Question

Sofi is from Mexico and is looking at flights. She wants to estimate the average cost...

Sofi is from Mexico and is looking at flights. She wants to estimate the average cost of a flight to Quer´etaro (where she’s from) with a 95% confidence interval, with a margin of error of $26. She assumes that the standard deviation of flight costs is $45. How many flights should she look at in order to construct the confidence interval?

a. 12 b. 11 c. 299 d. 300

Math   Statistics-And-Probability   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

The deatiled solution is attached in the following image:

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
The manager of a pizza chain in Albuquerque, New Mexico, wants to determine the average size...
The manager of a pizza chain in Albuquerque, New Mexico, wants to determine the average size of their advertised 20-inch pizzas. She takes a random sample of 28 pizzas and records their mean and standard deviation as 20.20 inches and 1.40 inches, respectively. She subsequently computes the 95% confidence interval of the mean size of all pizzas as [19.68, 20.72]. However, she finds this interval to be too broad to implement quality control and decides to reestimate the mean based...
Nancy is a waitress at Seventh Heaven Hamburgers. She wants to estimate the average amount each...
Nancy is a waitress at Seventh Heaven Hamburgers. She wants to estimate the average amount each table leaves for a tip. A random sample of 5 groups was taken and the amount they left for a tip (in dollars) is listed below: $12.00 $8.00 $6.00 $4.00 $5.00 a.) Find a 90% confidence interval for the average amount left by all groups. (*round to the nearest cent*) $$ < μμ < $$ b.) If the sample size were larger, with everything...
A coal company wants to determine a 95% confidence interval estimate for the average daily tonnage...
A coal company wants to determine a 95% confidence interval estimate for the average daily tonnage of coal that they mine. Assuming that the company reports that the standard deviation of daily output is 200 tons, how many days should they sample so that the margin of error will be 39.2 tons or less?   
A publisher wants to estimate the mean length of time​ (in minutes) all adults spend reading...
A publisher wants to estimate the mean length of time​ (in minutes) all adults spend reading newspapers. To determine this​ estimate, the publisher takes a random sample of 15 people and obtains the results below. From past​ studies, the publisher assumes sigma is 2.3 minutes and that the population of times is normally distributed. 10   11   7   12   11   9   6   6   9   7   8   10   6   6   8 construct the 90% and 99% confidence interval for the population mean....
The marketing director of a large department store wants to estimate the average number of customers...
The marketing director of a large department store wants to estimate the average number of customers who enter the store every five minutes. She randomly selects five-minute intervals and counts the number of arrivals at the store. She obtains the figures 56, 32, 41, 49, 56, 80, 42, 29, 32, and 70. The analyst assumes the number of arrivals is normally distributed. Using these data, the analyst computes a 95% confidence interval to estimate the mean value for all five-minute...
The marketing director of a large department store wants to estimate the average number of customers...
The marketing director of a large department store wants to estimate the average number of customers who enter the store every five minutes. She randomly selects five-minute intervals and counts the number of arrivals at the store. She obtains the figures 57, 32, 41, 48, 56, 80, 42, 29, 32, and 74. The analyst assumes the number of arrivals is normally distributed. Using these data, the analyst computes a 95% confidence interval to estimate the mean value for all five-minute...
The marketing director of a large department store wants to estimate the average number of customers...
The marketing director of a large department store wants to estimate the average number of customers who enter the store every five minutes. She randomly selects five-minute intervals and counts the number of arrivals at the store. She obtains the figures 57, 32, 41, 46, 56, 80, 39, 29, 32, and 75. The analyst assumes the number of arrivals is normally distributed. Using these data, the analyst computes a 95% confidence interval to estimate the mean value for all five-minute...
the marketing director of a large department store wants to estimate the average number of customers...
the marketing director of a large department store wants to estimate the average number of customers who enter the store every five minutes . she randomly selects five-minute intervals and counts the number of arrivals at the store. she obtains the figures 51, 32, 41, 42, 56, 80, 48, 29, 32, and 69. The analyst assumes the number of arrivals is normally distributed. Using these data, the analyst computed a 95% confidence interval to estimate the mean value for all...
A marketing firm wants to estimate how much root beer the average teenager drinks per year....
A marketing firm wants to estimate how much root beer the average teenager drinks per year. A previous study found a standard deviation of 1.28 liters. How many teenagers must the firm interview in order to have a margin of error of at most 0.2 liter when constructing a 99% confidence interval?
A marketing firm wants to estimate how much root beer the average teenager drinks per year....
A marketing firm wants to estimate how much root beer the average teenager drinks per year. A previous study found a standard deviation of 1.07 liters. How many teenagers must the firm interview in order to have a margin of error of at most 0.4 liter when constructing a 99% confidence interval?
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT