Question

If X =65, standard deviation = 7 and n = 63 construct a 99% confidence interval estimate for the population mean.

Also, would anyone know how to do this in Excel?

Answer #1

Using Excel,

Here population standard deviation is not given so we use t .

Press Ok

A 99% confidence interval estimate for the population mean is,

**(62.656 , 67.344)**

**(62.66 , 67.34) ................(Rounded to 2 decimal
)**

Using Z

One sample Z summary confidence interval:

μ : Mean of population

Standard deviation = 7

**99% confidence interval results:**

Mean | n | Sample Mean | Std. Err. | L. Limit | U. Limit |
---|---|---|---|---|---|

μ | 63 | 65 | 0.8819171 | 62.728332 | 67.271668 |

**(62.73 , 67.27)**

If
X = 135, o = 26, and n= 38, construct a 99% confidence interval
estimate of the population mean, p (Round to two decimal places as
needed.)

Construct a? 99% confidence interval to estimate the population
mean using the data below. x?=25 , s=4.5 , n=22 , N=180. The 99%
confidence interval for the population mean is? (Round to two
decimal places)

Construct a 99% confidence interval to estimate the population
mean using the data below.
x over bar equals 25
s equals 3.5
n equals 23
N equals 180
The 99% confidence interval for the population mean is
(____,____)

Construct a 99% confidence interval to estimate the population
mean using the data below.
x overbarx=15
s=5.6
n=12
What assumptions need to be made about this population?
The 99% confidence interval for the population mean is from a
lower limit of ____ to an upper limit of ____

Construct a 98% confidence interval to estimate the population
mean with x=63 and σ equals =12 for the following sample sizes.
a) 30
b) 44
c) 64

Use the standard normal distribution or the t-distribution to
construct a 99% confidence interval for the population mean.
Justify your decision. If neither distribution can be used,
explain why. Interpret the results. In a random sample of 13
mortgage institutions, the mean interest rate was 3.59% and the
standard deviation was 0.42%. Assume the interest rates are
normally distributed.
Select the correct choice below and, if necessary, fill in any
answer boxes to complete your choice.
A. The 99% confidence...

Use the given degree of confidence and sample data to construct
a confidence interval for the population mean. Assume that the
population has a normal distribution n=96 x=87.1 standard
deviation=6.2; 99% confidence

Use the standard normal distribution or the t-distribution to
construct a 99% confidence interval for the population mean.
Justify your decision. If neither distribution can be used,
explain why. Interpret the results.
In a recent season, the population standard deviation of the
yards per carry for all running backs was 1.21. The yards per carry
of 25 randomly selected running backs are shown below. Assume the
yards per carry are normally distributed.
1.6 3.4 2.8 6.9 6.1 5.8 7.3 6.5...

Construct the 99% confidence interval estimate of the population
proportion p if the sample size is n=700 and the number of
successes in the sample is x=251.
____<p<____

Construct an 80% confidence interval for the population standard
deviation if a sample of size 7 has standard deviation s=10.5.
Round the answers to at least two decimal places.

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 7 minutes ago

asked 34 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 2 hours ago

asked 2 hours ago

asked 2 hours ago

asked 2 hours ago

asked 2 hours ago

asked 3 hours ago