MATHEMATICS HIGH SCHOOL

A sample of 56 randomly selected cellphones of a new model were checked for a particular defect. Of these, 38 of the cellphones were found to be defective. Find a 80% confidence interval for p. Use the Agresti-Coull method.

Answers

Answer 1

Answer:

Answer:

Confidence Interval: (0.60, 0.76)

Step-by-step explanation:

The provided information is:

Sample Size (n) = 56

Consider X be the number of defective cellphones. Then X = 38

Proportion of defective cellphones is: $p=(38)/(56)=0.68$

At 80% confidence interval, value of z is 1.28

Thus, the 80% confidence interval for proportion is given as:

$p\pm z\sqrt{(p(1-p))/(n)}}\n=0.68\pm1.28\sqrt{(0.68*0.32)/(56)}\n=(0.60,0.76)$

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Janine wishes to conduct a poll to predict how many students will vote for her for class president. Which polling methods are likely to be biased? Choose all answers that are correct. A. Five people in each of Janine’s classes are selected and asked for whom they intend to vote. B. From a list of all students in Janine’s grade, 25 students are selected at random and asked for whom they intend to vote. C. Every 10th student from a list of all students in Janine’s grade is selected and asked for whom the student intends to vote. D. Janine chooses 5 of her friends and asks each to select another 5 students. These 25 students are asked for whom they intend to vote.

Answers

D since she is asking her friends who are just going to ask their friends
A. since only 5 are asked

1. AQRS ~ ATUV; find x
54
S
R
U
36
의
24.
x+5
T

Answers

Step-by-step explanation:

x+5=36

or, x=36-5

or, x=31

The value of x=31

Anyone know this?????

Answers

Answer:

WZX=57

Step-by-step explanation:

90-33 = 57

You don't have to use the equation unless you want to check yourself.

The answer to 11 pleasee?

Answers

Answer:

d 34

Step-by-step explanation:

If M is the midpoint, then

AM = MB

4x+18 = 3x+22

Subtract 3x from each side

4x-3x+18 = 3x-3x+22

x+18 = 22

Subtract 18 from each side

x+18-18 = 22-18

x = 4

But we need to find BM

BM = 3x+22

= 3(4)+22

12+22

What is the sum of the finite arithmetic series?4+8+12+16+...+76

a. 760
b. 780
c. 800
d. 860

Answers

The answer is A. I think. Hope this helped :)

The answer is:

a. 760

What is 4 divided by 1/6?

And can you show me how you got your answer?

Answers

4 / 1/6

Flip the 2nd fraction and multiply:

4 * 6/1

24

ok so
4÷1/6 is 0.666666666667
you just divide the whole number by the bottom one and that's how you get the answer. you might as well use a calculator

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