MATHEMATICS HIGH SCHOOL

A real estate agent is working for a developer who claims that the average commute time to downtown is 20 minutes with a standard deviation of 7 minutes. Stephon is an independent real estate agent and wants to check the times for his client. He took a random sample of 15 commute times and found an average of 26 minutes. He did hypothesis testing using a significance level of 5%. Which conclusion could he make?

Answers

Answer 1
Answer:

To calculate the z-statistic, we must first calculate the standard error.

Standard error is standard deviation divided by the square root of the population. In this case, it is equal to 1.81.

The z-score is defined the distance from the sample to the population mean in units of standard error.

z = (26 – 20)/1.81 = 3.31

at this z-score = 0.0005 which is less than 5%

 
Answer 2
Answer:

the answer is C. the z- statistic is 3.32, so the null hypothesis should be rejected.

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The digit in the tens place is twice as big as the digit in the tens place in 182,437. A) True B) False

Answers

B) False

In the number 182,437, the digit in the tens place is 3, and the digit in the tens place is 4. The digit in the tens place (3) is not twice as big as the digit in the tens place (4).

An estimated 3 out of every 25 men are left-handed. What percent of men are left-handed?

Answers

3/25=x/100
25x=300
300/25=x
x=12%

Answer:

12%

Step-by-step explanation:

a sweater was on sale for 40% off the regular price.Ella saved $20 by buying the sweater on sale. What was the regular price of the sweater?

Answers

The sweater has a discount with is 40% of the regular price.
She saved 20 dollars on  the sweater that she bought.
Let's solve for the original price of the sweater then,
=> 20 dollars = 40%.
Let's look for the 60%.
=> 20 / 4 = 5 dollars is the 10% of the sweater's original price.
=> 5 dollars * 10 = 50 dollars
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Find the positive sqaure roots up to 3 decimals
i) 1+(0.046)2​

Answers

Step-by-step explanation:

1+0.092= 1.0922) 1+0.042= 1.042

Answer:

1+0.092= 1.0922) 1+0.042= 1.042

Step-by-step explanation:

it is the explanation 1+0.092= 1.0922) 1+0.042= 1.042

What is the range of the function on the graph?O all real numbers
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Answers

Answer:

4th Option: All real numbers greater than or equal to 2.

Step-by-step explanation:

Range is the set of y-values that can be outputted by function f(x).

We see here our range spans from 2 to infinity. Since 2 is a closed dot, we can include it in our range. Therefore our answer is All real numbers that are greater than or equal to 2.

[2, ∞)

Answer:all real numbers greater than or Equal to 2

Step-by-step explanation:

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Answers

Answer:

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