7. Cathy spent of an hour on her math homework,

2 answers:

5 0

Answer:1 hour+1 hour+1 hour=3 hours

Step-by-step explanation:This is because she worked 1 hour on each homework.and there is 3 homework. Think is this way 3 groups of 1

1 1 1

3 homework and 1 hour each.

4 0

Answer:

3 hours or 180 minutes

Step-by-step explanation:

1 hour for math

1 hour for science

1 hour for reading

Equals 3 hours or 180 minutes

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Nookie1986 [14]

Answer:

$n = \frac{2}{3}$

I hope this helps!

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3 years ago

lilavasa [31]

The following is the most appropriate method for investigating the sociologist’s belief is,

A. A one-sample zz-test for a difference in population proportions

Step-by-step explanation:

The young adults in a county get their news from online sources are 75 percent.

But according to sociologist the percentage is actually greater than 75 percent.
The correct answer is A one-sample zz-test for a difference in population proportions.
The One proportion Z-test is used to compare proportion which is observed to a theoretical one, only when there are only two categories.
A z-test is a statistical test which is used to determine whether there are two population which means there are different when the variances are known and the sample size is relatively large.