Statistics Quiz

The weight of objects in kilograms, which cannot be negative, is measured on which scale?

• Ordinal

• Nominal

• Ratio

• Interval

What is the null hypothesis (H₀)?

• A claim about the sample.

• A claim about the mean of the population.

• A claim to be tested or rejected.

• A statement of effect or difference.

What is the difference between a one-tailed and a two-tailed test in hypothesis testing?

• A one-tailed test is always more accurate than a two-tailed test.

• A one-tailed test is only used when the null hypothesis is true, while a two-tailed test is used for alternative hypotheses.

• A one-tailed test evaluates the effect in one specific direction, while a two-tailed test evaluates the effect in both directions.

• A one-tailed test uses a higher confidence level than a two-tailed test.

Why might a researcher increase the sample size?

• To increase statistical power and significance.

• To increase the standard deviation.

• To reject the null hypothesis.

• To decrease confidence intervals.

What is a confidence interval in statistics?

• A single point estimate of a population mean.

• An interval within which the true population parameter is expected to fall with a certain probability.

• The range between two-point estimates.

• A method to calculate the population standard deviation.

What does statistics focus on?

• Explaining relationships and making predictions.

• Gathering unrelated data.

• Ignoring future trends.

• Avoiding complex data.

What does a population in statistics represent?

• The entire group of the study.

• Only numerical data.

• A sample size.

• A subset of data.

How is the class interval determined in frequency distribution?

• Subtracting the lower limit of one class from the next higher class.

• Multiplying the midpoints.

• Dividing the total frequency by the number of classes.

• Adding the upper and lower boundaries.

A company in Kuching, Sarawak, intends to survey its employees to assess their job satisfaction. The HR department has divided the company into several groups based on office locations and then selected all employees from one of the office locations for the survey. Identify the type of sampling technique used.

• Stratified Random Sampling

• Systematic Sampling

• Simple Random Sampling

• Cluster Sampling

Which of the following is TRUE about quota sampling?

• It is based on predetermined categories.

• It always ensures unbiased results.

• It cannot represent subgroups.

• It uses random selection.