Question

you are the proprietor of a NYC boutique. you want to know the average age of...

you are the proprietor of a NYC boutique. you want to know the average age of your customers. you take a random sample of 12 customer which yields an average age of 32 with a standard deviation of 8.
determine a 95% conference interval for age of your customers

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

Homework Answers

Answer #1

t critical value at 0.015 level with 11 df = 2.201

95% confidence interval for is

- t * S / sqrt(n) < < + t * S / sqrt(n)

32 - 2.201 * 8 / sqrt(12) < < 32 + 2.201 * 8 / sqrt(12)

26.917 < < 37.083

95% CI is ( 26.917 , 370.083)

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 proprieter of a boutique in New York wanted to determine the average age of his...
The proprieter of a boutique in New York wanted to determine the average age of his customers. A random sample of 25 customers revealed an average of 28 years with a standard deviation of 10 years. Determine a 95% confidence interval estimate for the average age of all his customers.
You own a small storefront retail business and are interested in determining the average amount of...
You own a small storefront retail business and are interested in determining the average amount of money a typical customer spends per visit to your store. You take a random sample over the course of a month for 24 customers and find that the average dollar amount spent per transaction per customer is $80.117 with a standard deviation of $13.8918. When creating a 95% confidence interval for the true average dollar amount spend per customer, what is the margin of...
The makers of a soft drink want to identify the average age of its consumers. A...
The makers of a soft drink want to identify the average age of its consumers. A sample of 16 consumers is taken. The average age in the sample was 22.5 years with a standard deviation of 5 years. Assume the population of consumer ages is normally distributed. a.Construct a 95% confidence interval for the average age of all the consumers. b.Construct an 80% confidence interval for the average age of all the consumers. c.Discuss why the 95% and 80% confidence...
Suppose you want to know if the average age of CEO’s at fortune 500 companies has...
Suppose you want to know if the average age of CEO’s at fortune 500 companies has increased in recent years. In 2010 you took a sample of 30 CEO’s and find their average age is 47 with a sample variance of s 2 2 = 36. In 2016 you took a sample of 25 CEO’s and find their average age is 50 with a sample variance of S 1 2 = 25. Assume the degrees of freedom is 42 What...
A sporting goods store believes the average age of its customers is 38 or less. A...
A sporting goods store believes the average age of its customers is 38 or less. A random sample of 45 customers was​ surveyed, and the average customer age was found to be 42.1 years. Assume the standard deviation for customer age is 9.0 years. Using alpha equals 0.01​, determine the p value for this test.
A survey of CPAs across the United States found the average net income for sole proprietor...
A survey of CPAs across the United States found the average net income for sole proprietor CPAs is $114,300. Because this survey is now more than 5 years old, an accounting researcher wants to test this figure by taking a random sample of 36 sole proprietor accountants in the United States to determine whether the average net income has increased. Only 500 sole proprietorships practice in the US. The sample of 36 sole proprietor accountants had a mean of $119,000...
Suppose you want to know the average amount of sleep you get per night. You record...
Suppose you want to know the average amount of sleep you get per night. You record your elapsed sleep time over 35 nights. The mean is 7.1 and standard deviation is 2.3. Find a 95% confidence interval for your mean number of hours of sleep per night. Report the answer accurate to four decimal places < μμ <
Suppose you want to know the average amount of sleep you get per night. You record...
Suppose you want to know the average amount of sleep you get per night. You record your elapsed sleep time over 74 nights. The mean is 7.9 and standard deviation is 2.2. Find a 95% confidence interval for your mean number of hours of sleep per night. Report the answer accurate to four decimal places
QUESTION 3: As an avid golfer, you want to estimate your average score for 18 holes...
QUESTION 3: As an avid golfer, you want to estimate your average score for 18 holes of golf. Suppose you know that the standard deviation of your score is 18.337 strokes and you want to find a sample mean that is within 5.982 strokes of your true average for all rounds of golf with 99% confidence. How many rounds would you need to play to determine this? QUESTION 4: In a climate survey, it was determined that in a random...
The folks at Purple Passion Perfume (P3) want to estimate the unknown average age u, of...
The folks at Purple Passion Perfume (P3) want to estimate the unknown average age u, of all P3 customers. A random sample of n = \27 P3 customers had mean age i = 28.7 with st dev s = 1.48. i) Find a95% Confidence Interval (CD for p ii) Interpret your interval. iii) Is p in this CI? Why or why not? Explain.
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT