WorksheetsExam 1 Review (STAT 240)
Total questions: 12
Worksheet time: 12mins
Let X = (3, 8, 6, 1, 5, 5, 4, 3, 9, 6). The symbol we use for writing "adding up the numbers in X" is called a(n):
Sigma
Product
Summation
Associative
For symmetric data, the mode is equal to the mean.
Given the sum of squared differences is 414 with n=100, the standard deviation is:
4.14
2.033
42
20.3/10
The three pillars of experimental design are Control, Randomization, and Reduction of Bias.
The best way to locate outliers is the:
(a)
Confounding is when the effect of two variables is completely inseparable.
A variable that can take on partial values and zero represents absence is referred to as:
quantitative, continuous, ordinal
quantitative, discrete, nominal
qualitative, discrete, ratio
quantitative, discrete, ratio
The benefits of cohort studies are:
information dense data
cost-effective
results are causal
clear effect of time
A researcher tests a new diet for dairy cattle by separating the cattle by age and randomly administering a control diet and the new diet within each age group. This study is called:
Stratified Sampling
Completely Randomized Design
Case-Control Design
Randomized Complete Block Design
Repeated measure designs are impossible to bias as long as you use a double-blind method.
The difference between frequency and relative frequency is:
The data must be symmetric to be shown as relative frequency.
Relative frequency uses proportions instead of count.
Data can only be shown as relative frequency if their densities add up to 1.
Frequency can only show numeric data, but relative frequency can show numeric and categorical data.
The first quartile is equal to which quantile?
Quantile 1.
50th Quantile.
25th Quantile.
Neither, quantiles are quartiles.
