Statistics for Business Assessment

What is the mean of the following numbers: 2, 4, 6, 8, 10?

• 8

• 6

• 10

• 4

Which of the following is a measure of central tendency?

• Mean, median, or mode

• Standard deviation

• Variance

• Range

In a normal distribution, what percentage of data falls within one standard deviation of the mean?

• 95%

• 34%

• 50%

• 68%

What is the purpose of a hypothesis test in statistics?

• To identify the mode of a dataset.

• To determine if there is enough evidence to support a specific claim about a population.

• To summarize data in a visual format.

• To calculate the mean of a sample.

Which of the following represents a population?

• All adult women in a city

• All men in the world

• All children in a school

• All adult men in a city

What is the difference between a sample and a population?

• A sample is a subset of a population.

• A sample is a random selection of unrelated items.

• A sample is always larger than the population.

• A sample includes the entire population.

What does a p-value indicate in hypothesis testing?

• The p-value measures the probability of the null hypothesis being true.

• The p-value indicates the sample size used in the test.

• The p-value shows the exact value of the test statistic.

• The p-value indicates the strength of evidence against the null hypothesis.

Which graph is best for displaying the distribution of a dataset?

• Line Graph

• Scatter Plot

• Pie Chart

• Histogram

What is the formula for calculating the variance of a dataset?

• Variance = (Σxi)² / n

• Variance = (Σ(xi + μ)²) / n

• Variance = (Σ(xi - μ)²) / n for population, or (Σ(xi - x̄)²) / (n - 1) for sample.

• Variance = Σ(xi - μ) / n

In statistics, what does 'correlation' measure?

• Correlation indicates the cause of one variable affecting another.

• Correlation measures the average of two variables.

• Correlation is the measure of the total number of variables in a dataset.

• Correlation measures the relationship between two variables.