Asked Oct 18, 2019
If upper overbar X=81​, Upper S=28​, and n=25​,and assuming that the population is normally​ distributed, construct a 90%confidence interval estimate of the population​ mean,μ.
[   ]≤ μ≤[  ]
​(Round to two decimal places as​ needed.)

Expert Answer

Step 1

From the provided information, populati...

sample mean (x) =81
standard deviation (s) 28
sample size (n)25
At 90% confidence interval the z is:
df n-1
df 24
a 1-0.90
a = 0.10
= 1.71

Image Transcriptionclose

sample mean (x) =81 standard deviation (s) 28 sample size (n)25 At 90% confidence interval the z is: df n-1 df 24 a 1-0.90 a = 0.10 0.05 = 1.71


Want to see the full answer?

See Solution

Check out a sample Q&A here.

Want to see this answer and more?

Solutions are written by subject experts who are available 24/7. Questions are typically answered within 1 hour.*

See Solution
*Response times may vary by subject and question.
Tagged in




Related Statistics Q&A

Find answers to questions asked by student like you

Show more Q&A add

Q: An independent-measures study with n= 6 in each sample produces a sample mean difference of 4 points...

A: It is given that the difference in sample means, (X1-bar – X2-bar) = 4Sample size is n1 = n2 = 6.The...


Q: The lifetime of a particular component is normally distributed with a mean of 1000 hours and a stand...

A: Given DataMean = 1000Standard deviation = 100probability that a randomly drawn component will last b...


Q: A newspaper article reports that the mean cost for preventative dental care per year is $175 with a ...

A: 1)Let µ denotes the mean cost for preventative dental care in your company is different from reporte...


Q: With a = .01, the two-tailed critical region for a t test using a sample of n = 16 subjects would ha...

A: It is given that the level of significance is 0.01.Sample size,  n = 16.The degrees of freedom is, n...


Q: Part D

A: It is given that A is the event that a consumer has seen the product advertised and B is the event t...


Q: The table below shows the results of a random sample of patients at a hospital classified by the mut...

A: a.The table by filling in the correct values in the total column and total row is obtained below:


Q: A sociologist randomly selects single adults for different groups of​ three, and the random variable...

A: The condition for the valid probability distribution is, the sum of the probabilities is equal to 1....


Q: A rare form of malignant tumor occurs in 11 children in a​ million, so its probability is 0.000011. ...

A: Thank you for posting the question. Since you have posted a question with more than 3 parts, we have...


Q: The owner of a fish market has an assistant who has determined that the weights of catfish are norma...

A: Given information: