If The price tag on a trumpet says 104 how much did the store pay for it

Researchers conducted a study to determine the monthly rental cost of rent-controlled apartments in the five boroughs of New Yor

Mariulka [41]

Answer:

Researchers are 95% certain that the interval ($2005.76, $2024.24) contains the mean monthly rental cost of all rent-controlled apartments in Brooklyn.

Step-by-step explanation:

Last part of the question and choices are missing. Full question is like this:

Researchers conducted a study to determine the monthly rental cost of rent-controlled apartments in the five boroughs of New York City in 2012. The study randomly sampled 203 apartment records from Brooklyn, obtained from a large collection of income- and expense-filing statements. The 95% confidence interval of rent-controlled apartment costs in Brooklyn was $1,025.00 ± ± $9.24. The cost of all rent-controlled apartments in Brooklyn has a standard deviation of $67.20. State the conclusion of the z z -confidence interval for the mean.

Researchers are ________certain that the interval ($2005.76, $2024.24) contains the mean monthly rental cost of _____.

all rent-controlled apartments in New York City.

all rent-controlled apartments in Brooklyn.

the 98 apartments in the sample.

all apartments in Brooklyn.

Confidence Intervals give a range of values that the statistic (mean cost of all rent-controlled apartments in Brooklyn) can assume in a confidence level (95%). Confidence levels give the levels we can be sure (95%) that the statistic falls within the interval.

Since the sample is about the rent-controlled apartments in Brooklyn, the confidence interval gives an estimate of the rent-controlled apartments in Brooklyn, not in New York.

8 0

3 years ago

Need help and explain please!!

lukranit [14]

Answer:

$x=-4\text{ and } x=3$

Step-by-step explanation:

We are given the second derivative:

$g''(x)=(x-3)^2(x+4)(x-6)$

And we want to find its inflection points.

To do so, we will first determine possible inflection points. These occur whenever g''(x) = 0 or is undefined.

Next, we will test values for the intervals. Inflection points occur if and only if the sign changes before and after the point.

So first, finding the zeros, we see that:

$0=(x-3)^2(x+4)(x-6)\Rightarrow x=-4, 3, 6$

So, we can draw the following number-line:

<----(-4)--------------(3)----(6)---->

Now, we will test values for the intervals x < -4, -4 < x < 3, 3 < x < 6, and x > 6.

Testing for x < -4, we can use -5. So:

$g^\prime^\prime(-5)=(-5-3)^2(-5+4)(-5-6)=704>0$

Since we acquired a positive result, g(x) is concave up for x < -4.

For -4 < x < 3, we can use 0. So:

$g^\prime^\prime(0)=(0-3)^2(0+4)(0-6)=-216$

Since we acquired a negative result, g(x) is concave down for -4 < x < 3.

And since the sign changed before and after the possible inflection point at x = -4, x = -4 is indeed an inflection point.

For 3 < x < 6, we can use 4. So:

$g^\prime^\prime(4)=(4-3)^2(4+4)(4-6)=-16$

Since we acquired a negative result, g(x) is concave down for 3 < x < 6.

Since the sign didn't change before and after the possible inflection point at x = 3 (it stayed negative both times), x = -3 is not a inflection point.

And finally, for x > 6, we can use 7. So:

$g^\prime^\prime(7)=(7-3)^2(7+4)(7-6)=176>0$

So, g(x) is concave up for x > 6.

And since we changed signs before and after the inflection point at x = 6, x = 6 is indeed an inflection point.

3 0

3 years ago

Each of the 10 students in the baking club made 2 chocolate cakes for a fundraiser. They all used the same recipe, using c cups

almond37 [142]

Answer:

h6hhh6hh7hh

Step-by-step explanation:

7 7mm88mjui8iiikji

5 0

2 years ago

Three more than the quotient of a number and 7 is at most 92. Find the number

Gelneren [198K]

Answer:

The number is 623.

Step-by-step explanation:

$\frac{x}{7}+3 =92\\\frac{x}{7} =89\\x=623$

4 0

3 years ago

Jackson wants to divide a

Dmitry [639]

Answer:

well to make it easier i will make 3/4 equilvilent to 1/12

so 4 * 3= 12 so then that means i times 3*3=9

so 3/4=9/12

and if each bag is 1/12 pounds then Jackson can fill 9 whole bags with trail mix

Step-by-step explanation:

6 0

3 years ago