Taking Chances
Normality is Overrated
Center Yourself
Inferential Matters
Stats
Potpourri
Potpourri
100
This number is the probability of rolling a 7 with a pair of six-sided dice.
What is 0.167?
100
Of the four normal curves shown below, it's the one with the largest mean.
What is curve D?
100
If a population is right-skewed and we take samples with sample size 35, then the sampling distribution will have this shape.
What is normal?
100
In a hypothesis test, this is what we do if the p-value is less than the significance level.
What is reject the null hypothesis.
100
It's the X-value that cuts of the highest 10% of the data.
What is the 90th percentile?
200
One hundred people were asked whether they preferred dogs or cats as pets, and the results are in the table below.
This is the probability that one of the respondents was a male who preferred cats.
What is 0.1?
200
If new bicycle prices are normally distributed with a mean of $300 and a standard deviation of $40, this number is the probability that a randomly chosen bike costs between $220 and $340.
What is 0.819?
200
If 25-pound bags of dog food are normally distributed with a mean weight of 25.2 lbs and a standard deviation of 0.15 lbs, this is the probability that an individual bag of dog food weighs more than 25 lbs.
What is 0.909?
200
That's the test you would use if you wanted to find out of there was a significant difference between the average price per gallon of gas in San Francisco, Los Angeles, San Diego, and San Jose.
What is the Analysis of Variance (ANOVA) Test for 3+ Numerical Variables?
200
When the population is movies, the runtime of a movie is this type of quantitative variable.
What is continuous?
300
An MP3 player is set to play songs at random from the fifteen songs it contains in memory. Any song can be played at any time, even if it is repeated. There are 5 songs by Band A, 3 songs by Band B, 2 by Band C, and 5 by Band D. If the player has just played two songs in a row by Band D, this number is the probability that the next song will also be by Band D.
What is 0.333?
300
According to the Empirical Rule, that's the percent of the normally distributed data that is within 3 standard deviations of the mean.
What is 99.7?
300
If 25-pound bags of dog food are normally distributed with a mean weight of 25.2 lbs and a standard deviation of 0.15 lbs, this is the probability that a sample of 50 bags has a mean weight of more than 25 lbs.
What is 1?
300
Experimental studies can show this, but observational studies cannot.
What is cause and effect?
300
If the population is our section of Introduction to Statistics, daily attendance is this type of quantitative variable.
What is discrete?
400
One hundred people were asked whether they preferred dogs or cats as pets, and the results are in the table below.
This is the probability that one of the female respondents preferred cats.
What is 0.5?
400
This number is the z-score of a 250-pound lion if lion weights are normally distributed with a mean of 400 lbs and standard deviation of 75 lbs.
What is -2?
400
Every month a customer support center gets roughly 1,000 calls about some issue with their service. For quality assurance, each month the manager takes a simple random sample of 40 reports and finds that an average of 25% of problems require more than one call. This number is the standard error of the sampling distribution.
What is 0.068?
400
That's what you get when you fail to reject a false null hypothesis.
What is a Type II Error (or a false negative)?
400
P(not A)= 1-P(A) is this rule.
What is compliment?
500
That number is P(x > 6) in a binomial experiment with 19 trials and a probability of success of 0.25 for each trial.
What is 0.175?
500
If the weights of guinea pigs are normally distributed with a mean of 2 lbs and standard deviation of 0.5 lb, guinea pigs that weigh this are considered unusually chunky.
What is 3 lbs or more?
500
If 45% of all bunnies in the world are brown, this number is the probability that in a sample of 60 bunnies, between 30% and 40% of them are brown.
What is 0.208?
500
This is the sample statistic at the center of a confidence interval.
What is a point estimate?
500
It's data from an entire population.
What is a census?