Midterm

A company surveys employees about preferred work schedules: 40% prefer 9–5, 35% prefer flexible hours, and 25% prefer remote work. Which graph best represents this data?

• Histogram
• Pie chart
• Boxplot
• Frequency distribution table

A sample of 50 employees is drawn from a population of 500. Which statement is correct?

• The sample is the population
• A statistic is computed from the sample
• A parameter is computed from the sample
• The sample must be larger than 50

Which of the following is an example of ordinal data?

• Income in dollars
• Letter grades (A, B, C)
• Number of products sold
• Eye color

A frequency distribution table is used to determine:

• Mean
• Median and mode
• Variance
• Standard deviation

In a distribution that is skewed to the left, which of the following statements is most likely true?

• Mean < Median

• Mean ≈ Median

• Mean > Median

• Median > Minimum

Which level of measurement allows ratios and a true zero?

• Nominal
• Ordinal
• Interval
• Ratio

The difference between descriptive and inferential statistics is:

• Descriptive summarizes data; inferential makes predictions from samples
• Descriptive uses samples; inferential uses populations
• Descriptive is always numerical; inferential is always graphical
• They are the same

Emily recorded the ages of her classmates: 5, 7, 9, 9, 11, 13. What is the variance?

• 7.2

• 6.5

• 8

• 7.8

If two datasets have the same mean but different standard deviations, which statement is true?

• Both datasets are equally spread
• The dataset with higher SD has more variability
• Mean measures spread
• SD does not measure variability

Which measure of central tendency is least affected by extreme values?

• Mean
• Median
• Mode
• Variance