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Harman [31]
3 years ago
14

a bookstore ownwr wants to know which department to expand. manager A surveys every 3rd teenager that comes in the store. manage

r B surveys every customer on monday evening. manager C surveys 25% of the customers chosen at random from the store's mauling lost. which manager's method is the least biased? explain?​
Mathematics
1 answer:
Artyom0805 [142]3 years ago
8 0

Answer:

Manager C.

Step-by-step explanation:

This is because they are asking people at random on a random day instead of---

teenagers who typically don't like to read what adults do

or

people who come on Monday night because a teenager has to go to school Mondays and typically have homework so they cant get out

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A company has 31 salespeople. A board member at the company asks for a list of the top 4 salespeople, ranked in order of effecti
kvv77 [185]

Answer:

31465 ways

Step-by-step explanation:

Given data

Let us apply the combination formula

nCr = n! / r! * (n - r)!

n= 31

r= 4

substitute

= 31!/4!(31-4)!

= 31!/4!(27)!

= 31*30*29*28*27!/ 4!(27)!

= 31*30*29*28/4!

=31*30*29*28/4*3*2*1

=755160/24

=31465 ways

Hence there are 31465 possible ways to rank it

8 0
3 years ago
What is 8c squared + 7c
MariettaO [177]
(8c)^2+7c
(8c)^2=64c^2
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64c^2+7c
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c(64c+7)
8 0
3 years ago
Will give brainliest
posledela

Answer:

8

Step-by-step explanation:

hope it will help good luck

7 0
3 years ago
Gemma recently rode her bicycle to visit her friend who lives 6 miles away. On her way there, her average speed was 16 miles per
DochEvi [55]

first speed --- x mph

return speed -- x+16 mph

6/x + 6/(x+16) = 1

times each term by x(x+16)

6(x+16) + 6x = x(x+16)

x^2 + 4x - 96 = 0

(x-8)(x+12) = 0

x = 8 or x is a negative

her first speed was 8 mph

her return speed was 24 mph

check:

6/8 + 6/24 = 1 , that's good!

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The null hypothesis and the alternate hypothesis are: H0: The frequencies are equal. H1: The frequencies are not equal. Category
OLga [1]

Answer:

Reject H0

Step-by-step explanation:

Given :

H0: The frequencies are equal. H1: The frequencies are not equal

Category f0 A 10 B 30 C 30 D 10

Total f0 = (10 + 30 + 30 + 10) = 80

Expected frequency is the same for all categories :

Expected frequency = 1/4 * 80 = 20

χ² = Σ(observed - Expected)² / Expected

χ² = (10-20)^2 / 20 + (30-20)^2 /20 + (30-20)^2 / 20 + (10-20)^2 / 20

χ² = (5 + 5 + 5 + 5) = 20

Pvalue = 0.00017

Pvalue < α

5 0
3 years ago
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