 1 - p(Z < - 1) ; p(Z < - 1) = 0.1587
1 - p(Z < - 1) = 1 - 0.1587 = 0.8413
2)less than 24 months :
Zscore = ( x - m) / s
x = 24
Zscore = (24 - 36) / 6
Zscore = - 12/6
= - 2
P(Z < - 2) = 0.0228
3.) between 24 to 48 months
For 24 months : from above = 0.0228
48 months :
Zscore = ( x - m) / s
x = 48
Zscore = (48 - 36) / 6
Zscore = 12/6
= 2
P(Z < 2) = 0.9772 ( from z table)
Hence,
0.9772 - 0.0228 = 0.9544
HELP!!!
Find the equation of a line parallel to 2x + 2y=6 that contains the point (3,-5), Write the equation in slope-intercept
Answers
Answer:
[tex]y = -x -2[/tex]
Step-by-step explanation:
Slope-Intercept form of the line
Any given line with slope m and y-intercept b can be written as:
y=mx+b
We need to find the equation of a line parallel to
2x + 2y = 6
Dividing by 2:
x + y = 3
Solving for y:
y = -x + 3
Comparing with the slope-intercept form of the line:
m = -1
Parallel lines have the same slope, thus the required line must have a slope m = -1.
Since we have a point through which the line passes, we use the point-slope form:
y - k = m ( x - h )
Where (h,k) is the point.
The required equation of the line is:
y - (-5) = -1 (x - 3)
Operating:
y + 5 = -x + 3
Solving for y:
[tex]\boxed{y = -x -2}[/tex]
Find an equation of the vertical line through (-4,3)
Answers
Answer:
x=-4
Step-by-step explanation:
Vertical lines are of the form
x =
The x coordinate is -4
x=-4
A scientist is weighing each of 30 fish. She obtains a mean of 30 g and a standard deviation of 2 g. After completing the weighing, she finds that the scale was misaligned and always under reported every weight by 2 g that is, a fish that really weighed 26 g was reported to weigh 24 g. What is the mean and standard deviation after correcting for the error in the scale
Answers
Answer:
Correct mean = 32 grams
Correct Standard deviation = observed S.D = 2 grams
Step-by-step explanation:
We are told in the question above :
A scientist is weighing each of 30 fish. She obtains a mean of 30 g and a standard deviation of 2 g. After completing the weighing, she finds that the scale was misaligned and always under reported every weight by 2 g that is
The mean after correcting the error in the scale is :
= observed mean + 2g
= 30g + 2g = 32g
The standard deviation after correcting the error in the scale remains the same as the difference of 2g has no significant effect on the Standard deviation.
This standard deviation = 2g
The horse ran the first mile in 132.78 seconds and the second mile in 157.103 seconds. What is the estimated difference in the times?
Answers
Answer:
I have no clue sorry
Step-by-step explanation:
sorrytroublechevkers
Answer:
the difference is 24.323 seconds, if you round the numbers and then subtract the difference is 24 seconds
whoever answers first gets brainliest if i can im desperate??
Answers
Answer:
33/209
Step-by-step explanation:
11*19=209 . 3(11)=33 . 33/209
Given parameters:
Length of the rectangle = [tex]\frac{11}{19}[/tex] mile
Width of the rectangle = [tex]\frac{3}{11}[/tex] mile
Unknown:
Area of the rectangle = ?
Solution:
The area of a rectangle is
Area of rectangle = length x width
= [tex]\frac{11}{19}[/tex] x [tex]\frac{3}{11}[/tex]
= [tex]\frac{3}{19}[/tex]mile²
50 people were asked if they had ever been to Mauritius or the Seychelles on holiday.
11 had been to Mauritius, 7 had been to the Seychelles and 35 had been to neither.
How many had been to both?
Answers
Answer:
11 + 7 = 18. Meaning to both Islands 15 people have visited so far.Determine if both triangles are congruent or not. Label the triangles as SSS, AAS, ASA, SAS, HL, or not enough information.
Answers
△ABD and △BCD are congruent as:
∠CBD = ∠ABD (Equal Angles)
BD = BD (Common side)
The 90 degree angle (Common between both triangles)
Therefore
△ABD ≅ △BCD (By AAS)
The diagram is not drawn to scale and it appears misleading since AD appears shorter than DC. However, the smaller triangles are congruent and we can prove it using ASA.
The tickmarks on the angles show we have a pair of congruent angles. The other pair of congruent angles are the two right angles (angle BDC and angle ADB). The pair of congruent sides are DB = DB. We use the reflexive property here. The sides are between the congruent angles mentioned. So we'll use ASA and not AAS.
-------------
Extra info:
We can't use SSS because we only have info about one pair of sides. SAS won't be used either for the same reason. HL = hypotenuse leg, and it applies to right triangles only. We don't have any info about the hypotenuse of either triangle, so we can't use this either.Help.please i will mark brainliest !!
