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tatyana61
8 days ago
10

A teacher wants to see if a new unit on factoring is helping students learn. She has five randomly selected students take a pre-

test and a post test on the material. The scores are out of 20. Has there been improvement? (pre-post) What value of t would you use for the 95% confidence interval?

Mathematics
1 answer:
tester [8.8K]8 days ago
4 0
The t-value used for the 95% confidence interval for paired data is 2.776. Step-by-step explanation: The confidence interval for the mean difference in paired data is defined by a specified formula. Here, the sample mean difference, the standard deviation of that difference, and the sample size (n) are integral. The critical t-value corresponds to the degrees of freedom, specifically n - 1, and with n being 5 and a confidence level of 95%, the critical value obtained from a t-table is 2.776.
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The sharks are fed three times a day. During the morning feeding , 2/15 tons of fish is fed. During the afternoon feeding, the w
zzz [9080]

Answer:

1/6 ton of fish is provided during the night feeding.

Step-by-step explanation:

The fish consumed in the morning is \dfrac{2}{15} tons, and the amount of fish served in the afternoon is \dfrac{1}{15} greater than in the morning. This means

\dfrac{2}{15} +\dfrac{1}{15}

Let’s represent the quantity of fish given at night as x, and if the total fish fed throughout the day equals \dfrac{1}{2}, we have

\dfrac{2}{15}+(\dfrac{2}{15} +\dfrac{1}{15})+x=\dfrac{1}{2}

By summing the numerators on the left side, we derive:

\dfrac{5}{15} +x=\dfrac{1}{2}

and subtracting \dfrac{5}{15} from both sides allows us to isolate x:

x=\dfrac{1}{2} -\dfrac{5}{15}

Since \dfrac{5}{15} =\dfrac{1}{3}, we derive

x=\dfrac{1}{2}-\dfrac{1}{3}

The common denominator for the fractions is 6; hence, we write the equation in the form

x=\dfrac{3}{6}-\dfrac{2}{6}

and simplifying the numerators results in:

\boxed{x=\dfrac{1}{6} }

which indicates the amount of tons fed during the night feeding.

7 0
10 days ago
In which diagram are angles 1 and 2 vertical angles?
PIT_PIT [9117]

Response

The first diagram displays angles 1 and 2 as vertical angles.

Clarification

In all four diagrams, the initial one illustrates the vertically opposite angles.

Angles 1 and 2 are classified as vertically opposite because they face each other.

These angles maintain equal measurement when two lines intersect, resulting in four angles where two pairs of vertically opposite angles are formed.

In contrast, all other figures depict angles 1 and 2 as adjacent angles.

6 0
21 day ago
Read 2 more answers
It takes your garden hose 20 seconds to fill your 2-gallon watering can. How long will it take to fill
zzz [9080]

Answer: a) 1791 seconds

b) 29701 seconds

Step-by-step breakdown:

1 US gallon = 0.134 cubic feet

It takes 20 seconds to fill a 2-gallon watering can with the garden hose. Converting 2 gallons into cubic feet results in

2 × 0.134 = 0.268 cubic feet

a) The inflatable pool has dimensions of 3 feet wide, 8 feet long, and 1 foot deep.

Volume = 3 × 8 × 1 = 24 cubic feet

If it takes 0.268 cubic feet = 20 seconds

Then 24 cubic feet = (24 × 20)/0.268

= 1791 seconds

b) The formula for the volume of a cylinder is πr²h

Diameter = 13 feet

Radius = diameter/2 = 13/2 = 6.5

The circular pool's volume calculates to

3.14 × 6.5² × 3 = 397.995 cubic feet

If it takes 0.268 cubic feet = 20 seconds

Then 397.995 cubic feet = (397.995 × 20)/0.268

= 29701 seconds

5 0
21 day ago
A=9y+3yx solve for y
Inessa [9000]
The solution for y is y = \frac{a}{3(3 + x)}
3 0
1 month ago
Read 2 more answers
Which decimal is equivalent to \dfrac{4}{3} 3 4 ​ start fraction, 4, divided by, 3, end fraction? Choose 1 answer: Choose 1 answ
Svet_ta [9500]

Answer:

The correct choice is option D.

Detailed explanation:

Any fraction where m > n can be represented as a/b

where a = quotient

b = remainder.

The specified number is given as m/n.

3)4( 1 ← quotient

- 3

____

   1 ← remainder

In this case, quotient= 1, remainder=1, and n=3.

\therefore \frac43=1\frac13.

7 0
20 days ago
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