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Lilit [14]
3 years ago
12

Data was collected from a simple random sample of 200 cell phone users age 18 or older in the United States. Each user was categ

orized by age-group and by whether he or she uses a certain cell phone app. The table shown summarizes the data, with expected cell counts in parentheses.
Uses Cell Phone App
Yes No Total
Age-Group Young Adults 4 (15.2) 76 (64.8) 80
Older Adults 29 (19.38) 73 (82.62) 102
Elderly Adults 5 (3.42) 13 (14.58) 18
Total 38 162 200
Which statement is true about whether the conditions for a chi-square test for independence have been met?
A. All necessary conditions are satisfied to apply a chi-square test for independence between age group and texting use by cell phone users.
B. The data from the different age groups are not the result of independent random samples; therefore, the conditions for the test are not met
C. The total sample size in one or more of the age-groups is too small to meet the conditions of the chi-square test for independence.
D. Not all of the observed cell counts are large enough to satisfy the conditions for the chi-square test for independence.
E. Not all of the expected cell counts are large enough to satisfy the conditions for the chi-square test for independence
Mathematics
2 answers:
frutty [35]3 years ago
6 0

Answer:

D

Step-by-step explanation:

i took it

Oduvanchick [21]3 years ago
3 0

Answer:

d

Step-by-step explanation:

my stats teacher went over it

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ANSWER QUICK I AM GIVING 25 POINTS AND MARKING BRAINLIEST PLEASE HELP THANK YOUUU! no explanation needed btw just tell me a, b,
Vesnalui [34]

9514 1404 393

Answer:

  C.  25/6 ft²

Step-by-step explanation:

Let's call the dimensions of Rectangle B x and y. Then ...

  xy = 5 ft²

and

  x² = 6 ft²

We want to find the value of y². Solving the first equation for y, then substituting for x², we have ...

  y = (5 ft²)/x

  y² = ((5 ft²)/x) = 25 ft⁴/x² = 25 ft⁴/(6 ft²)

  y² = (25/6) ft² . . . . . . . matches choice C

8 0
3 years ago
Identify the equation in slope-intercept form for the line containing the point (-4,1) and (2,3)
oksano4ka [1.4K]

Answer:

The point slope formula is

(y−y1)=m(x−x1)

Where m = the slope calculated as y2−y1x2−x1

(x1,y1)(x2,y2)

(-4 , 1) (-2 , 3)

Solve for the slope

m = 3−1−2−(−3) = 21 = m = 2

(y−3)=2(x−(−2)) Plug in known values.

y−3=2(x+2) Simplify signs

y−3=2x+4 Use Distributive property

y=−2x+4+3 isolate the y variable

answer (y = −5x+7 ) Simplify

7 0
2 years ago
How do you calculate 278 × 11 using estimation?<br>​
neonofarm [45]

Answer:

2800

Step-by-step explanation:

round 278 to 280

then round 11 to 10

then times the 2 answers together

8 0
3 years ago
Read 2 more answers
Which shows one way to determine the factors of x3 + 5x2 – 6x – 30 by grouping?
frutty [35]

Answer:

D

Step-by-step explanation:

group them first :

( x3+5x2) and ( -6x-30)

then simply by gcf ( greatest common factor) :

x2(x+5) and -6(x+5)

and just add them together:

x2(x+5)-6(x+5)

bonus :

it can be written as (x2-6)(x+5)

6 0
3 years ago
In the last six months, Sonia's family used 529, 499, 651, 652, 1,163, and 310 minutes on their cell phone plan. To save money,
Tresset [83]

Answer:

They went over their goal for the last six months by 34 minutes per month.

Step-by-step explanation:

Mean of a data-set:

The mean of a data-set is the sum of all values in the data-set divided by the size of the data-set.

529, 499, 651, 652, 1,163, and 310 minutes on their cell phone plan.

The mean is:

M = \frac{529+499+651+652+1163+310}{6} = 634

By how many minutes did they go over their goal in the last six months?

The mean was of 634 minutes, and they wanted to keep it below 600. So

634 - 600 = 34

They went over their goal for the last six months by 34 minutes per month.

4 0
3 years ago
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