Statistical Studies, Methods of Sampling, and Statistical Questions

If a z-score calculator shows a value of 1.5 for a data point, what does this indicate about its position in the distribution?

• It is 1.5 standard deviations below the mean

• It is at the mean

• It is 1.5 standard deviations above the mean

• It is exactly at the 75th percentile

What is a crucial aspect to consider when assessing the statistical measures used in a study?

• The aesthetic appeal of the graphs

• The use of the most recently developed statistical tests

• The appropriateness of the measures for the data type and research questions

• The number of decimal places used in reporting results

A random selection of people are called every morning for a week to determine if television shows are too violent. 

• Census

• Sample Survey

• Experiment

• Observational Study

What is a Simple Random Sample?

• A sample where each member of the population is equally likely to be chosen.

• A sample where only selected members are chosen.

• A sample where members are chosen based on preference.

• A sample where no members are chosen.

A teacher wants to know the average time spent doing homework by the students in her class of 20 girls and 5 boys.

She picks the student in every 5th seat.

• Simple Random

• Systematic

• voluntary response

• convenience

Larger samples have larger sampling errors

• True

• False

Probability samples

• allow each element an equal chance of selection

• are part of all sampling processes

• do not exist

• allow weighted samples

This type of sampling is based on proportional representation

• Cluster Sampling

• Systematic Sampling

• Stratified Sampling

• Simple Random Sampling