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azamat
3 years ago
5

Help me please its due today and have no idea how to do it. Its sooo confusing...

Mathematics
1 answer:
matrenka [14]3 years ago
3 0

you need to add a picture, we can't see what it is

make a new question and attach a screenshot/picture of the problem <3

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A teacher wants to estimate the mean time (in minutes) that students take to go from one classroom to the next. His research ass
PilotLPTM [1.2K]

Answer:

a:  We can't determine this from the given information

b: 98%

Step-by-step explanation:

For a:

n = 42

The confidence interval has equal time on each side of µ, so we can add the two end points and divide them by 2 to find the middle of the interaval:

7.4 + 8.6 = 16

16/2 = 8

Now subtract 7.4 from 8 to find the distance from the mean to the end of the interval

8 - 7.4 = 0.6

So the sample mean, plus the calculated error was 0.6 minutes.

We don't have a way of calculating the sample mean with the given information.  We could only find the sample standard deviation and the variance.

For b:  

We have:

E = 0.6

s = 1.606

n = 42

See attached photo for the calculation of this value

The value is 2.421.

Using a sample size of 42, our degrees of freedom are 41.  Use the t-distribution chart to see which level of confidence has 2.421 under it.

The level of confidence is: 98%

We need 41 degrees of freedom, but the chart has only 40, then 45.  We can see that 40 has 2.423, and the values go down as the degrees of freedom go up, so 41 will correlate to 2.421

6 0
4 years ago
Solve the following equation. Determine if the equation is an "identity" or "contradiction."
Leona [35]
To solve, we must get x by itself. the first step we must take is to remove all of the parentheses. To do this, we must use distribution to multiply 5 by x - 6.

5(x - 6) = 3x - 18 + 2x

5x - 30 = 3x - 18 + 2x

Next, we must add like terms.

5x - 30 = 5x - 18

Finally, we must get x by itself. to do this, we must subtract 5x from both sides.

5x - 30 - 5x = 5x - 18 - 5x

Then, we add like terms again.

-30 = -18

Because this is a false statement, the equation is a contradiction.
8 0
4 years ago
What is 470,925.8 in expanded form
ICE Princess25 [194]

470,925.8 in expanded form is ...

400,000 + 70,000 + 900 + 20 + 5 + 0.8

Hope this helps

Brainliest is always appreciated

Give me a thanks

3 0
3 years ago
Read 2 more answers
Find the slope of the line through the given pair of points.<br> (-11,-4).(-6,5)
Bas_tet [7]

✍️

The answer is ✊✌️I forgot the answer but hanks for the points

6 0
3 years ago
Hey guys whats the better deal 56/25 or 32.05/15
Ray Of Light [21]

56/25 = 2.24

32.05/15= 2.13666..


If you're looking for a larger value 56/25 is your answer.

7 0
3 years ago
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