categorizing Stat Problems

When road conditions are snowy, how much faster do people who have four wheel drive vehicles drive compared to those who have two wheel drive vehicles? 45 four wheel drive vehicles and 40 two wheel drive vehicles were clocked.

• Confidence Interval for a Population Mean

• Confidence Interval for a Proportion

• Confidence Interval for the Diff. Between 2 Means (Independent Samples)

• Confidence Interval for Paired Data (Dependent Samples)

A police chief is interested in estimating the average amount of money that is stolen during a bank robbery. She investigates 42 recent bank robberies.

• Confidence Interval for a Population Mean

• Confidence Interval for a Proportion

• Confidence Interval for the Diff. Between 2 Means (Independent Samples)

• Confidence Interval for Paired Data (Dependent Samples)

• Confidence Interval for the Difference Between 2 Proportions

A child psychologist wants to estimate the mean difference between the number of words children can recall when they hear them and the number of words they can recall when then see them on a written page. Fifty-two children were each read to and asked how many words they recalled and then they were asked to look at a book and asked how many words they recalled.

• Confidence Interval for a Population Mean

• Confidence Interval for a Proportion

• Confidence Interval for the Diff. Between 2 Means (Independent Samples)

• Confidence Interval for Paired Data (Dependent Samples)

• Confidence Interval for the Difference Between 2 Proportions

What is the president's approval rating? 1500 US citizens were asked whether they approved of the job that the president was doing.

• Confidence Interval for a Population Mean

• Confidence Interval for a Proportion

• Confidence Interval for the Diff. Between 2 Means (Independent Samples)

• Confidence Interval for Paired Data (Dependent Samples)

• Confidence Interval for the Difference Between 2 Proportions

Forty-five LTCC students were asked how much money they spent on textbooks and how much money they spent on tuition. Estimate the mean difference between the average amount of money students spend on books and how much they spend on tuition.

• Confidence Interval for a Population Mean

• Confidence Interval for a Proportion

• Confidence Interval for the Diff. Between 2 Means (Independent Samples)

• Confidence Interval for Paired Data (Dependent Samples)

• Confidence Interval for the Difference Between 2 Proportions

Are African Americans taller than Caucasians? 10,000 African Americans and 10,000 Caucasians were measured.

• Hypothesis Test for a Population Mean

• Hypothesis Test for a Population Proportion

• Hyp. Test for the Difference Between 2 Means (Independent Samples)

• Hyp. Test for Paired Data (Dependent Samples)

• Hyp. Test for the Difference Between 2 Proportions

Does meditation lower stress? The average stress level is 42. 87 people who meditated averaged 38. What can be concluded?

• Hypothesis Test for a Population Mean

• Hypothesis Test for a Population Proportion

• Hyp. Test for the Difference Between 2 Means (Independent Samples)

• Hyp. Test for Paired Data (Dependent Samples)

• Hyp. Test for the Difference Between 2 Proportions

Are tourists on the North Shore more likely to rent a boat than tourists on the South Shore? 50 North Shore tourists and 50 South Shore tourists were surveyed.

• Hypothesis Test for a Population Mean

• Hypothesis Test for a Population Proportion

• Hyp. Test for the Difference Between 2 Means (Independent Samples)

• Hyp. Test for Paired Data (Dependent Samples)

• Hyp. Test for the Difference Between 2 Proportions

Is a man who walks into a car dealership more likely to purchase an automobile than a woman? 70 men and 60 women were observed.

• Hypothesis Test for a Population Mean

• Hypothesis Test for a Population Proportion

• Hyp. Test for the Difference Between 2 Means (Independent Samples)

• Hyp. Test for Paired Data (Dependent Samples)

• Hyp. Test for the Difference Between 2 Proportions

A study was done to see how much gas Americans consume. 600 Americans were asked how far they lived from their work and how many gallons of gas they used each week. Find a confidence interval for the mean amount of gas that is used by Americans who live 15 miles from work.

• Prediction for a Single Value of y for a Fixed x

• Chi-Square Goodness of Fit Test

• Chi-Square Test for Independence

• Chi-Square Test for Homogeneity