For which cases one sided test is a better choice then two sided test?

Doctor checks if concentration of active substance in a drug is sufficient

What is a test statistic?

Is a value we derive from the data to reject or fail to reject a hypothesis

Which among the following test conclusions is a false-positive result?

Person convinced by finencial indicator invest into unprofitable business

Which amond the following activities does not look like a statistical test?

Guessing a demand for a product with no prior information

Which among the following events does not belong to the event encoded by p-value?

H0 mean is 10, sample mean is 8, new sample mean is 9

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Statistial testing 1

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1
For which cases one sided test is a better choice then two sided test?
Investor checks if business is profitable
Lottery player tests win probability
Analyst checks if web-site has profitable conversion rate
Doctor checks if concentration of active substance in a drug is sufficient
2
What is a test statistic?
Is a value we derive from the data to reject or fail to reject a hypothesis
Is a number we calculate to confirm the hypothesis is true
Software for statistical research
Statistics is a branch of math that analyses the data
3
Which test should be used for the following question: world bank has issued a new policy, does it affect inflation?
Cannot be answered with statistical testing
Left-sided
Right-sided
Two-sided
4
Which among the following test conclusions is a false-positive result?
Investor avoids investing is a startup that eventually goes broke
Test determines that new drug is harmful and it indeed is harmful
Healthy person diagnosed as healthy
Person convinced by finencial indicator invest into unprofitable business
5
Which amond the following activities does not look like a statistical test?
Measuring delivery times
Conducting A/B testing for a new feature of a website
Guessing a demand for a product with no prior information
Comparing sales data from ongoing and previous months
6
Which among the following events does not belong to the event encoded by p-value?
H0 mean is 10, sample mean is 8, new sample mean is 9
H0 mean is 10, sample mean is 8, new sample mean is also 8
H0 mean is 10, sample mean is 8, new sample mean is 7
H0 mean is 10, sample mean is 8, new sample mean is 1
7
How does increase of FPR affect FNR?
FNR approaches 1/2 as FPR increases
FNR increases
FNR is not affected
FNR decreases
8
In order to reject hypothesis which ineqality must hold?
p-value>alpha
p-value - alpha > 1/3
p-value<alpha
p-value + alpha < 1/2
9
Which false-positive rate is used by default in statistical testing?
0.5
0.05
1
0.25
10
Which conclusion we cannot regorously make as a result of hypothesis testing?
Wrongfully reject a Hypothesis
Rejection of Hypothesis
Acceptance of Hypothesis
Inability to reject a Hypothesis

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