Consider a dataset A with 55 distinct observations. A new dataset C is created by adding 2023 to all observations in dataset A. Which of the following is NOT true?
(Maximum – Minimum) of C = 2023 + (Maximum – Minimum) of A.
Let dataset A have observations $a_1, a_2, \dots, a_{55}$. The new dataset C is created by adding 2023 to each observation in A. So, dataset C has observations $c_1, c_2, \dots, c_{55}$, where $c_i = a_i + 2023$ for $i = 1, \dots, 55$. We need to analyze how adding a constant like 2023 affects different statistics of the dataset.
The mean of a dataset is the sum of all observations divided by the number of observations.
Mean of A ($\bar{A}$) = $\frac{1}{55} \sum_{i=1}^{55} a_i$
Mean of C ($\bar{C}$) = $\frac{1}{55} \sum_{i=1}^{55} c_i = \frac{1}{55} \sum_{i=1}^{55} (a_i + 2023)$
We can separate the summation:
$\bar{C} = \frac{1}{55} \left( \sum_{i=1}^{55} a_i + \sum_{i=1}^{55} 2023 \right) = \frac{1}{55} \sum_{i=1}^{55} a_i + \frac{1}{55} \sum_{i=1}^{55} 2023$
The first part is the mean of A, and the second part is the sum of 55 times 2023, divided by 55.
$\bar{C} = \bar{A} + \frac{55 \times 2023}{55} = \bar{A} + 2023$
So, Mean of C = 2023 + Mean of A. This statement (Option 1) is true.
Variance measures the spread or dispersion of the dataset around its mean. The variance of A ($\sigma_A^2$) is $\frac{1}{55} \sum_{i=1}^{55} (a_i - \bar{A})^2$.
The variance of C ($\sigma_C^2$) is $\frac{1}{55} \sum_{i=1}^{55} (c_i - \bar{C})^2$.
We know $c_i = a_i + 2023$ and $\bar{C} = \bar{A} + 2023$. Substitute these into the variance formula for C:
$\sigma_C^2 = \frac{1}{55} \sum_{i=1}^{55} ((a_i + 2023) - (\bar{A} + 2023))^2$
Simplify the term inside the parenthesis:
$((a_i + 2023) - (\bar{A} + 2023)) = a_i + 2023 - \bar{A} - 2023 = a_i - \bar{A}$
So, $\sigma_C^2 = \frac{1}{55} \sum_{i=1}^{55} (a_i - \bar{A})^2 = \sigma_A^2$.
Therefore, Variance of C = Variance of A. Adding a constant does not change the variance. This statement (Option 2) is true.
The median is the middle value in a dataset when it is ordered. Since dataset A has 55 distinct observations, we can order them $a_{(1)} < a_{(2)} < \dots < a_{(55)}$. The median of A is the $(55+1)/2 = 28^{\text{th}}$ observation in the ordered list, i.e., $a_{(28)}$.
When we add 2023 to each observation in A to get dataset C, the order is preserved because if $a_i < a_j$, then $a_i + 2023 < a_j + 2023$. So, the ordered observations of C will be $c_{(1)} < c_{(2)} < \dots < c_{(55)}$, where $c_{(i)} = a_{(i)} + 2023$.
The median of C is the $28^{\text{th}}$ observation in the ordered list of C, i.e., $c_{(28)}$.
Median of C = $c_{(28)} = a_{(28)} + 2023$ = Median of A + 2023.
So, Median of C = 2023 + Median of A. This statement (Option 4) is true.
Let Max_A be the maximum value in A and Min_A be the minimum value in A. Since A has distinct observations, Max_A and Min_A are unique values.
When we add 2023 to every observation, the maximum value in C will be Max_C = Max_A + 2023, and the minimum value in C will be Min_C = Min_A + 2023.
The difference between the maximum and minimum values (also known as the range) for dataset C is:
(Maximum – Minimum) of C = Max_C – Min_C = (Max_A + 2023) – (Min_A + 2023)
= Max_A + 2023 – Min_A – 2023 = Max_A – Min_A
This is equal to (Maximum – Minimum) of A.
So, (Maximum – Minimum) of C = (Maximum – Minimum) of A. Adding a constant does not change the range.
The statement in Option 3 is (Maximum – Minimum) of C = 2023 + (Maximum – Minimum) of A. This statement is false because the range is unchanged, not increased by 2023.
Based on the analysis, the statement that is NOT true is (Maximum – Minimum) of C = 2023 + (Maximum – Minimum) of A.
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