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aleksandrvk
2 months 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:
zzz [12.3K]2 months ago
8 0

Answer:

2.1/√55

Step-by-step explanation:

standard deviation divided by the sample size

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A billfold holds one-dollar, five-dollar, and ten-dollar bills and has a value of $210. There are 50 bills total where the numbe
AnnZ [12381]

Answer:

25 one-dollar bills, 13 five-dollar bills, and 12 ten-dollar bills.

Step-by-step explanation:

The equations that can be formed are:

x+y+z=50 (1)

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x= 2y-1 (3)

where x = number of one-dollar bills,[tag_20] y = number of five-dollar bills,

z = number of ten-dollar bills

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2y-1+y+z= 50

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3y+z=51 (4)

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3 0
1 month ago
Carmen is planning rail lines for a new train station. Help her find m1. Explain how you found  that solution.
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I have included a screenshot of the entire question along with its accompanying diagram.

Answer:
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Explanation:
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Since lines a and b are parallel, ∠1 and ∠2 are alternate angles and therefore equal.
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I hope this clarifies things!:)

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1 month ago
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Greetings!

The conclusion is:

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Response:c

Detailed explanation:

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