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Serga [27]
3 years ago
14

The hartford insurance company has hired you to poll a sample of adults about their car purchases. what is wrong with using tele

phone directories as the polpulation from which the sample?
Mathematics
1 answer:
lawyer [7]3 years ago
6 0

Answer:

Step-by-step explanation:

Given that the hartford insurance company has hired you to poll a sample of adults about their car purchases.

Here the insurance company is using convenience sampling to select customers so they resorted to taking the names from telephone directories.

But this may not be reliable since persons owning cars need not have telephones and similarly persons having telephones need not own cars

Owning a car and name appearing in telephone directory need not be associated at all

So taking random sample of names from telephone directories may not give the required accurate result since here sample cannot be assumed to represent the population of car owners.

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Software to detect fraud in consumer phone cards tracks the number of metropolitan areas where calls originate each day. It is f
pashok25 [27]

Answer:

0.999987

Step-by-step explanation:

Given that

The user is a legitimate one = E₁

The user is a fraudulent one = E₂

The same user originates calls from two metropolitan areas  = A

Use Bay's Theorem to solve the problem

P(E₁) = 0.0131% = 0.000131

P(E₂) = 1 - P(E₁)  = 0.999869

P(A/E₁) = 3%  = 0.03

P(A/E₂) = 30% = 0.3

Given a randomly chosen user originates calls from two or more metropolitan, The probability that the user is fraudulent user is :

P(E_2/A)=\frac{P(E_2)\times P(A/E_2)}{P(E_1)\times P(A/E_1)+P(E_2)\times P(A/E_2)}

=\frac{(0.999869)(0.3)}{(0.000131)(0.03)+(0.999869)(0.3)}

\frac{0.2999607}{0.00000393+0.2999607}

\frac{0.2999607}{0.29996463}

= 0.999986898 ≈ 0.999987

6 0
3 years ago
The area of a rectangle is 56 cm. The length is 2 cm more than x and the width is 5 cm less than twice x. Solve for x. Round to
mr Goodwill [35]
I hope this helps you


l=x+2


w=2x-5



(x+2)(2x-5)=56


2x^2-x-10=56


2x^2-x-66=0


2x +11


x -6



(2x+11)(x-6)=0


x=6
6 0
3 years ago
Ms. brown's class will raise rabbits for their spring science fair. they have 24 feet of fencing with which to build a rectangul
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Each side of the fence should have 6 feet if they have 24 feet and if they have 16 feet then each side will be 4 feet long.
7 0
3 years ago
What is another name for this polynomial based on the number of terms it contains
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The polynomial will be a binomial as it contains 2 terms. Both 5x^9 and 17x^5.
Both of these are found in the function labelled as g(x).
3 0
3 years ago
Marie will earn $15 per hour at a new job. During training, she will earn $10 per hour. What percent of Marie’s regular hourly r
Hitman42 [59]

Answer: 66.67%

Step-by-step explanation:

Given: The amount Marie will earn at a new job = $15 per hour

The amount she will earn during the training = $10 per hour

The percent of Marie’s regular hourly rate she will earn during training is given by :-

P=\frac{\text{Rate of amount she earn in training }}{\text{Rate of amount she earn at new job }}\times100\\\\\Rightarrow\ P=\frac{10}{15}\times100\\\\\Rightarrow\ P=66.66666\%\approx66.67\%

4 0
3 years ago
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