Answer:
A sample size of 385 is needed.
Step-by-step explanation:
We have that to find our 
level, that is the subtraction of 1 by the confidence interval divided by 2. So:
Now, we have to find z in the Ztable as such z has a pvalue of 
.
That is z with a pvalue of 
, so Z = 1.96.
Now, find the margin of error M as such
In which 
is the standard deviation of the population and n is the size of the sample.
You feel that a reasonable estimate of the standard deviation is 10.0 hours.
This means that 
What sample size is needed so that the expected margin of error of your estimate is not larger than one hour for 95% confidence?
A sample size of n is needed. n is found when M = 1. So
Rounding up:
A sample size of 385 is needed.
Answer:
12 roses
Step-by-step explanation:
$52 to spend at the florist
a vase for $11.75
roses for $3.50 each
Calculating how much left after buying the vase:
$52 - $11.75 = $40.25
To Know the possible numbers of roses Erin can buy, divide:
$40.25 ÷$3.50 = 11,75, roundind 12 roses
Answer:
72
Step-by-step explanation:
44- -28
First week he get pays 19 and hour
19 multiply by 33 hours that he work on the second week is what he get pays ($627.00)
Answers is 33 hours
