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omeli [17]
3 years ago
7

A study was conducted to determine whether big-city and small-town dwellers differed in their helpfulness to strangers. In this

study, the investigators rang the doorbells of strangers living in New York City or small towns in the vicinity. They explained they had misplaced the address of a friend living in the neighborhood and asked to use the phone. The following data show the number of individuals who admitted or did not admit the strangers (the investigators) into their homes:
Helpfulness to Strangers
Admitted strangers into their home Did not admit strangers into their home

Big-city dweller 55 85 140
Small-town dweller 73 41 114
128 126 254

Required:
Do big-city dwellers differ in their helpfulness to strangers? Use α = 0.05 in making your decision.
Mathematics
1 answer:
zaharov [31]3 years ago
5 0

Answer:

Stranger things

Step-by-step explanation:

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In a triangle the first angle is greater than the second angle by 18 degree and less than the third angle by 10 grade. Express a
serg [7]

Answer:

The 3 angles are 62 2/3, 44 2/.3 and 72 2/3 degrees.

Step-by-step explanation:

let x be the first angle then the  the second angle is  x - 18 and the third angle = x + 10

The 3 angles add up to 180 so:

x + x - 18 + x + 10 = 180

3x = 180 + 18 - 10 = 188

x = 188/3 = 62 2/3 degrees.

x - 18 = 44 2/3

x + 10 = 72 2/3.

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Troyanec [42]

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2 years ago
I'm sorry it's upside down​
natita [175]

Answer:

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8 0
3 years ago
How is -16/20 and 20/-25 represent the same rational number
sammy [17]

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Find z1z2 if z1 = 2/5(cos63° + isin63°) and z2 = 10/3(cos117° + isin117°).
Airida [17]

Answer:

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Step-by-step explanation:

Given are two complex numbers as

z1=\frac{2}{5} (cos63  + isin63)\\z2=\frac{10}{3} (cos 117 + isin117})

Recall Demoivre theorem as

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7 0
3 years ago
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