Question

In a survey, 25 people were asked how much they spent on their
child's last birthday gift. The results were roughly bell-shaped
with a mean of $34 and standard deviation of $2. Construct a
confidence interval at a 95% confidence level.

Give your answers to one decimal place.

±±

Interpret your confidence interval in the context of this
problem.

Answer #1

df = n - 1 = 25 - 1 = 24

t critical value at 0.05 significance level with 24 df = 2.064

95% confidence interval for is

t * S / sqrt(n)

34 2.064 * 2 / sqrt(25)

**34 0.8**

The interval is 34-0.8 to 34+0.8

33.2 to 34.8

That is 95% CI is **( 33.2 , 34.8 )**

Interpretation- We are 95% confident that true mean is between $33.2 and $34.8

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 $42 and standard deviation of $7. Construct a
confidence interval at a 90% confidence level.
Give your answers to one decimal place and Interpret your
confidence interval in the context of this problem.

In a survey, 25 people were asked how much they spent on their
child's last birthday gift. The results were roughly bell-shaped
with a mean of $45 and standard deviation of $9. Construct a
confidence interval at a 80% confidence level. Give your answers to
one decimal place.

n a survey, 13 people were asked how much they spent on their
child's last birthday gift. The results were roughly bell-shaped
with a mean of $42 and standard deviation of $4. Construct a
confidence interval at a 98% confidence level.
Give your answers to one decimal place.
Correct ±± Incorrect
Interpret your confidence interval in the context of this
problem.
please do it step by step
thanks

n a survey, 13 people were asked how much they spent on their
child's last birthday gift. The results were roughly bell-shaped
with a mean of $42 and standard deviation of $4. Construct a
confidence interval at a 98% confidence level.
Give your answers to one decimal place.
Correct ±± Incorrect
Interpret your confidence interval in the context of this
problem.
please do it step by step thanks

In a survey, 21 people were asked how much they spent on their
child's last birthday gift. The results were roughly bell-shaped
with a mean of $31 and standard deviation of $12. Construct a
confidence interval at a 95% confidence level. Give your answers to
one decimal place.

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child's last birthday gift. The results were roughly bell-shaped
with a mean of $45 and standard deviation of $3. Construct a
confidence interval at a 95% confidence level.
Give your answers to one decimal place.
___+-____

In a survey, 17 people were asked how much they spent on their
child's last birthday gift. The results were roughly bell-shaped
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Give your answers to one decimal place.
< μμ <

In a survey, 30 people were asked how much they spent on their
child's last birthday gift. The results were roughly bell-shaped
with a mean of $39 and standard deviation of $10. Construct a
confidence interval at a 80% confidence level.
Give your answers to one decimal place.

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 $44 and standard deviation of $14. Construct a
confidence interval at a 99% confidence level.
Give your answers to one decimal place.

In a survey, 17 people were asked how much they spent on their
child's last birthday gift. The results were roughly bell-shaped
with a mean of $40 and standard deviation of $10. Construct a
confidence interval at a 80% confidence level.
Give your answers to one decimal place.
____+-_____

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