Answer:
or
Step-by-step explanation:
If Alexa worked 30 hours last week and earned $450, then her hourly payment is
Her payment has now been increased by 20%, so her hourly payment becomes
If she worked h hours, then she earned If her new payment is p, then
or
Answer:
The sample size is
Step-by-step explanation:
From the question we are told that
The rough estimate of the standard deviation is
The interval width is
Generally the margin of error is mathematically represented as
=>
=>
From the question we are told the confidence level is 99% , hence the level of significance is
=>
Generally from the normal distribution table the critical value of is
Generally the sample size is mathematically represented as
=>
=>