Standard Deviation Quiz

What is the primary purpose of calculating Standard Deviation?

• To find the average

• To measure data spread

• To determine the highest value

• To calculate the total sum

What does the symbol μ represent in the context of standard deviation?

• Standard deviation

• Number of data points

• Mean (average)

• Data points

What does the expression (xi - μ) represent?

• The mean

• The deviation of a data point from the mean

• The sum of squared deviations

• The standard deviation

What is the final step in calculating the standard deviation after finding the variance?

• Take the square root of the variance

• Multiply the variance by the mean

• Add the variance to the mean

• Subtract the variance from the mean

What is the mark range for no response attempted according to the AO1 criteria?

• 6-5

• 4-3

• 2-1

• 0

Why do you divide by N - 1 instead of N in the standard deviation calculation?

• To adjust for bias in the sample.

• To increase the standard deviation.

• To decrease the mean.

• To simplify the calculation.

What does a high p-value (> 0.05) suggest about the results?

• Results are statistically significant

• Results are not statistically significant

• Results are conclusive

• Results are definitive

What does a p-value represent?

• The probability of the null hypothesis being true

• The probability of obtaining a result as extreme as the observed result

• The probability of the alternative hypothesis being true

• The probability of the study being valid

What is the implication of a statistically significant result?

• The null hypothesis is accepted

• The null hypothesis is rejected

• The study is invalid

• The results are inconclusive

How is the p-value used in determining statistical significance?

• By comparing it to a threshold value

• By calculating the sample size

• By determining the study's validity

• By assessing the researcher's bias