Data
Grade classification (Freshmen, Sophomores, Juniors, Seniors) is considered as what type of data?
Ordinal Categorical/Qualitative
Generally speaking, we should use a _____ to visualize categorical data and a _____ to visualize numerical data.
bar graph, histogram
A value that lies outside of the other data values is called a(n) _______.
outlier
Calculate the mean of the following numbers: 95, 93, 90, 99, 98, 91, 96, 90
94
Using the empirical rule, what percentage falls between 1 standard deviation above and below the mean?
68%
The distance from which a first year students can kick a field goal is classified as what type of data?
Continuous Numerical/Quantitative
In what type of distribution does mean=median=mode?
Normal
What is the value of x so that the range is 25?
50, 55, 61, 70, x
75
Calculate the standard deviation of this small dataset: 3,9,7,5,11
3.16
What theorem states that the shape of a sampling distribution can be assumed to be Normal, regardless of the original distribution shape, as long as the sample size is large enough.
The Central Limit Theorem
When time/place affect the sample of the people chosen, this is considered what type of bias?
under/over-representation
How would we describe a histogram that has 3 peaks?
multimodal
A student was given the information below and determined the median. Explain the mistake: 10, 17, 10, 19, 17, 20, 32 Answer: median=19
Numbers not in order. Median=17
Calculate the mean of the first 5 prime numbers.
5.6
Americans watch an average of 4.58 hrs of TV each day with a standard deviation of 2.1 hrs. If a random sample of 250 Americans are selected what are the mean and standard error of the sampling distribution?
mean=4.58, standard error=0.133
A phone-in survey is conducted by a radio station to see how many listener enjoy talking segments versus music segments. This is an example of what type of bias?
Self-selected / Voluntary
When data is right/left skewed we would use _____ to measure the center and _____ to measure the spread.
median, IQR
What is the value of x so that the mean, median and mode is 8?
3, 8, 4, 8, x, 5, 8
20
The mean of the following numbers is 4, solve for x:
7, 4, 6, x, 5, 3, 2
1
A set of data with a mean of 60 and a standard deviation of 7.9 is normally distributed. Find the z-score if x=71.
1.39
Variables that are considered external to the study that affect the relationship between study variables are called _______.
Lurking / Confounding
The five number summary is for what type of visual representation? And what are the five numbers?
Boxplot,
Min, Q1, Median, Q3, Max
Give the five number summary: 65, 73, 88, 90, 91, 93, 101
Min=65, Q1=73, Median=90, Q3=93, Max=101
If the mean is 100 and SD is 15 of a normally distributed dataset, what value marks z=-2?
70
Given a normal distribution with mean = 35 and sd = 5. What percentage of the data falls between 25 and 40?
About 81.5%