STAT 121 Exam 1

Which of the following is not a principle of valid experimentation?

What is the symbol for population mean?

The sum of all probabilities in a probability distribution is equal to 1.

mean = 25 standard deviation = 5 What is the probability that I get a value greater than 27?

What are the three values of the empirical/standard deviation rule?

What does RBD stand for?

A researcher samples twenty males and twenty females in his study. What type of sample is this?

x = 15, μ = 20, σ = 3.7 What percentage of values are greater than 15?

The normal distribution is also know as...

The shape of a distribution where the mean exceeds the median.

We cannot perform a valid experiment without double blinding.

14, 12, 11, 20, 23, 17, 18, 6, 19, 19, 13, 21, 21, 22 What is the median?

The Standard Deviation is...

I randomly assigned 50 volunteers to three different treatment groups. What kind of experiment did I perform?

I randomly assign 20 volunteers to put lotion on one hand and nothing on the other hand. This is a...

Q1 = 23, Q3 = 27 What is the IQR?

The z-distribution has a mean of 0 and a standard deviation of 1.

We sample because it is usually too expensive/hard/impossible to do a...

We use samples to make inferences about what?

I can find the mean of a distribution by looking at the middle line of a boxplot?

Stand at the door and take the first 100 people that walk by. What type of sample?

...has 25% of the data above it.

What does SRS stand for?

What is the symbol for median?

Statistics is useful ;)

A histogram is the best graph for displaying categorical data.

Every normal distribution has a mean of 0 and a standard deviation of 1.

x = 15, μ = 20, σ = 3.7 What is the z-score?

5 number summary: 5, 17, 20, 23, 28 Are there any outliers?

...is the recommended plot for displaying small quantitative data sets.

What is the symbol for sample mean?

The z-score is equal to the number of standard deviations away from the median.

A distribution where the left side of the distribution extends in a long tail is...