2Sample or PairedT

2-Sample, Paired, or Neither?

Random samples of 50 men and 50 women are asked to imagine buying a birthday present for their best friend. We want to estimate the difference in how much they are willing to spend.

• 2-Sample

• Paired

Confidence Interval or Hypothesis Test?

Random samples of 50 men and 50 women are asked to imagine buying a birthday present for their best friend. We want to estimate the difference in how much they are willing to spend.

• Hypothesis test

• Confidence interval

2-Sample, Paired, or Neither?

Mothers of twins were surveyed and asked how often in the past month strangers had asked whether the twins were identical?

• 2-Sample

• Paired

• Neither

Confidence Interval or Hypothesis Test?

Mothers of twins were surveyed and asked how often in the past month strangers had asked whether the twins were identical.

• Confidence interval

• Hypothesis test

2 Sample, Paired, or Neither?

Are parents equally strict with boys and girls? In a random sample of families, researchers asked a brother and sister from each family to rate how strict their parents were.

• 2-Sample

• Paired

• Neither

Confidence Interval or Hypothesis Test?

Are parents equally strict with boys and girls? In a random sample of families, researchers asked a brother and sister from each family to rate how strict their parents were.

• Confidence interval

• Hypothesis test

2-Sample, Paired, or Neither?

Forty-eight overweight subjects are randomly assigned to either aerobic or stretching exercise programs. They are weighed at the beginning and at the end of the experiment to see how much weight they lost.

• 2-Sample

• Paired

• Neither

2-Sample, Paired, or Neither?

Spreading fires tend to do more damage to hardwood forests than do spot fires. Data on the percent of trees scarred by fire can be used to quantify the difference in the extent of damage.

• 2-Sample

• Paired

• Neither

2-Sample, Paired, or Neither?

An environmentalist is interested in whether or not education would help students properly use recycling bins. He randomly selects 10 days before his presentation and 10 days after his presentation to count the number of non-plastic items in the plastic bottling recycling container at Town Square.

• 2-Sample

• Paired

• Neither

2-Sample, Paired, or Neither?

Was there a difference in speeds between the inner and outer speed-skating lanes at the 2014 Winter Olympics?

• 2-Sample

• Paired

• Neither