Answer:
The ratio of Dial it up is $1: 20 text messages
The ratio of Ring Ring is
$1: 25 text messages
Step-by-step explanation:
Dial it up=$5 for 100 text messages
Ring Ring=$8 for 200 text messages
What is the ratio of the number of text messages to the price in dollars offered by each company?
The ratio of Dial it up is
$5 : 100
=$5/100
=$1/20
The ratio of Dial it up is $1: 20 text messages
The ratio of Ring Ring is
$8:200 text messages
=$8/200
=$1:25
The ratio of Ring Ring is
$1: 25 text messages
Ring Ring has a cheaper text message plan compared to Dial it up
12% of 300 shirts is 36 shirts
Answer:
a: 1037 is the minimum sample size needed
b: 712 is the minimum sample size needed
Step-by-step explanation:
We need to use the formula for minimum sample size of a proportion when a sample proportion is known.
The level of confidence is 99%, which has a corresponding z-value of 2.575.
We know the desired error is 4%, or 0.04.
Part a: We have no prior estimate. See attached photo for calculation
Part b:
We know p-hat = 0.22. Therefore q-hat = 1 - 0.22 = 0.78
See the attached photo for the calculation of the minimum sample size