Statistics

The POPULATION in statistics is best described by...

• a collection, or set, of individuals, objects, or events whose properties are to be analyzed

• the total number of people that live in a particular city

• the incomplete collection of individuals or objects that are of interest to the sample collector

• a collection of people that are being analyzed for membership on a list of particular elements to be studied

A sample is...

• a subset of a population

• an infinite selection of a population

• a characteristic of a population

• a data value generated by the statistical information

The average waist size for teenage males is 29 inches with a standard deviation of 1.4 inches. If waist sizes are normally distributed, what is the probability of teenagers who will have waist sizes greater than 31 inches?

• 0.9236

• 0.1050

• 0.1600

• 0.0764

Given a mean of 75 and a standard deviation of 7, what percentage of scores are between 75 and 82?

• 68%

• 81.5%

• 16%

• 34%

Given a mean of 75 and a standard deviation of 7, what percentage of scores are above 82?

• 34%

• 81.5%

• 16%

• 2.5%

a key feature of a naturalistic observation is..

• participants are observed in controlled conditions

• participants are observed in an artificial environment

• participants are observed in their natural environment

• there will be demand characteristics

Unbiased sampling is:

• when you choose the group you think will represent the sample
• when any member of the population is equally likely to be chosen for the sample

Mrs. Boyd wants to find the average height of all her students in her classes. She decides to use the first 5 people who walk in the door. Is this a good representative sample?

• Yes
• No

Devon polled 642 drivers late on a Friday night.
Is this a random sample of the drivers in the city?

• Yes because this represents all the drivers in the city well.
• No, because this only represents people late on a friday night