frequencies associated to numerical variables

counts associated to dependent variables

frequencies associated to categorical variables

counts associated to independent variables

1.318

1.960

1.711

1.703

2.000

dispersion of the population mean

dispersion of a sample

dispersion of the sample means

dispersion of the population

decrease the confidence level to 1 month.

take a new sample of 25 patients.

decrease the precision to 1 month.

take a new sample of 400 patients.

FALSE

TRUE

The chances that the null hypothesis is true changes from 0.01 to 0.05.

The test becomes less stringent to reject the null hypothesis.

The chances of committing a Type II error changes from 0.05 to 0.01.

The chances of committing a Type I error changes from 0.05 to 0.01.

The test becomes more stringent to reject the null hypothesis.

you would commit a Type I error if the null was true.

you would commit a Type I error if the null was false.

you would commit a Type II error if the null was false.

you would commit a Type II error if the null was true.