Answers
Answer:
SAS
Step-by-step explanation:
SAS is the correct answer
Please help ASAP ! Find the expressions for the perimeter of these shapes.
Answers
Answer:
Quest 1. P = 3xat2 + 4yat2 + 11xy
Quest 2. P = 7xat2 + 21x + 5y + 5
Step-by-step explanation:
Note: Perimeter, P is the total sum of the distance round about an object. that at symbol cant be used here.so.am.using at2 for squared
drag and drop each expression to correctly classify if it as having a positive or negative product just put them in order from positive to negative. WHOEVER GIVES ME THE RIGHT ANSWER I WILL MAKE BRAINLIEST
Answers
Answer:
The two in the middle are the negatives and the two that are on the sides are positive.
which number makes the number sentence true? (6+9)+4=4+?
Answers
Answer
(6+9)+4=4+15
Step-by-step explanation:
First you would do (6+9) because it's in parenthesis. (6+9)= 15. So now our equation looks like 15+4=4+? Next we will do 15+4=19. 19=4+? is the new equation. Now the final step is to do 19-4=15 which is what we will plug into the equation.
Which is the completely factored form of 18x4 – 42x3 + 24x2?
3x(3x - 4)(2x - 2)
3x2(3x - 4)(2x - 2)
6x(3x – 4)(x - 1)
6x²(3x - 4)(x - 1)
Answers
Answer:
D
Step-by-step explanation:
The completely factored form is 6x² (3x - 4) (x - 1).
Option D is the correct answer.
What is an expression?An expression is a way of writing a statement with more than two variables or numbers with operations such as addition, subtraction, multiplication, and division.
Example: 2 + 3x + 4y = 7 is an expression.
We have,
18[tex]x^4[/tex]– 42x³ + 24x²
Now,
The common factor of 18, 42, and 24 is 6.
And x² is common to all the terms.
So,
6x² (3x²– 7x + 4) _____(1)
Now,
(3x²– 7x + 4)
3x² - (4 + 3)x + 4
3x² - 4x - 3x + 4
x(3x - 4) - 1(3x - 4)
(3x - 4) (x - 1) ______(2)
Now,
From (1) and (2) we get,
6x² (3x - 4) (x - 1)
Thus,
6x² (3x - 4) (x - 1) is the completely factored form.
Learn more about expressions here:
https://brainly.com/question/3118662
#SPJ6
Select the correct answer. The steps for solving the given equation are shown below. 8-3x=20 Select the correct equation for the missing step in the table.
Answers
Answer:
C
Step-by-step explanation:
Multiplying by the reciprocal is the same as division.
Answer:
its actually (b) addition property of equality
Step-by-step explanation:
i got the answer correct on edmentum
Can the union of two sets have a solution of a null set? Why or why not?
Answers
Answer:
Yes, the union of two sets have a solution of a null set.
Step-by-step explanation:
The school store sells 4 pencils for $0.80. What is the unit cost of a pencil?
Answers
Is 3/4 a repeating decimal
Answers
Answer:
No.
Step-by-step explanation:
3/4 = 0.75
Answer: non-repeating
Step-by-step explanation:
Which statement is false
A. Every integer is also a rational number
B. No rational number is irrational
C. Every rational number is also an integer
D. Every irrational number is also real
Answers
Answer:
C
Step-by-step explanation:
The answer is C because a rational number is a number that doesn't go forever, and an integer is a positive or negative whole number. For example, 3.5 is rational but not an integer. So, the correct answer is C, and I hope it helps!
The sum of two consecutive integers is
−23.
Find the numbers.
Answers
Answer:
-11 and -12
Step-by-step explanation:
first integer: x
second integer: x + 1
x + x + 1 = -23
2x + 1 = -23
2x = -24
x = -12
first integer: -12
second integer: -12 + 1 = -11
Lanie works part-time at Sweet Treats Catering. She earns $13.25 per hour and work 25 hours a
week. She is paid semi-monthly.
a. Calculate her gross pay for 1 paycheck. Show all your math calculations.
Answers
Answer:
Semi-monthly gross pay = $662.5
Step-by-step explanation:
Given:
Earning per hour = $13.25
Number of hours per week = 25 hours
Find:
Semi-monthly gross pay
Computation:
Assume two week in semi-month
So,
Total working hour = 2(25)
Total working hour = 50 hours
Semi-monthly gross pay = Total working hour × Earning per hour
Semi-monthly gross pay = 50 × 13.25
Semi-monthly gross pay = $662.5
I need help on it pls
Answers
Answer:
The answer is 15,008 you clicked the right one.
Step-by-step explanation:
Answer: your answer is right
Step-by-step explanation: i did the computation
Which is greater?
(-3)(3) - 7 ______ 15 ÷ (-5) + 4
<,>,=
Answers
Answer:
15 and the rest it's a big
Which of the following is an equation that involves a variable under a radical sign?
Quadratic Equation
Radical Eqaution
Exponential Equation
Linear Equation
Answers
the volume of a cube is 125 in cúbicas. How long is each side?