Determining confidence interval for population variance

Assignment Help Basic Statistics

Reference no: EM1323018

Q1) Investment banker would like to evaluate percentage of new clients who will make certain type of investment. If she wishes a sampling error of new greater than 2.5% and confidence level of 90%, how many clients must she sample? What sample size is needed for 85% confidence level?

Q2) A manufacturer bonds plastic coating in metal surface. Random sample of nine observations n the thickness of this coating is taken from a week's output, and thickness in millimetres are as follows:

19.8 21.2 18.6 20.4 21.6 19.8 19.9 20.3 20.8

Suppose normality, determine a 90% confidence interval for population variance.

Q3) Large population of overdue bills has balances which follow a normal curve .When we take a sample of 100 of these average $500 and the SD is$100.

What statement can you make about range $300 to $700

What statement can you make about range $480 to $520

Reference no: EM1323018

Questions Cloud

Age distribution of patients : Office Visits what is the age distribution of patients who make office visits to a doctor or nurse?

Projecting a good company image : Give specific examples of how each of these reports establishes a good relationship with the audience. Consider such components as taking the "you" attitude, emphasizing the positive, establishing credibility

Four industry concentration ratios for corn growers : Guess as to illustrate what might be the four industry concentration ratios for corn growers in the United States

Monitoring office visits on the schedule : This morning the office you are monitoring has eight office visits on the schedule. What is the probability that

Determining confidence interval for population variance : Suppose normality, determine a 90% confidence interval for population variance.

Define the equilibrium of a market : Define the equilibrium of a market. Describe the forces which move a marketplace toward its equilibrium.

Educating about computer viruses and malware : The University of Calgary provides a senior-level computer science course known as, “Computer Viruses and Malware.” The course taught the students how to write the viruses, worms, and Trojan Horses. It also describes the history of the computer vi..

Fiscal policies might activist keynesian economists : Which fiscal policies might activist Keynesian economists recommend helping a depressed economy regain full employment

Probability of monitoring the patients : This morning the office you are monitoring has eight office visits on the schedule. What is the probability that:

User Account

All Pages