Final Review CW/HW #15
Are some times at which classes are offered more popular than others? Seven sections of the same math classes were offered and enrollments of each were tabulated.
Chi-Square Goodness of Fit Test
In 1974, each acre of the Tahoe basin was assessed to see what condition the soil was in. 23% of acres were of type I, 32% were of type II, 41% were of type III, and 16% were of type IV. This year the region was assessed again and the number of each type were again determined. Is there evidence to suggest that the distribution of soil types has changed since 1974?
Chi-Square Goodness of Fit Test
Does knowing a person's blood type help to predict their favorite beverage? 1000 people were asked what their blood type is and what type of beverage they most often drink.
Chi-Square Test for Independence
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.
Confidence Interval for Paired Data (Dependent Samples)
You are interested in estimating the number of squirrels per acre in the area. The number of squirrels was measured at 98 acres.
Confidence Interval for a Population Mean
What percent of Tahoe residents have swam in the lake? 1008 residents were surveyed.
Confidence Interval for a Proportion
Do more than 70% of statistics students pass their course? 200 statistics students were observed.
Confidence Interval for a Proportion XX Chi-Square Goodness of Fit Test XX Confidence Interval for a Population Mean XX Hypothesis Test for a Population Mean
How much better is the average return on a high-risk mutual fund compared to a low-risk mutual fund? 38 high-risk funds and 56 low-risk funds were charted.
Confidence Interval for the Diff. Between 2 Means (Independent Samples)
Over the past many years, the average daily attendance at the theatre was 147. This year forty randomly selected days produced a mean of 150. Has attendance improved this year?
Confidence Interval for the Diff. Between 2 Means (Independent Samples) XX Chi-Square Goodness of Fit Test XX Confidence Interval for the Difference Between 2 Proportions XX Hyp. Test for the Difference Between 2 Means (Independent Samples)
Estimate how effective are instant store coupons in getting customer to purchase an item. 500 customers were observed when the instant store coupon was available and 400 were observed when it was not available.
Confidence Interval for the Difference Between 2 Proportions
Does election-spending reform truly curtail spending? Races in 50 counties throughout the US were studied before and after the passage of the election spending reform act.
Hyp. Test for Paired Data (Dependent Samples)
Are male swimmers faster than female swimmers? 40 men and 30 women were selected at random to swim in a 100-meter race.
Hyp. Test for the Difference Between 2 Means (Independent Samples)
Does holding on to a crystal improve psychic ability? 5000 people were each asked to guess the outcome of a coin toss first without the crystal and then while holding the crystal.
Hyp. Test for the Difference Between 2 Proportions
Are more crimes committed during the daylight hours compared to night? Police records from 200 consecutive days were considered.
Hyp. Test for the Difference Between 2 Proportions XX Confidence Interval for the Diff. Between 2 Means (Independent Samples) XX Hyp. Test for the Difference Between 2 Means (Independent Samples) XX Confidence Interval for the Difference Between 2 Proportions
An amusement park owner is considering changing her model from "pay for each ride" to "one fee for all rides." She observes 2000 guests to see if they spend less than the $30 fee that she intends to put into place.
Hypothesis Test for a Population Mean
You suspect that a casino is using a Roulette wheel that is unfair. You observe the outcome of the wheel 900 times so see if each number is equally likely to be selected.
Hypothesis Test for a Population Mean XX Confidence Interval for a Population Mean XX Hypothesis Test for a Population Mean XX 1-Way ANOVA
Does the parking lot have the same number of cars each weekday? Cars were tallied Monday, Tuesday, Wednesday, Thursday, and Friday.
Hypothesis Test for a Population Proportion XX 1-Way ANOVA XX Confidence Interval for a Population Mean XX Hypothesis Test for a Population Mean
