Ask question

Ask question

All categories

3 years ago

8

Form a normally distributed population, a simple random sample of size 30 is taken. the mean of the sample is 144 and the standa

rd deviation of the sample is 12. which interval is the 90% confidence interval for the population mean?

1 answer:

Kisachek [45]3 years ago

3 0

The answer I think is D.

You might be interested in

Sarah received a gift in a rectangular box with a volume of 240 in3. If the base of the box was 20 in2, how tall was the box?

Murrr4er [49]

V = l * w * h
240 = 20* h
divide both sides by 20
12 = h
height = 12 inches

8 0

2 years ago

Read 2 more answers

crimeas [40]

Answer:

The zeros are:

$x =4, x=2, x = 5$

The function has three distinct real zeros.

Hence, option (B) is true.

Step-by-step explanation:

Given the expression

$h\left(x\right)=\left(x-4\right)^2\left(x^2-7x+\:10\right)$

Let us determine the zeros of the function by putting h(x) = 0 and solving the expression

$0=\left(x-4\right)^2\left(x^2-7x+10\right)$

switch sides

$\left(x-4\right)^2\left(x^2-7x+10\right)=0$

as

$x^2-7x+\:10=\left(x-2\right)\left(x-5\right)$

so

$\left(x-4\right)^2\left(x-2\right)\left(x-5\right)=0$

Using the zero factor principle

$\mathrm{If}\:ab=0\:\mathrm{then}\:a=0\:\mathrm{or}\:b=0\:\left(\mathrm{or\:both}\:a=0\:\mathrm{and}\:b=0\right)$

so

$x-4=0\quad \mathrm{or}\quad \:x-2=0\quad \mathrm{or}\quad \:x-5=0$

$x =4, x=2, x = 5$

Thus, the zeros are:

$x =4, x=2, x = 5$

It is clear that there are three zeros and all the zeros are distinct real numbers.

Therefore,

The function has three distinct real zeros.

Hence, option (B) is true.

4 0

2 years ago

Would you set them equal to each other or 90 or 180. HELP ASAP

Ghella [55]

Answer:

90

Step-by-step explanation:

bc i said so

5 0

3 years ago

The radius of the circle - shaped poster is 9 inches. What is the approximate circumference?

statuscvo [17]

Answer: $56.55inch$

Step-by-step explanation:

Circumference formula: $C = 2\pi r$

$C = 2(3.1416)(9inch)$

$C= 56.55inch$

5 0

3 years ago

In January, Emma was 62.25 in tall. In December, she was 65.5 inches tall. How much did Emma grow between January and December?

WINSTONCH [101]

she "grew" negative 3.25 inches

it is negative because she was taller in December than she was in January

5 0

3 years ago