Matched Pairs Confidence

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

Construct a 95% confidence interval estimate of the mean of population differences between hospital admissions on Friday the 6th compared with hospital admissions on Friday the 13th. Are hospital admissions affected by Friday the 13th? (Matched Pairs)

• (-8.3, -1.6)

  Hospital admissions are not affected

• (-6.5, -0.2)

  Hospital admissions are affected

• (-6.5, -0.2)

  Hospital admissions are not affected

• (-8.3, 1.6)

  Contains zero – no difference

Using a 95% confidence level, construct a confidence interval to test the claim that those treated with magnets have a greater mean pain reduction in pain than those who receive a sham (placebo) treatment.

• (-0.45, 0.55)

  Contains zero – no difference

• (-0.6, 0.7)

  Contains zero – no difference

• (-0.99, 1.09)

  Contains zero – no difference

• (-0.72, 0.82)

  Contains zero – no difference

Researchers claim that a blue background enhances creativity based on the average scores below. Test the claim at a 99% confidence level.

• P = .0021

  We are more creative with blue

• P = 0.99

  We are more creative with blue

• P = .0021

  We are more creative with red

• P = 0.99

  There appears to be no difference

In a 95% confidence interval, what percent of the curve is in each tail?

• 5%

• 2.5%

• 47.5%

• 95%

A travel company is investigating whether the average cost of a hotel stay in a certain city has increased over the past year. The company recorded the cost of a one-night stay for a Friday night in January of the current year and in the previous year for 31 hotels selected at random. The difference in cost (current year minus previous year) was calculated for each hotel. Which of the following is the appropriate test for the company’s investigation?

• 1 sample t interval

• 1 sample t test

• 2 sample t interval

• 2 sample t test

• Matched Pairs analysis

To study the effectiveness of a certain adult reading program, researchers will select a random sample of adults who are eligible for the program. The selected adults will be given a pretest before beginning the program and a posttest after completing the program. The difference in the number of correct answers on the pretest and the number of correct answers on the posttest will be recorded for each adult in the sample. Which of the following is the most appropriate inference procedure for the researchers to use to analyze the results?

• sample t interval

• sample t test

• sample t interval

• sample t test

• Matched Pairs analysis

A sociologist studying the difference in ages between husbands and wives obtained a random sample of 55 married couples. The mean of the husbands’ ages was 38.5 years with standard deviation 12.6 years. The mean of the wives’ ages was 36.9 years with standard deviation 12.4 years. The sociologist calculated the difference between the ages for each couple. The mean difference was 1.6 years with standard deviation 2.1 years.

• sample t interval

• sample t test

• sample t interval

• sample t test

• Matched Pairs analysis