Answer:
See below
Step-by-step explanation:
<u>Check One Sample Z-Interval Conditions</u>
Simple Random Sample? √
np≥10? √
n(1-p)≥10? √
<u>One-Sample Z-Interval Information</u>
- Formula -->
- Sample Proportion -->
- Critical Value -->
(for a 85% confidence level) - Sample Size -->
- Margin of Error (MOE) -->
<u>Problem 1</u>
As stated previously, Anas should use the critical value to construct the 85% confidence interval
<u>Problem 2</u>
Given our formula for the margin of error (MOE), the value is 
<u>Problem 3</u>
The 85% confidence interval would be 
, which means that we are 85% confident that the true proportion of people that clicked on the advertisement is between 0.1786 (~45 people) and 0.2534 (~63 people)
<u>Problem 4</u>
Increasing the sample size to 
is going to decrease the margin of error because it is a closer representation of the population, but, alas, requires more time, energy, and resources to observe.
Answer:
Arsenic-74-is used to locate brain tumors. It has a half-life of 17.5 days. ... C. Find the amount remaining after 6 days from a 90-mg sample
Answer: 1/250
Step-by-step explanation:
Given the recurring decimal : 0.004
Firstly:
Let x = 0.004 - - - (1)
Due to the number of decimals places and value of x;
We multiply (1) by 1000 to obtain an integer
Multiply (1) by 1000
1000x = 4 - - - (2)
From (2) we can solve for x and leave our answer as a fraction.
Divide (2) by 1000 to obtain the value of x
1000x / 1000 = 4 / 1000
x = 1 / 250
Recall x = 0.004
Therefore, x = 0.004 = 1/250
