Question

Inference fro one mean: In a survey, 18 people were asked how much they spent on...

Inference fro one mean:

In a survey, 18 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $38 and standard deviation of $4. Find the margin of error at a 95% confidence level.

Give your answer to two decimal places.

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

Homework Answers

Answer #1

Solution :  

Given that,

= 38

= 4

n = 18

At 95% confidence level the z is ,

  = 1 - 95% = 1 - 0.95 = 0.05

/ 2 = 0.05 / 2 = 0.025

Z/2 = Z0.025 = 1.960

Margin of error = E = Z/2* (/n)

= 1.960 * (4/ 18 )

= 1.85

Margin of error = = 1.85

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
In a survey, 20 people were asked how much they spent on their child's last birthday...
In a survey, 20 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $38 and standard deviation of $3. Find the margin of error at a 98% confidence level. Give your answer to two decimal places.
In a survey, 31 people were asked how much they spent on their child's last birthday...
In a survey, 31 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $47 and standard deviation of $3. Find the margin of error at a 95% confidence level. Give your answer to two decimal places.
In a survey, 18 people were asked how much they spent on their child's last birthday...
In a survey, 18 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $48.8 and standard deviation of $19.5. Construct a confidence interval at a 98% confidence level. Express your answer in the format of ¯x ± Error. $ ± $
In a survey, 19 people were asked how much they spent on their child's last birthday...
In a survey, 19 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $32 and standard deviation of $4. Find the margin of error at a 98% confidence level.
In a survey, 101 people were asked how much they spent on their child's last birthday...
In a survey, 101 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $37 and standard deviation of $10. Find the margin of error for a 80% confidence level.
In a survey, 101 people were asked how much they spent on their child's last birthday...
In a survey, 101 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $36 and standard deviation of $6. Find the margin of error for a 99% confidence level.
In a survey, 26 people were asked how much they spent on their child's last birthday...
In a survey, 26 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $41 and standard deviation of $2. Find the margin of error at a 80% confidence level.
In a survey, 23 people were asked how much they spent on their child's last birthday...
In a survey, 23 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $49 and standard deviation of $8. Find the margin of error at a 98% confidence level.
In a survey, 11 people were asked how much they spent on their child's last birthday...
In a survey, 11 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $46 and standard deviation of $2. Find the margin of error at a 98% confidence level. Give your answer to two decimal places.
In a survey, 16 people were asked how much they spent on their child's last birthday...
In a survey, 16 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $46 and standard deviation of $6. Estimate how much a typical parent would spend on their child's birthday gift (use a 90% confidence level). Give your answers to one decimal place. Provide the point estimate and margin or error. ±±
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT