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lesya [120]
3 years ago
15

2b-m=5 what is the solution for m

Mathematics
1 answer:
7nadin3 [17]3 years ago
6 0

Answer:

m = -5 + 2b

Step-by-step explanation:

2b - m = 5

<u>-2b    -2b</u>

<u>-m</u> = <u>5 - 2b</u>

-1         -1

5 ÷ -1 = 5

-2b ÷ -1 = 2b

m = -5 + 2b

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A survey of 1100 adults from a certain region​ asked, "If purchasing a used car made certain upgrades or features more​ affordab
Sergio039 [100]

Answer:

a) The p-value of the test is 0.0076 < 0.05, which means that there is evidence of a difference between males and females in the proportion who said they prefer window tinting as a luxury upgrade at the 0.05.

b) The null hypothesis is H_0: \pi_1 - \pi_2 = 0 and the alternate hypothesis is H_1: \pi_1 - \pi_2 \neq 0.

Step-by-step explanation:

Before testing the hypothesis, we need to understand the central limit theorem and subtraction of normal variables.

Central Limit Theorem

The Central Limit Theorem establishes that, for a normally distributed random variable X, with mean \mu and standard deviation \sigma, the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean \mu and standard deviation s = \frac{\sigma}{\sqrt{n}}.

For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.

For a proportion p in a sample of size n, the sampling distribution of the sample proportion will be approximately normal with mean \mu = p and standard deviation s = \sqrt{\frac{p(1-p)}{n}}

Subtraction between normal variables:

When two normal variables are subtracted, the mean is the difference of the means, while the standard deviation is the square root of the sum of the variances.

Females:

49% from a sample of 600. So

\pi_1 = 0.49, s_{\pi_1} = \sqrt{\frac{0.49*0.51}{600}} = 0.0204

Males:

41% from a sample of 500. So

\pi_2 = 0.41, s_{\pi_2} = \sqrt{\frac{0.41*0.59}{500}} = 0.022

Test if there is a difference between males and females in the proportion who said they prefer window tinting as a luxury upgrade.

From here, question b can already be answered.

At the null hypothesis we test if there is no difference, that is, the subtraction of the proportions is 0. So

H_0: \pi_1 - \pi_2 = 0

At the alternate hypothesis, we test if there is a difference, that is, the subtraction of the proportions is different of 0. So

H_1: \pi_1 - \pi_2 \neq 0

The test statistic is:

z = \frac{X - \mu}{s}

In which X is the sample mean, \mu is the value tested at the null hypothesis, and s is the standard error.

0 is tested at the null hypothesis:

This means that \mu = 0

From the two samples:

X = \pi_1 - \pi_2 = 0.49 - 0.41 = 0.08

s = \sqrt{s_{\pi_1}^2 + s_{\pi_2}^2} = \sqrt{0.0204^2 + 0.022^2} = 0.03

Value of the test statistic:

z = \frac{X - \mu}{s}

z = \frac{0.08 - 0}{0.03}

z = 2.67

Question a:

P-value of the test and decision:

The p-value of the test is the probability that the sample proportion differs from 0 by at least 0.08, which is P(|Z| > 2.670, which is 2 multiplied by the p-value of Z = -2.67.

Looking at the z-table, Z = -2.67 has a p-value of 0.0038.

2*0.0038 = 0.0076

The p-value of the test is 0.0076 < 0.05, which means that there is evidence of a difference between males and females in the proportion who said they prefer window tinting as a luxury upgrade at the 0.05.

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Simplify the expression please help ASAP
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Answer:

maybe answer c/3 or b/2

Step-by-step explanation:

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Amanda deposited 4000 into an account with 3.7% interest, compounded quarterly. Assuming that no withdrawals are made, how much
kondor19780726 [428]

Interest on interest, or compound interest, is the adding of interest to the principal sum of a loan or deposit. The amount that will be in Amanda's account after a period of 8 years is $5,370.57.

<h3>What is compound interest?</h3>

Interest on interest, or compound interest, is the adding of interest to the principal sum of a loan or deposit. It's the outcome of reinvesting interest rather than paying it out so that interest is received on the principal plus previously collected interest in the next quarter.,

The formula for compound interest is written as,

A = P(1+\dfrac{r}{n})^{n \times t}

A is the final amount

P is the principal amount

r is the rate of interest

n is the number of times the money is compounded in a year

t is the number of years

Given the following details about the account that Amanda owns,

The Principal amount, P is $4000; the rate of interest (r) is 3.7%; the amount is compounded quarterly, therefore, n=4. Also, the amount is invested for a period of 8 years. Thus, the amount in the account after 8 years will be,

A = P(1+\dfrac{r}{n})^{n \times t}\\\\A= \$4,000  \times (1+\dfrac{0.037}{4})^{4 \times 8}\\\\A = \$5,370.57

Hence, the amount that will be in Amanda's account after a period of 8 years is $5,370.57.

Learn more about Compound Interest:

brainly.com/question/25857212

#SPJ1

5 0
2 years ago
What is 309,099,990 in standard form
Bess [88]

Answer:

300,000,000 + 9,000,000 + 90,000 + 9,000 + 900 + 90.

Step-by-step explanation:

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