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givi [52]
4 years ago
12

A sociologist studying the difference in ages between husbands and wives obtained a random sample of 55 married couples. The mea

n of the husbands’ ages was 38.5 years with standard deviation 12.6 years. The mean of the wives’ ages was 36.9 years with standard deviation 12.4 years. The sociologist calculated the difference between the ages for each couple. The mean difference was 1.6 years with standard deviation 2.1 years. A matched-pairs hypothesis test will be performed to investigate whether the difference is significant.
Mathematics
1 answer:
zalisa [80]4 years ago
8 0

Answer:

2.1/√55

Step-by-step explanation:

simga divided by sample size

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Which statement correctly describes this expression?<br> 2m^3 - 11
Nady [450]

Answer:

<h2>D</h2>

The cube of twice a number decreased by 11

6 0
3 years ago
PLEASE HELP I REALLY NEED IT
Snezhnost [94]
We know that
the x-intercepts of the quadratic function f(x)=x²<span>−3x−10 is when 
f(x)=0

</span>x²−3x−10=0

Group terms that contain the same variable, and move the constant to the opposite side of the equation

(x²−3x)=10

Complete the square. Remember to balance the equation by adding the same constants to each side.

(x²−3x+2.25)=10+2.25

Rewrite as perfect squares

(x-1.5)²=12.25----------> (+/-)[x-1.5]=3.5

(+)[x-1.5]=3.5----> x1=5
(-)[x-1.5]=3.5-----> x2=-2
<span>
the answer is
</span>the x-intercepts of the quadratic function are
<span>x=5
x=-2


</span>
6 0
3 years ago
Solve x - 3 1/8 = 5/12
Anna007 [38]

Answer:

\large\boxed{x=\dfrac{85}{24}=3\dfrac{13}{24}}

Step-by-step explanation:

Convert the mixed number to the fraction:

3\dfrac{1}{8}=\dfrac{3\cdot8+1}{8}=\dfrac{25}{8}

METHOD 1:

x-3\dfrac{1}{8}=\dfrac{5}{12}\\\\x-\dfrac{25}{8}=\dfrac{5}{12}\\\\\text{the common denominator is 24}\\\\x-\dfrac{25}{8}=\dfrac{5}{12}\qquad\text{multiply both sides by 24}\\\\24x-(3)(25)=(2)(5)\\\\24x-75=10\qquad\text{add 75 to both sides}\\\\24x=85\qquad\text{divide both sides by 24}\\\\\boxed{x=\dfrac{85}{24}}

METHOD 2:

x-3\dfrac{1}{8}=\dfrac{5}{12}\qquad\text{add}\ 3\dfrac{1}{8}\ \text{to oboth sides}\\\\x=\dfrac{5}{12}+3\dfrac{1}{8}\\\\x=\dfrac{5\cdot2}{12\cdot2}+3\dfrac{1\cdot3}{8\cdot3}\\\\x=\dfrac{10}{24}+3\dfrac{3}{24}\\\\x=3\dfrac{10+3}{24}\\\\\boxed{x=3\dfrac{13}{24}}

7 0
4 years ago
NEED HELP WHAT ARE THSES TWOO!!
lozanna [386]
Answer:
No and No

(I didn’t actually say no, I mean like both answers are no.)

I hope I was right.
Have a nice day
8 0
3 years ago
Find the values of T in T = 3x + 2 when x equals the given amounts. <br><br> x = 1
Arisa [49]
The answer you are looking for would be "T = 5"

To find "T", you'd replace the "X" with the value stated (1). This would give you "T = 3*1 + 2". Solving for "T" can be done by using PEMDAS. First, multiply 3 and 1. This gives you 3, which you then add 2 to. Giving you a final answer of "T = 5".

I hope this helps!
4 0
4 years ago
Read 2 more answers
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