STUDENTS SUCCESS
Revision Examination Tests
“Come all for this greatness”
...100% Correct Ans...
DSC1630 ASSIGNMENT 5 SEMESTER 1 2024 /2025 - DISTINCTION
GUARANTEED 100%
In an inference about a result of a sample...
ans:>Talk about it in terms of the population
Cross sectional data vs. Time series data
ans:>Cross sectional data: Data collected at a single point in time
Time series data: Data collected over a period of time
Representative sample
ans:>Taking a sample that accurately describes the population. Random
sample is the best representative sample.
Ratio and Interval measurements (numerical)
ans:>Ratio: True zero point (height, age, income)
Interval: No true zero, just another value (Temperature)
Nominal and Ordinal measurements (non numeric)
ans:>Nominal: categories where order doesn't matter (Gender)
Ordinal: categories where order does matter (Level of happiness in a
survey)
Observational Study
ans:>A study where the variables in the experiment are not altered
Elements in a study
ans:>What is being sampled, what or who is in the study, the items in
which data is being collected
,The summarizes of data, which may be tabular, graphical, or numerical
are referred to as....
ans:>Descriptive statistics
Positive vs negative relationship in a scatter diagram
ans:>Positive: As one increase, the other increases
Negative: As one Increases, the other decreases
Graphs used for categorical data
ans:>bar chart, pie chart
Graphs used for quantitative data
ans:>Histogram, scatter diagram
Sample standard deviation
ans:>S
S^2 (is the sample variance)
Population standard deviation
ans:>Sigma
Sigma^2 (is the population variance)
Events A and B are mutually exclusive....
ans:>P(A u B) = P(A) + P(B)
The interquartile range is used as a measure of variability to overcome
what difficulty of the range?
ans:>Too many extreme values
5 number summary of data graphically is a...
ans:>Box plot and includes
Smallest value
Q1
Median
Q3
Largest value
The ____ is a descriptive statistic not measured in the same units as the
data
, ans:>Variance
The median is better than the mean when...
ans:>There are outliers
The correlation coefficient is measured from...
ans:>-1 to 1
The empirical rule can only be applied if the distribution is bell shaped
(T/F)
ans:>True
Combination order of selection...
ans:>Does not matter
Mutually exclusive events mean...
ans:>They cannot happen at the same time
Positively skewed distribution
ans:>Large tail to the right, hump to the left
Negatively skewed distribution
ans:>Large tail to the left, hump to the right
Covariance measures..
ans:>The relationship between 2 variables (positive or negative)
Correlation coefficient measures...
ans:>The strength of the linear relationship
The expected value of a random variable is the...
ans:>Mean value
Characteristics of binomial probability distribution
ans:>1. There are "n" identical trials
2. Each trial has 2 Possible outcomes
3. The probabilities do not change from one trial to another
4. Independent trials
Excel command used to find P(Z > 1.57)
Revision Examination Tests
“Come all for this greatness”
...100% Correct Ans...
DSC1630 ASSIGNMENT 5 SEMESTER 1 2024 /2025 - DISTINCTION
GUARANTEED 100%
In an inference about a result of a sample...
ans:>Talk about it in terms of the population
Cross sectional data vs. Time series data
ans:>Cross sectional data: Data collected at a single point in time
Time series data: Data collected over a period of time
Representative sample
ans:>Taking a sample that accurately describes the population. Random
sample is the best representative sample.
Ratio and Interval measurements (numerical)
ans:>Ratio: True zero point (height, age, income)
Interval: No true zero, just another value (Temperature)
Nominal and Ordinal measurements (non numeric)
ans:>Nominal: categories where order doesn't matter (Gender)
Ordinal: categories where order does matter (Level of happiness in a
survey)
Observational Study
ans:>A study where the variables in the experiment are not altered
Elements in a study
ans:>What is being sampled, what or who is in the study, the items in
which data is being collected
,The summarizes of data, which may be tabular, graphical, or numerical
are referred to as....
ans:>Descriptive statistics
Positive vs negative relationship in a scatter diagram
ans:>Positive: As one increase, the other increases
Negative: As one Increases, the other decreases
Graphs used for categorical data
ans:>bar chart, pie chart
Graphs used for quantitative data
ans:>Histogram, scatter diagram
Sample standard deviation
ans:>S
S^2 (is the sample variance)
Population standard deviation
ans:>Sigma
Sigma^2 (is the population variance)
Events A and B are mutually exclusive....
ans:>P(A u B) = P(A) + P(B)
The interquartile range is used as a measure of variability to overcome
what difficulty of the range?
ans:>Too many extreme values
5 number summary of data graphically is a...
ans:>Box plot and includes
Smallest value
Q1
Median
Q3
Largest value
The ____ is a descriptive statistic not measured in the same units as the
data
, ans:>Variance
The median is better than the mean when...
ans:>There are outliers
The correlation coefficient is measured from...
ans:>-1 to 1
The empirical rule can only be applied if the distribution is bell shaped
(T/F)
ans:>True
Combination order of selection...
ans:>Does not matter
Mutually exclusive events mean...
ans:>They cannot happen at the same time
Positively skewed distribution
ans:>Large tail to the right, hump to the left
Negatively skewed distribution
ans:>Large tail to the left, hump to the right
Covariance measures..
ans:>The relationship between 2 variables (positive or negative)
Correlation coefficient measures...
ans:>The strength of the linear relationship
The expected value of a random variable is the...
ans:>Mean value
Characteristics of binomial probability distribution
ans:>1. There are "n" identical trials
2. Each trial has 2 Possible outcomes
3. The probabilities do not change from one trial to another
4. Independent trials
Excel command used to find P(Z > 1.57)
