Which Confidence Interval?

How much more effective against insects are plants with an insect resistant gene than plants without this gene? 500 plants with the gene and 500 plants without the gene were measured for the number of insects per plant.

• Matched Pairs

• Two-Sample Mean

• Two-Sample Proportion

• One-Sample Mean

How much does a speed reading course help. A word per minute read was charted before and after the course for 80 students.

• Matched Pairs

• Two-Sample Mean

• Two-Sample Proportion

• One-Sample Mean

How much faster can people type using their dominant hand vs. their non-dominant hand? Words per minute was charted first for 100 people using their dominant hand only and then for the same people using only their non-dominant hand.

• Matched Pairs

• Two-Sample Mean

• Two-Sample Proportion

• One-Sample Mean

You own a restaurant and want to find out how much lettuce is consumed on an average day. You look at total orders during each of 45 consecutive days.

• Matched Pairs

• Two-Sample Mean

• Two-Sample Proportion

• One-Sample Mean

What percent of new businesses in this region are able to keep their doors open a year after starting? 50 new businesses were tracked.

• One-Sample Proportion

• Two-Sample Proportion

• One-Sample Mean

• Two-Sample Mean

How much longer do incandescent light bulbs last compared to florescent bulbs? 55 incandescent bulbs and 45 florescent bulbs were observed.

• Matched Pairs

• One-Sample Mean

• Two-Sample Proportion

• Two-Sample Mean

You have conducted a survey about whether Americans are in favor of additional nuclear power plants being constructed. Determine a likely range of values for the true percent of Americans in favor of the proposition.

• One-Sample Mean

• Two-Sample Mean

• One-Sample Proportion

• Two-Sample Proportion

How much does a speed reading course help. A word per minute read was charted before and after the course for 80 students.

• Matched Pairs

• One-Sample Mean

• Two-Sample Mean

• Two-Sample Proportion