Exam 4: Sampling and Estimation

If the difference between the means of paired samples is found to be zero,this would mean that ________.

The basic difference between a point estimate and a confidence interval is ________.

A major consumer products company wants to measure the quality of the packaging of their products on the store shelves.In a chain grocery store,all of the packages of a 15-ounce Wild Berry shampoo and all of the packages of a 4-ounce Man-O-Manly deodorant are sampled.What sampling method is being used for this sampling plan?

Find the 95% confidence interval for the population mean when a sample size of 40 gives a sample mean of 11 and a sample standard deviation of 0.88.Round off the answer to four significant digits.

Find the 90% confidence interval for the population proportion with a sample proportion of 0.45 from sample size 100 taken from a finite population of 500.State the answer to four significant digits.

A finite population correction factor should be used to adjust the margin of error when the sample taken is larger than ________ of the entire population.

Are the values found in a random number table or those generated by a random number generator truly random? Why or why not?

The central limit theorem states that no matter what the underlying population,the distribution of the sample means is ________.

The finite population correction (FPC)factor is used to improve the standard error by ________.

Systematic sampling ________.

As the level of confidence decreases,________.

Which of the following errors can be made while attempting to obtain statistics that measure population parameters?

Find the standard error of the mean for the fill weights of a dozen bottles of 15-ounce shampoo.The filling process has a standard deviation of 0.25 ounces.

Given that a sample of size 12 and population standard deviation of 1.8,what would be the margin of error at a 95% level of confidence?

Occasionally,a confidence interval for population variability may be desired.In this case,the confidence interval could be found for the ________.

The standard error of the mean is ________.

Peak Previously Played Picks buys and sells used sports equipment.For the past year,the mean purchase of used sports equipment was $36 with a standard deviation of $8.Using the Microsoft Excel function NORM.DIST,find the probability that the next person who comes in to sell used equipment will be paid less than $20.

Stratified random sampling is useful for populations that are divided into natural subsets.

Confidence intervals are useful in statistics because they provide more information than a point estimate.

Confidence interval estimates of a population parameter ________.