Answer:
The minimum sample needed to provide a margin of error of 3 or less is 52.
Step-by-step explanation:
The confidence interval for population mean (<em>μ</em>) is:
The margin of error is:
<u>Given:</u>
MOE = 3
<em>σ </em>= 11
The critical value for 95% confidence interval is:
**Use the <em>z</em>-table for critical values.
Compute the sample size (<em>n</em>) as follows:
Thus, the minimum sample needed to provide a margin of error of 3 or less is 52.
Answer:
Step-by-step explanation:
GIVEN: A bicycle training wheel has a radius of . The bicycle wheel has a radius of
.
TO FIND: Approximately how much smaller, in square inches, is the area of the training wheel than the area of the regular wheel.
SOLUTION:
radius of bicycle wheel
area of bicycle wheel
putting value,
area of bicycle wheel
radius of bicycle training wheel
area of bicycle training wheel
putting value,
area of bicycle wheel
difference in area of bicycle wheel and bicycle training wheel
hence the training wheel is smaller than regular wheel