How do I do 2/13×2/16
2 answers:
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Answer:
a. CI=[128.79,146.41]
b. CI=[122.81,152.39]
c. As the confidence level increases, the interval becomes wider.
Step-by-step explanation:
a. -Given the sample mean is 137.6 and the standard deviation is 20.60.
-The confidence intervals can be constructed using the formula;
where:
is the sample standard deviation
is the s value of the desired confidence interval
we then calculate our confidence interval as:
Hence, the 95% confidence interval is between 128.79 and 146.41
b. -Given the sample mean is 137.6 and the standard deviation is 20.60.
-The confidence intervals can be constructed using the formula in a above;
Hence, the variable's 99% confidence interval is between 122.81 and 152.39
c. -Increasing the confidence has an increasing effect on the margin of error.
-Since, the sample size is particularly small, a wider confidence interval is necessary to increase the margin of error.
-The 99% Confidence interval is the most appropriate to use in such a case.
Answer:
The expression for the total amount of tickets sales can be give in dollars as :
⇒
Step-by-step explanation:
Given:
Cost of a ticket in standing arena = $210
Cost of a ticket for a seat = $130
Total people that can accommodate in standing arena = 350
Total number of seats in the concert =
To write the expression for the total amount of tickets sales if the concert is sold out.
Solution:
The concert is sold out. This means 350 tickets for standing arena and tickets for seats are sol out.
Using unitary method to find the total cost.
If a ticket in front stage arena costs = $210
<em>Then, 350 such tickets will cost</em> =
If a ticket for a seat costs = $130
<em>Then, y such tickets will cost </em>=
Total amount of ticket sales can be given as:
⇒