Question

A probability of 1 is the same as a probability of 100%

The difference between interval and ordinal data is that interval data has a natural zero.

If you are doing a study and the population is Americans, the easiest type of study to run would be a simple random sample.

If your population is 80% female and your sample is 60% male, there is undercoverage bias.

In order to calculate a mean on Excel, we type in "=MEAN".

Answer 1

A probability of 1 is the same as a probability of 100%.

correct/ true.

The range of probability is 0 to 1. In term of percentage i.e fraction of 100, multiply the probability by 100.

Hence probability of 1 is the same as a probability of 100%.

The difference between interval and ordinal data is that interval data has a natural zero.

incorrect/ false.

The interval scale the zero is arbitrary( NO NATURAL ZERO POINT), like zero temperature.It does not mean that there is no temperature. But when interval data have a natural zero point it is a ratio scale.

Ordinal data are defined categories

The main difference between the   interval and ordinal data is that interval data are related to difference of value within two consecutive values, and ordinal data are related to order, rank or categories etc.

If you are doing a study and the population is Americans, the easiest type of study to run would be a simple random sample.

correct/true.

In simple random sampling each unit has an equal probability of getting selected, hence have very little bias.

For a large population like Americans, cluster sampling will be more appropriate (each state will be cluster) but it is time consuming and complex. The easiest way is simple random sampling.

If your population is 80% female and your sample is 60% male, there is undercoverage bias.

correct/ true

Here the proportion of male in sample is representing bias (especially selection bias.). There is lack of enough randomness in selection procedure . Hence there is undercoverage bias.

In order to calculate a mean on Excel, we type in "=MEAN".

Incorrect/false

The function for mean in Excel is "=AVERAGE" and not "=MEAN".Hence   to calculate a mean on Excel, we type in "=AVERAGE".