Answer:
The sample size is used for the survey (n) = 1082
<u>Step-by-step explanation</u>:
<u>Explanation</u>:-
<u>Step(i)</u>:-
Given data There has been a trend toward less driving in the last few years, especially by young people. From 2001 to 2009
Assume the standard deviation was 2000 miles in 2009
Given the Population standard deviation 'σ' = 2000 miles
Given the margin of error at 90% of confidence interval
Margin of error = 100 miles
The z- score value at 90% of confidence interval = 1.645
<u>Step(ii):-</u>
The Margin of error is determined by
Now the sample size
√n = 32.9
squaring on both sides , we get ' n ' = 1082.41
<u>Final answer:-</u>
The sample size is used for the survey (n) = 1082
Answer:
$300
Step-by-step explanation:
In this question, we are simply asked to calculate the simple interest on $3000, at a rate of 20% paid after 6 months.
We can do this as follows. Mathematically, it should be remembered that:
S.I = PRT/100
In this case, we lost out the individual values as follows:
P = $3000, R = 20% and T = 6 months = 0.5years, S.I = ?
We substitute the parameters into the equation:
S.I = (3000 * 20 * 0.5)/100 = $300
Answer:
1080°
Step-by-step explanation:
sum = 180 ( n - 2)
note that octagon has 8 sides
therefore
sum = 180 ( 8 - 2)
sum = 1080°
The answer to that is: X = 8.
40 divided by 5 = 8.
To check we can do 5 x 8 = 40.
X = 8
Answer: C . and
Step-by-step explanation:
Definition:
Null hypothesis is a statement about the population parameter according to the objective raised by the researcher . It contains '=' , '≤' and '≥' signs.
Alternative hypothesis is also a statement about the population parameter but against null hypothesis . It contains '≠' , '<' and '>' signs.
Let be the average customer waiting time for the population.
Given : The average customer waiting time at a fast food restaurant has been 7.5 minutes.
Objective of test : After using new system , the average customer waiting time is at least 7.5 or less than 7.5.
Then, the null and alternative hypothesis for this scenario will be :