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3 years ago

Select all statements below that are True or False

Mathematics

1 answer:

Katyanochek1 [597]3 years ago

6 0

Answer:

i d k sorry

Step-by-step explanation:

i should try quizlet it helps me alot

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The average price of homes sold in the U.S. in the past year was $220,000. A random sample of 81 homes sold this year showed a s

Molodets [167]

Answer:

We conclude that there has been a significant decrease in the average price homes.

Step-by-step explanation:

We are given the following in the question:

Population mean, μ = $220,000

Sample mean, $\bar{x}$ = $210,000

Sample size, n = 81

Significance level, α = 0.051

Population standard deviation, σ = $36,000

First, we design the null and the alternate hypothesis

$H_{0}: \mu = 220000\text{ dollars}\\H_A: \mu < 210000\text{ dollars}$

We use One-tailed z test to perform this hypothesis.

Formula:

$z_{stat} = \displaystyle\frac{\bar{x} - \mu}{\frac{\sigma}{\sqrt{n}} }$

Putting all the values, we have

$z_{stat} = \displaystyle\frac{210000 - 220000}{\frac{36000}{\sqrt{81}} } = -2.5$

Calculating the p-value from the z-table, we have:

P-value = 0 .00621

Since,

P-value < Significance level

We reject the null hypothesis and accept the alternate hypothesis. Thus, there has been a significant decrease in the average price homes.

5 0

3 years ago

Use the order of operations to simplify + 8(2.5 – 0.5).

Monica [59]

$\dashrightarrow \tt8(2.5 – 0.5)$

$\\ \\$

$\dashrightarrow \tt8(3)$

$\\ \\$

$\dashrightarrow \tt8 \times 3$

$\\ \\$

$\dashrightarrow \tt24$

7 0

2 years ago

Read 2 more answers

Madumita is asked by her cousin to deliver a box containing 20 chocolates to her friend. Madumita is promised a reward of 10₨ fo

pogonyaev

Answer:

75Rs

Step-by-step explanation:

This can be solved by turning the information in the prompt into two equations, 20 = E + D, and (10 x D) - (15 x E) = M. For this, E represents the number of chocolates Madumita ate along the way, D represents the number of chocolates she successfully delivered, and M represents how much money she will receive from her cousin: what we are looking for. Since they give us the number she ate along the way (E), we can plug that in to the first equation to find D. ( 20 = 5 + D ----> 15 = D ) Now that we have E and D, we can plug them into the second equation to find M. (10 x 15) - (15 x 5) = M -----> 150 - 75 = 75Rs.

6 0

3 years ago

Can someone help me with this problem

Maksim231197 [3]

The area of a triangle is .5*b*h = .5x^2

.5x^2 = 27 so

x^2 = 54

x = sqrt(54) = 7.3

5 0

4 years ago

an arrow is shot vertically upward from a platform 33ft high at a rate of 174 ft/sec. when will the arrow hit the ground?

Cloud [144]

Answer:

h(t) = -16t2 + 186t + 43

at the ground h = 0

hence; -16t2 + 186t + 43 = 0

solving this quadratic equation using the quadratic formula ; a = -16, b = 186, c = 43 ; x = (-b +-(b2 - 4ac)1/2)/2a

gives t = 11.8 seconds to the nearest tenth (note that the negative root has no practical significance)

Step-by-step explanation:

3 0

3 years ago