Which feature is unique to histograms compared to dotplots and stemplots?

The average age of the mathematics teachers is $$39$$ years. If each teacher's age is increased by 10% (for example, as a theoretical adjustment), what is the new average age?

Which of the following is an example of identifying skewness in a distribution?

Two different normal distributions have the same mean but different standard deviations (σ₁ and σ₂, where σ₁ < σ₂). If a value has the same z-score in both distributions, which statement must be true?

Using the salary table above, if every employee's salary is increased by $$3000$$, what is the effect on the variance of the salaries?

For a dataset with n = 8, the sum of squared deviations from the mean is 112. If all values in the dataset are increased by 5, which of the following statements is true?

I. The tallest bar in the histogram corresponds to seniors taking two AP classes. II. The relative frequency for seniors taking three AP classes is approximately 300/2200 (about 0.14), which is greater than 0.10. III. Fewer seniors take four AP classes than take zero AP classes. Based on the above data, which of the above statements is/are true?

A data set has a distribution that is strongly right-skewed with several extreme outliers. Which of the following statements is most accurate regarding measures of center?

All of the following statements regarding the effects of a $3000 increase and a 10% raise on employee salaries are true except:

A data set contains the following variables about patients: blood type, heart rate (beats per minute), satisfaction rating (1-5 scale), and diagnosis code. For which variable would calculating the mean provide statistically meaningful information?

All of the following statements about the empirical rule in a normal distribution are true except:

A dataset has a first quartile (Q1) of 15, a third quartile (Q3) of 35, and a minimum value of 5. What is the smallest value that would be considered an outlier on the low end?

After computing the relative frequencies in a survey, a researcher rounded each percentage separately. This rounding caused the summed percentages to exceed 100%. What mistake did the researcher make during the rounding process?

A survey shows 60% of respondents prefer tea. What is this relative frequency as a decimal?

What term describes the variability or dispersion of a distribution?

All of the following statements about the back-to-back stemplot comparing NBA team wins in the Eastern and Western Conferences are true except:

What is the primary purpose of a relative frequency table?

Consider a histogram displaying the following segments: 20% of the area lies between $$z = -2$$ and $$z = -1$$, 40% between $$z = -1$$ and $$z = 0$$, 10% between $$z = 0$$ and $$z = 1$$, and 30% between $$z = 1$$ and $$z = 2$$. Which of the following is true?

A researcher finds that the weights of adult male gorillas are normally distributed with mean μ = 180 kg and standard deviation σ = 21 kg. If a male gorilla weighs 201 kg, which of the following best describes its position in the distribution?