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3 years ago

11

If the price of a soda was 15 cents in 1970, when the CPI was 50, and 50 cents in 2007 when the CPI was 172, then the real price

of the 1970 soda in terms of 2007 dollars is?

1 answer:

bazaltina [42]3 years ago

4 0

Answer:

0.16

Step-by-step explanation: hope it's helpful

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Guess how many pieces of candy corn. It's a three digit odd number less than 200. It is divisible by 7. The number in the ones p

Vera_Pavlovna [14]

Little late, but your answer would be 133 pieces of candy corn.

Best of luck.

4 0

3 years ago

A simple random sample of 90 is drawn from a normally distributed population, and the mean is found to be 138, with a standard d

bagirrra123 [75]

The 90% confidence interval for the population mean of the considered population from the given sample data is given by: Option C: [130.10, 143.90]

<h3>
How to find the confidence interval for population mean from large samples (sample size > 30)?</h3>

Suppose that we have:

Sample size n > 30
Sample mean = $\overline{x}$
Sample standard deviation = s
Population standard deviation = $\sigma$
Level of significance = $\alpha$

Then the confidence interval is obtained as

Case 1: Population standard deviation is known

$\overline{x} \pm Z_{\alpha /2}\dfrac{\sigma}{\sqrt{n}}$

Case 2: Population standard deviation is unknown.

$\overline{x} \pm Z_{\alpha /2}\dfrac{s}{\sqrt{n}}$

For this case, we're given that:

Sample size n = 90 > 30
Sample mean = $\overline{x}$ = 138
Sample standard deviation = s = 34
Level of significance = $\alpha$ = 100% - confidence = 100% - 90% = 10% = 0.1 (converted percent to decimal).

At this level of significance, the critical value of Z is: $Z_{0.1/2}$ = ±1.645

Thus, we get:

$CI = \overline{x} \pm Z_{\alpha /2}\dfrac{s}{\sqrt{n}}\\CI = 138 \pm 1.645\times \dfrac{34}{\sqrt{90}}\\\\CI \approx 138 \pm 5.896\\CI \approx [138 - 5.896, 138 + 5.896]\\CI \approx [132.104, 143.896] \approx [130.10, 143.90]$

Thus, the 90% confidence interval for the population mean of the considered population from the given sample data is given by: Option C: [130.10, 143.90]

Learn more about confidence interval for population mean from large samples here:

brainly.com/question/13770164

3 0

2 years ago

Find the slope and the y-intercept in this equation: 3y+6=-2x

Dmitry [639]

Hello,

To solve this problem, you should first put in it slope intercept form.

Here are the steps:

3y + 6 = -2x Add 6 to both sides
3y = -2x - 6 Divide both sides by 3
y = (-2/3)x - 2

The you can see that the slope is (-2/3) and the y-intercept is (0, -2).

I hope this helps,
MrEQ

7 0

4 years ago

Read 2 more answers

How would you write 1 - x^4 before you divide it by x - 1?

devlian [24]

Order your terms by the powers of exponents in decreasing order (as is the case with pure number division hundreds, tens, ones, tenths, etc, etc) as x^n, x^n-1 etc...

(-x^4+1)/(x-1)
-x^3 rem -x^3-1
-x^2 rem -x^2-1
-x rem -x-1
-1 rem 0

(x-1)(-x^3-x^2-x-1)

(x-1)(-x^3-x-x^2-1)

(x-1)(-x(x^2+1)-1(x^2+1))

(x-1)(-x-1)(x^2+1)

8 0

4 years ago

In a phase test paper positive and negative marks are provided. If a student gets 32, - 6, 18, -3, 18, -9 in 6 consecutive paper

melamori03 [73]

Answer:

50

Step-by-step explanation:

32 - 6 = 26

26 + 18 = 44

44 - 3 = 41

41 + 18 = 59

59 - 9 = 50

3 0

3 years ago