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M2W4 - Weekly Assessment Challenge Flashcards | StudBud
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M2W4 - Weekly Assessment Challenge
M2W4 - Weekly Assessment Challenge
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Answers
1
When should you reject the null hypothesis?
alpha < power
alpha > p-value
alpha < p-value
beta < power
2
What is a good null hypothesis for testing if a car manufacturer is lying about emissions?
H0 = the given proportion of mean
H0 = what the experiment returns
H0 = what you think it really is
3
A subgroup that is representative of a population is called
sample
A category
data
4
The entire group of interest for a statistical conclusion is called the
Data
Non of the Above
Sample
Population
5
Type 2 Error is?
I reject H0, but H0 is False.
I reject H0, but H0 is True.
I fail to reject H0, but H0 is False.
I fail to reject H0, but H0 is True.
6
Which of the following distributions is used in statistical inference for proportions?
f
normal
t
chi-square
7
What's the null hypothesis?
μd > 0
μd ≠ 0
μd < 0
μd = 0
8
Random sampling is:
Simply selecting those people that are available at the time
Individuals who have chosen to be involved in the study
Dividing the target population into important sub-categories
Every member of a population has a chance to be elected
9
What is the purpose of an inferential statistical test?
To check the probability of your results applying to the wider population
To make sure you have not made a mistake in your data collection
To see if your results are accurate
10
What is the sampling distribution of a statistic?
The average of all the values taken by the statistic
The distribution of all values taken by it in all possible samples
11
Which of the following will increase the power of a statistical test of significance?
Increase the sample size
Decrease the α level
All of the above
Increase the Type II error probability
12
Proportion hypothesis testing may only be performed with _________ data.
categorical
quantitative
13
What part of the statistics is responsible for examining trends or distributions?
Descriptive
Inferential
Probability
None of above
14
Inferential statistics take a _____from a ____ and making estimates about the ___
sample, data, population
sample, population, population
sample, pollution, population
data, sample, population
15
Inferential statistics help you do which of the following?
organize data
display data
describe data
draw conclusions about a population
16
What are the three most common confidence intervals?
90%, 95%, 99%
0%, 50%, 100%
68%, 95%, 99.7%
80%, 90%, 100%
17
The P-value of a statistical test is
Probability of the observation or one more extreme occurring
The probability that the alternative is true.
The probability that the null is true.
Given H0 is true, prob. of observing at least as extreme as the statistic
18
What is statistical significance?
The likelihood that a statistic is not important.
The likelihood that a statistic did not occur by chance.
The likelihood that a statistic is highly important.
The likelihood that a statistic is relevant to the analysis.
19
Statistical inference occurs when you:
take a complete census of a population
take the results of a sample and reach conclusions about a population
present a graph of data
compute descriptive statistics from a sample
20
Type 1 Error is?
I fail to reject H0, but H0 is False.
I reject H0, but H0 is True.
I reject H0, but H0 is False.
I fail to reject H0, but H0 is True.
