Answer:
Step-by-step explanation:
Hello!
You have two populations of interest and want to compare them. If you define the study variables as:
X₁: average hourly wages of an employee of the Downtown store.
n₁= 25
X[bar]₁= $9
S₁= $2
X₂: average hourly wages of an employee of the North Mall store.
n₂= 20
X[bar]₂= $8
S₂= $1
Both samples taken are independent, assuming that both populations are normal and that their population variances are equal I'll use the Student's-t statistic with a pooled sample variance to calculate the Confidence interval:
95% CI for μ₁ - μ₂
(X[bar]₁-X[bar]₂) ± 
Sa= 1.64
(9-8)±2.017*
[0.007636;1.9923]
I hope it helps!
Answer:
60x
Step-by-step explanation:
Answer:
<em><u>D</u></em><em><u>,</u></em><em><u> </u></em><em><u>122°F</u></em>
Step-by-step explanation:
°F = 9/5°C + 32
°F = 9/5(50) +32
°F = 90 + 32
°F = 122
Answer: 90% decrease
Step-by-step explanation: First determine whether the number is increasing or decreasing. Since it changes from 2,000 to 200, it's going down so it's decreasing.
Now to find the percent decrease, we divide the
amount of change by the original number.
The <em>amount of change</em> is the difference between the two numbers
which in this case is 2,000 - 200 and the original number is 2,000.
.
2,000 - 200 is 1,800.
So we're left with 1,800/2,000 and dividing
2,000 into 1,800 gives us 0.9.
Remember however that our problem is
asking for a <em>percent</em>, not a decimal.
So we need to write 0.9 as a percent and we can do
that by multiplying it by 100 and adding the percent sign.
So 0.9 becomes 90%.
So when a number changes from 2,000 to 200,
it has decreased by 90%.
Answer:
So,converting 150 mile per hour into miles per second we get 0.0416 miles per second
Step-by-step explanation:
Given:
Helicopter files at: 150 miles per hour
Required:
We need to convert 150 miles per hour to miles per second
Solution:
We know that, 
So, 150 mile per hour will be: (We will be dividing 150 by 3600 to get miles per second)
So,converting 150 mile per hour into miles per second we get 0.0416 miles per second
