Statistics Proportion and Mean

What does the symbol represent?

• standard deviation from a sample

• standard deviation from a population

• mean of the sampling distribution of sample proportions

• mean of the sampling distribution of sample means

• standard deviation of the sampling distribution of sample means

What does the symbol represent?

• proportion from a sample

• proportion from a population

• probability of something happening

• probably didn't learn this

• mean of the sampling distribution of sample proportions

What does the symbol represent?

• mean from a sample

• mean from a population

• proportion from a population

• mean of the sampling distribution of sample means

• proportion from a sample

What does the symbol represent?

• mean from a sample

• mean from a population

• proportion from a population

• mean of the sampling distribution of sample means

• proportion from a sample

Review!

• exact y-value

• predicted y-value

• y-value from a sample

• y is Mrs. Keelen making us do this?

28% of all Woodrow students believe Monday will be snow day. You take a sample of 50 students and find that 15 of them believe Monday will be a snow day. What does 50 represent? 

• n

• P

• phat

• standard deviation

At a particular college, 78% of all students are receiving some kind of financial aid.The school newspaper selects a random sample of 100 students and 72% of the respondents say they are receiving some sort of financial aid. Which of the following is true?

•  78% is a population and 72% is a sample.

• 72% is a population and 78% is a sample

• 78% is a parameter and 72% is a statistic

• 72% is a parameter and 78% is a statistic

The Gallup Poll asked a random sample of 1785 adults whether they attended church during the past week.  Let p-hat be the proportion of people in the sample who attended church.  A newspaper report claims that 40% of all U.S. adults went to church last week.  Suppose this claim is true. 
Calculate the standard deviation of the sampling distribution. 

• 0.0116

• 0.0117

• 0.0118

• 0.0119

The Gallup Poll asked a random sample of 1785 adults whether they attended church during the past week.  Let p-hat be the proportion of people in the sample who attended church.  A newspaper report claims that 40% of all U.S. adults went to church last week.  Suppose this claim is true. 
Calculate the standard deviation of the sampling distribution.  (Check to see if the 10% condition is met first)

• 0.0116

• 0.0117

• 0.0118

• 0.0119

53.2% of applicants are accepted into UConn. In a sample of 100 UConn applicants, 45 of them were accepted. What is the parameter?

• All UConn applicants.

• The 100 applicants in the sample.

• 53.2% acceptance rate.

• 45% of accepted in sample.