Estimation

Please see the attached file for full problem description.

Estimation

Please see the attached file for full problem description.

Estimation: What is the level of confidence provided by this interval?

A random check of 81 records of inmates from all federal prisons found the confidence interval for mean prison terms per prisoner to be 2.113 years to 2.287 years. Assuming a standard deviation of 0.4 year, what is the level of confidence provided by this interval?

Estimation: Sample size. How many voters should be sampled if the party wants to estimate the population proportion with a sampling error of 5% or less?

In an election campaign, the party vying for an upset polls a sample of 100 voters. The party finds that 60 of 100 clearly express the intention of voting in favour of the party polling. How many voters should be sampled if the party wants to estimate the population proportion with a sampling error of 5% or less? (Use confidence level of 95%)

Estimation

Question: Hockey-r-us" a store specializing in sales of hockey equipment, wants to find out the average age of all it's customers. A random sample 25 customers reveals an average age of 38 years, with a standard deviation of six years. Determine a 95% confidence interval of the average age of all customers. Answer: In order for me answer this problem I will first have to calculate the standard error the mean, knowing that: N (the number of subjects)= 25 the mean=38 σ (standard deviation) = 6. The formula for the standard error of the mean is: σ /√N The standard error of the mean is: 6/√25 = 1.2 I have to compute the margin of error by multipl... click for more