Stat Talk (Vocabulary & Concepts)
What does the term "median" mean?
This measure represents the middle value of a data set.
A fair coin is flipped once. Find the probability of tails.
1/2
What is a bar graph?
A graph with bars used to compare categories is called this.
Find the mean of 2, 4, 6
mean=average answer is 4
What is a parameter?
A confidence interval gives a range of likely values for this population characteristic
What is standard deviation?
This measure shows how spread out data are from the mean.
A die is rolled once. Find the probability of rolling a 3.
1/6
What is a negative correlation?
A scatterplot with points moving downward from left to right shows this relationship.
Find the range of 5, 9, 12, 20
Work: 20-5=15
What is the null hypothesis?
In hypothesis testing, this is the claim being tested.
What is a categorical variable?
This type of variable includes categories like hair color or eye color.
A bag contains 4 red and 6 blue marbles. Find the probability of choosing red.
4/10=2/5
What is the median?
In a boxplot, the line inside the box represents this statistic.
Find the median of 3, 7, 9, 10, 15.
Work: Middle value = 9
Write the alternative hypothesis if a researcher believes the average is less than 50
Ha:(mean)<50
What is a z-score?
This score tells how many standard deviations a value is from the mean.
Two coins are flipped. Find the probability of getting two heads.
1/2 x 1/2=1/4
What does skewed to the right mean?
Skewed to the right is a long tail extending in the direction to the right.
Find the mode of 2, 4, 4, 5, 5, 5, 7
Work: 5 appears most often.
Construct a confidence interval with mean 80 and margin of error 5.
Work: (80-5=75), (80+5=85) Interval: ((75,85))
What is simple random sampling?
This sampling method gives every member of the population an equal chance to be selected.
A card is drawn from a deck of 52 cards. Find the probability of drawing a king.
4/52= 1/13
What is an upward trend?
A line graph showing values steadily increasing over time demonstrates this.
Find the variance of 1, 3, 5
Write the null and alternative hypotheses for a claim that the population mean is greater than 100