What is the chi-squared test? The chi-squared test, often written as χ 2 test, is a statistical hypothesis test used in the analysis of categorical variables to determine whether observed data are ...

British Airways is now offering Covid-19 test kits for its customers for just £33, far below the regular price tag of £100-plus. The rapid antigen tests, by Government-approved firm Qured, can be ...

Testing and vaccinations are the twin weapons health officials around the world are relying on to make travel as safe as possible in 2021 With vaccination levels varying between countries, pre-flight ...

COVID testing for travel can see the cost of holidays sky-rocket. However, according to the CEO of approved testing firm Qured, there are some easy ways to save money. Jetting off on holiday is a very ...

Sliced inverse regression (SIR) and an associated chi-squared test for dimension have been introduced as a method for reducing the dimension of regression problems whose predictor variables are normal ...

British Airways is one of many tour operators that has had to make changes in light of Government announcements last week. Under the new roadmap, international travel is off the cards until May 17 at ...

Furious holidaymakers claim a company contracted by the government to offer pre-flight Covid tests is so slow they've been forced to miss flights. Brits claim to have had holidays "ruined" after the ...

Recall that a chi-squared test of independence can be used for two categorical variables and write down the null hypothesis for this test Explain the basic idea of a chi-squared test, namely that the ...