Statistics Assessment (Weekly Assignment #3)

1) If the heights of 50 randomly selected students from Calhoun are taken to estimate the mean height of all Calhoun students, the 50 students chosen represent a

• Sample

• Population

• Census

• Mean

2) The standard deviation of a population characteristics measures

• The difference between the maximum and minimum values.

• The difference between the third quartile and first quartile values.

• The average distance a data value is away from the mean.

• The average distance a data value is away from the median.

3) A survey given to 30 random freshmen from the 560 students at a local high school concludes that 65% of the freshmen attend home sporting events. What is the population of this survey?

• All freshmen at the school

• The 30 freshmen surveyed

• People attending sporting events

• All 560 high school students

4) Which group should be surveyed to determine how people commute to work in order to produce a random sample?

• Students in your school

• People passing through a toll booth on a given day

• People in your state whose last name begins with S

• People whose annual income is greater than $1,000,000

5) In which of the following cases would an observational study be necessary as compared to an experiment?

• The study of how increased nutrient levels affect plant growth.

• The study of how educational levels affect median household income.

• The study of how a vaccine affects the percent of mice that get a particular disease.

• The study of how noise level affects the sleep patterns of volunteers in a sleep study.

6) The test scores for Mike’s 3^rd marking period were 97, 98, 95, 97. The teacher computed the mean and standard deviation. She then decided to give one more test in which Mike only got a 62%. What will this last score do to his mean and standard deviation?

• Increase the mean and increase the standard deviation

• Decrease the mean and decrease the standard deviation

• Decrease the mean and increase the standard deviation

• Increase the mean and decrease the standard deviation

7) I want to find the mean height of all Calhoun HS students. Which sample group of students would get a mean score closest to the actual mean height of all students?

• 50 random students from my Algebra 2/Trig classes

• 50 random boys found in the hallways

• The first 50 students who walk into the school one morning

• Any 50 students I want to choose

8) The histogram can be described as which of the following

• Skewed Left

• Skewed Right

• Symmetric

• Discrete Distribution

9) On a normally distributed standardized test, the mean is 76 and the standard deviation is 4. Between which two scores will approximately 68% of the data fall?

• 72 and 80

• 76 and 80

• 74 and 78

• 68 and 84

10) Which statement about statistical analysis is false?

• Experiments can suggest patterns and relationships in data.

• Experiments can determine cause and effect relationships.

• Observational studies can determine cause and effect relationships.

• Observational studies can suggest patterns and relationships in data.