Population and Sample Size

This sample consists of the entire population

• convenience

• census

• cluster

• simple

Every possible group of units of the required size has the same chance of being the selected sample as any other sample of the same size.

• Simple Random 

• Thoughtful

• Typical

• Proportional

Which conditions hold true based on the central limit theorem? (Check all that apply.)

• If samples of size n = 30 are drawn from a population, then the sampling distribution of sample means approximate a normal distribution

• If samples of size n < 30 are drawn from a population, then the sampling distribution of sample means approximate a normal distribution

• If samples of size n > 30 are drawn from a population, then the sampling distribution of sample means approximate a normal distribution

• If samples of size n < 30 are drawn from a population which is normally distributed, then the sampling distribution of sample means is also normally distributed

Consider a population which is normally distributed. If σ²=9 and n=16, what is the variance of the sampling distribution of sample means? (Do not round off)

What is the entire group of individuals or instances studied called?

• sample

• population

• class

• experiment

_______ is the entire group of objects or individuals considered for a survey.

• Sample

• Population

• Random Sample

• Quartile

What is the entire group studied called?

• sample

• population

• class

• experiment

A survey is carried out at Penn State Altoona to estimate the proportion of all undergraduate students living at home during the current term. Of the 3,838 undergraduate students enrolled at the campus, a random sample of 100 was surveyed. What is the population of the study?

• All the 3,838 undergraduate students enrolled at the campus

• The 100 who were surveyed

• All the students in universities across America

• All students living at home in the current term.

Population or Sample? A quality control engineer is curious about the thickness of paint on a car at her factory. She randomly selects 30 points on the car and measures the paint thickness at each of those points.

• Population

• Sample

Consider a population which is normally distributed. If\sigma=2 and n=9 , what is the standard deviation of the sampling distribution of sample means?

• 0.67

• 0.22

• 0.44

• 1.33