1 In an attempt to document the percentage of teenagers in the United States who play video games for more than 4 hours per day, the group Concerned Citizens for Teenage Welfare surveyed 2,000 teenagers randomly selected from across the United States. It was discovered that 33% of teenagers surveyed play video games for more than 4 hours per day. Concerned Citizens for Teenage Welfare released a statement saying: "If you are the parent of the 33% of teenagers in America who play video games for more than 4 hours per day, you should consider engaging your teen in at least one other activity per day."

What does the value 33% of teenagers surveyed represent?

It represents the random sample.

It represents the population parameter.

It represents the sample statistic.

It represents an inference about teenagers in the United States.

2 In a survey taken in July 1985, of the 50 households randomly surveyed from across the United States, the proportion of households having a personal computer was determined to be 11%. The U.S. government census data taken in August 1985 suggested that 11.7% of households in the United States had a personal computer.

Which statement(s) below support the small discrepancy between the sample proportion of households having a personal computer in July 1985 and the population proportion of households having a personal computer in August 1985?

I The sample size was too small.

II The sample was not truly random.

III The data from July 1985 to August 1985 changed substantially.

IV The sample statistic is nearly equal to the population parameter and will never be exactly equal.

Only statements I, II, and III support the discrepancy.

Only statements I and III support the discrepancy.

Only statements I and IV support the discrepancy.

Only statement IV supports the discrepancy.

3 The dean at a large college wants to determine the average SAT scores for students who apply from New York. She surveyed 80 students from New York and discovered a mean SAT score of 1,512.

Which of the statements below represent the statistic and the sample, respectively, of the survey?

I The mean SAT score of all students from New York

II The mean SAT score of 80 students from New York

III The 80 students who apply to the college from New York

IV All students who apply to the college from New York

Statements I and II

Statements II and III

Statements I and IV

Statements II and IV