User Account

All Pages

Confidence interval on the estimated sample mean

Assignment Help Basic Statistics
Reference no: EM131173671

Suppose you have a random sample from a normal distribution. Using this sample, you've estimated the sample mean to be 7.5. Your sample size is 25, and you've estimated the sample standard deviation to be 3.

a) Calculate the 90% confidence interval on the estimated sample mean.

b) Calculate the 99% confidence interval. Why is this interval larger?

c) Explain why this confidence interval would shrink if your sample size was 100 (there  are two reasons).

Reference no: EM131173671

Questions Cloud

Realize the greatest increase in profits when sales increase : Company A's expenses are mostly variable while Company B's expenses are mostly fixed, which company will be most likely to realize the greatest increase in profits when sales increase?
What factors should he consider before making the election : The insurer has requested that he select a settlement option for payment of the proceeds. - What factors should he consider before making the election?
Suburban town are allergic to ragweed : It has been found that 10% of the people in a suburban town are allergic to ragweed.If 5 people of the town are selected at random, what is the probability that
Review the audit report issued by the external auditing firm : Review the audit report issued by the external auditing firm from the company's Website for year it was accused of fraud. Then, determine whether the external auditors were negligent in preparing the audit report for the company.
Confidence interval on the estimated sample mean : a) Calculate the 90% confidence interval on the estimated sample mean. b) Calculate the 99% confidence interval. Why is this interval larger? c) Explain why this confidence interval would shrink if your sample size was 100 (there  are two reasons).
Determine the expected life of this segment of shaft : The internal diameter of the pressure vessel is 300 mm and the pressure in the vessel varies from 0 to P kPa gauge. Assuming that the bolts are initially tightened to 80% of their yield strength determine the maximum value of P that would not caus..
Calculate the uncertainty in the measurement in this length : Calculate the frequency that the instrument will indicate when L = 10 cm ± 0.5 mm. Also, calculate the uncertainty in the measurement in this length.
Accumulated depreciation should be recorded at : In the financial records of the partnership,  - this equipment and its accumulated depreciation should be recorded at--
Was there a control or comparison group : 1. Is this an experiment or an observational study? Justify your answer. 2. Was there a control or comparison group in this study? If so, describe how this is implemented. If not, briefly discuss a potential problem due to lack of a control or com..

Reviews

Write a Review

Basic Statistics Questions & Answers

  Preventable health care-related errors cost

The Agency for Healthcare Research and Quality reports that medical errors are responsible for injury in 1 out of every 25 hospital patients in the United States. These errors are tragic and expensive. Preventable health care-related errors cost t..

  Determine the probability of the sample average number

What should the average weight be if the production manager wants no more than 5% of the products to weigh more than 10 ounces and determine the probability of the sample average number of strokes being more than 5.0.

  Variables-scatterplot and correlations

The owner of Maumee Ford-Mercury wants to study the relationship between the age of a car and its selling price. Listed below is a random sample of 12 used cars sold at the dealership during the last year.

  Rejecting the officials claim

A state transportation official claims that the mean waiting time at exit booths from a toll road near the capitol is no more than .40 minutes. for a sample of 35 motorists exiting the toll road, it was found that the mean waiting time was .46 min..

  Calculate the test statistic for the goodness of fit

In an experiment in which a die was rolled 188 times it was counted up how many times each face came up. The results are as follows:

  Assuming all test scores are different you would like to

assuming all test scores are different you would like to determine the relative test scores of three classmates using

  Length of a randomly selected call

The length of a particular telemarketing phone call has an exponential distribution with a mean equal to 1.5 minutes. Find the probability that the length of a randomly selected call will be between 30 - 50 minutes and 1 minuter or longer.

  When the gear is being produced the shop can make 80 gears

franks machine shop operates 250 days per year. frank sells 5000 units per year of his most popular item a specialty

  Possible statistics for estimating

Consider the following population: {2, 3, 3, 4, 4}. The value of m is 3.2, but suppose that this is not known to an investigator, who therefore wants to estimate m from sample data. Three possible statistics for estimating m are

  Compute total expected number of tests necessary

Assume the probability that a person has the desease is 0.03 for all people, independently of each other. Compute the total expected number of tests necessary.

  According to the coffee research organization the typical

according to the coffee research organization the typical american coffee drinker consumes an average of 3.1 cups per

  Create a mock spss data set

Create a mock SPSS data set. Create a data file in SPSS and enter the data presented in the table located in section 3.5 of chapter 3 in your textbook. Save this SPSS data file

Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

Submit Assignment

Academics

Major Subjects

Majors

Get In Touch

whatsapp: +1-415-670-9521

Phone: +1-415-670-9521

Email: [email protected]

TERMS & POLICIES

HELP & SUPPORT

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd