a. Find a 90% confidence interval for the mean cost of a dinner in Baku. The investor plans to run a larger survey. Assuming that the true (population) 25, what is the minimum sample size such that we are able to estimate the true mean within a 5 margin of error, 95% of the time? b. standard deviation is known to be o =

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
icon
Related questions
Question
Help please
An investor is considering opening up a new restaurant in the city of Baku, but doesn't
know what type of restaurant is in demand. A study is run to learn about the spending
habits of people in Baku who go out for dinner. A random sample of 25 people were
selected, and asked the cost of the last time they went out for dinner. The results from
the survey had a sample mean of i = 65 manats and a sample standard deviation of s
= 25 manats. Assume the amount of money spent is normally distributed.
a.
Find a 90% confidence interval for the mean cost of a dinner in Baku.
b.The investor plans to run a larger survey. Assuming that the true (population)
standard deviation is known to be o = 25, what is the minimum sample size such that
we are able to estimate the true mean within a 5 margin of error, 95% of the time?
Transcribed Image Text:An investor is considering opening up a new restaurant in the city of Baku, but doesn't know what type of restaurant is in demand. A study is run to learn about the spending habits of people in Baku who go out for dinner. A random sample of 25 people were selected, and asked the cost of the last time they went out for dinner. The results from the survey had a sample mean of i = 65 manats and a sample standard deviation of s = 25 manats. Assume the amount of money spent is normally distributed. a. Find a 90% confidence interval for the mean cost of a dinner in Baku. b.The investor plans to run a larger survey. Assuming that the true (population) standard deviation is known to be o = 25, what is the minimum sample size such that we are able to estimate the true mean within a 5 margin of error, 95% of the time?
Expert Solution
steps

Step by step

Solved in 2 steps

Blurred answer
Knowledge Booster
Point Estimation, Limit Theorems, Approximations, and Bounds
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, probability and related others by exploring similar questions and additional content below.
Recommended textbooks for you
A First Course in Probability (10th Edition)
A First Course in Probability (10th Edition)
Probability
ISBN:
9780134753119
Author:
Sheldon Ross
Publisher:
PEARSON
A First Course in Probability
A First Course in Probability
Probability
ISBN:
9780321794772
Author:
Sheldon Ross
Publisher:
PEARSON