Product Analyst

If the significance level α is set, with a probability of Type I error equal to 1, what will happen?

How did you evaluate ROI? Tell me.

What is dispersion?

What is the null hypothesis for the chi-square test?

How would you conduct an A/B test step by step?

Is it necessary to look at metrics other than the target one?

Is there any sense in conducting an A/B test at α = 1?

- Python You have a table 'orders' with order_id, created_dt, user_id, price, discount There is also a reference table 'users' with id, reg_date, city Write Python code to calculate the average check for each city and the average number of orders per user for the first quarter of the current year.

Table with 1 column: id --- 1 2 3 4 5 NULL NULL 1) What will the function return in a query like: -- SELECT ... FROM table count(*) = count(1) = count(id) = count("id") = count(NULL) = 2) min(id) = max(id) = sum(id) = avg(id) =

A study was conducted that 90% of accidents are committed by sober drivers, and 10% by drunk drivers. Can this mean that sober driving is 9 times more dangerous than drunk driving? Confirm with calculations.

How were tasks assigned to you, who decomposed them, and who made decisions? Provide an example of a task.

Suppose there are only 100,000 drivers. How then would you calculate and interpret the risk of an accident?

If each value of the sample is multiplied by 5, how will the variance change?

If you add 5 to each value, how will the variance change?

What is the name of the effect that is hypothesized in advance and is intended to be detected?

What is a p-value?

How are the duration of a test, sample size, and experiment design determined?

Tell me about a case with an A/B test: what was the test and what did you do in it?

What types of statistical criteria do you know?

Tell about a Type II error.