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vivado [14]
3 years ago
9

Solve for X Q |2x° 8 8. 52

Mathematics
1 answer:
Over [174]3 years ago
6 0

Answer:

8.

Step-by-step explanation:

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An educational psychologist wishes to know the mean number of words a third grader can read per minute. She wants to make an est
antiseptic1488 [7]

Answer:

The 95% confidence interval for the mean number of words a third grader can read per minute is (23.8, 24.4).

Step-by-step explanation:

We have to find our \alpha level, that is the subtraction of 1 by the confidence interval divided by 2. So:

\alpha = \frac{1 - 0.95}{2} = 0.025

Now, we have to find z in the Z-table as such z has a p-value of 1 - \alpha.

That is z with a p-value of 1 - 0.025 = 0.975, so Z = 1.96.

Now, find the margin of error M as such

M = z\frac{\sigma}{\sqrt{n}}

In which \sigma is the standard deviation of the population and n is the size of the sample.

M = 1.96\frac{3.7}{\sqrt{582}} = 0.3

The lower end of the interval is the sample mean subtracted by M. So it is 24.1 - 0.3 = 23.8

The upper end of the interval is the sample mean added to M. So it is 24.1 + 0.3 = 24.4.

The 95% confidence interval for the mean number of words a third grader can read per minute is (23.8, 24.4).

5 0
3 years ago
Find the product: (1.2) · (0.11)
Lina20 [59]

Answer:

The answer is 0.132

Step-by-step explanation:

12/10*11/100

132/1000

=0.132

7 0
3 years ago
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The average price of a movie ticket in the United States from 1980 to 2000 can be modeled by the expression, 2.75+0.10x, where x
Dafna11 [192]

Answer:

$2.75

Step-by-step explanation:

Since x represents the number of years since 1980 to 2000 that means the ticket prices increase by 0.10 (or 10 cents) each year. This means the base price in 1980 was $2.75. To prove it, we would plug in the correct information into the expression. The number of years since 1980 would be 0 so we would plug in 0 for x. 2.75 + 0.10(0) = $2.75.

7 0
4 years ago
Answer for brainliest!
MAVERICK [17]

Answer:

i think it's C

Step-by-step explanation:

4 0
3 years ago
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PLEASE HELP ME.. (no links)
Gnesinka [82]

Answer:

I think it is c

Step-by-step explanation:

4 0
3 years ago
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