Chapter 2.1 to 2.5 STAT130 | Baamboozle - Baamboozle

Question 25 📊 What does a positively skewed dataset look like?

✅ Answer: The tail is longer on the right (most values are on the lower end).

Question 24 📊 True or False: A dataset with a higher standard deviation is more spread out.

✅ Answer: True

Question 23 📊 If the range of a dataset is 40 and it has 8 classes, what is the class width?

✅ Answer: 40 ÷ 8 = 5 (always round up if needed)

Question 22 📊 What is the formula for sample variance?

Question 21 📊 What does standard deviation measure?

✅ Answer: How spread out the data is from the mean.

Question 20 📊 What measure of central tendency is best for qualitative data (e.g., survey responses)?

✅ Answer: Mode (It shows the most common category).

Question 19 📊 If the mean = 40 and the median = 30, is the dataset skewed?

✅ Answer: Yes, positively skewed (mean > median means a right-skewed distribution).

Question 18 📊 True or False: The median is affected by extreme values (outliers).

✅ Answer: False (The median is resistant to outliers, unlike the mean.)

Question 17 📊 If you have a bimodal dataset, what does it mean?

✅ Answer: The dataset has two modes (most frequently occurring values).

Question 16 📊 What is the mean of this dataset: 4, 6, 8, 10, 12?

✅ Answer: (4+6+8+10+12) ÷ 5 = 8

Question 15 📊 If the class limits are 10-19, 20-29, 30-39, what are the class midpoints?

✅ Answer: (10+19)/2 = 14.5 (20+29)/2 = 24.5 (30+39)/2 = 34.5

Question 14 📊 How do you calculate class width?

✅ Answer: Range ÷ Number of classes (always round up).

Question 13 📊 What formula is used to determine the number of classes (k) in a frequency distribution? A) Range ÷ 2 B) Sturges’ Rule: k = 1 + 1.44 ln(n) C) (Max + Min) ÷ 2 D) Number of data points ÷ 5

✅ Answer: B) Sturges’ Rule: k = 1 + 1.44 ln(n)

Question 12 📊 If the lowest value in a dataset is 10 and the highest is 50, what is the range?

✅ Answer: 50 - 10 = 40

Question 11 📊 What is a frequency distribution?

✅ Answer: A table that shows how often each value (or range of values) appears in a dataset.

Question 10 📊 What is the standard deviation used for?

✅ Answer: It measures how spread out the data values are from the mean.

Question 9 📊 The range of a dataset is calculated by: A) Adding all values together B) Subtracting the smallest value from the largest C) Finding the most frequent value D) Dividing the sum by the number of values

✅ Answer: B) Subtracting the smallest value from the largest

Question 8 📊 What is the median of this dataset: 12, 14, 15, 16, 18?

✅ Answer: 15 (Middle value when sorted)

Question 7 📊 How do you remove gaps between bars in an Excel histogram? A) Change chart type B) Reduce bar width to 50% C) Set gap width to 0% D) Use a line graph instead

✅ Answer: C) Set gap width to 0%

Question 6 📉 True or False: A histogram is a type of bar chart with gaps between bars.

✅ Answer: False (Histograms have no gaps)

Question 5 📊 What is the formula for the mean (𝑥̄)?

✅ Answer: (Sum of all values) ÷ (Total number of values)

Question 4 🔢 What is the mode of this dataset: 5, 7, 8, 7, 9, 10, 7, 5, 8?

✅ Answer: 7 (It appears the most times)

Question 3 📈 Which bar chart type allows us to compare multiple groups easily? A) Simple Bar Chart B) Stacked Bar Chart C) Compound Bar Chart D) Pie Chart

✅ Answer: C) Compound Bar Chart

Question 2 📉 What does a Pareto chart display? A) Individual and cumulative frequencies B) Only individual frequencies C) The relationship between two variables D) Skewness of data

✅ Answer: A) Individual and cumulative frequencies

Question 1 📊 What type of chart is best for showing trends over time? A) Bar Chart B) Line Graph C) Pie Chart D) Stem-and-Leaf Plot

✅ Answer: B) Line Graph