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WGU Applied Probability and Statistics (FZO1 C955) Sample Questions (Q46-Q51):
NEW QUESTION # 46
If y = #4, evaluate the following expression:
(20 # y)/(5 + y)
- A. 0
- B. 1
- C. #6
- D. 2
Answer: A
Explanation:
To evaluate the expression, substitute y = #4 everywhere y appears. The numerator is 20 # y, so replacing y with #4 gives 20 # (#4). Subtracting a negative is equivalent to addition, so the numerator becomes 24. The denominator is 5 + y, so substituting #4 gives 5 + (#4) = 1. The expression therefore becomes 24/1, which equals 24. The correct answer is D. The most common error in this problem is mishandling the negative sign in the numerator. If a student incorrectly computes 20 # (#4) as 16, the resulting value would not match the correct algebraic structure. Another important check is that the denominator is not zero; here it equals 1, so the expression is defined. References/topics from the Study Guide: substitution, evaluating algebraic expressions, integers, order of operations.
NEW QUESTION # 47
Which measure of central tendency is least affected by outliers?
- A. Median
- B. Mode
- C. Range
- D. Mean
Answer: A
Explanation:
The median is the measure of central tendency least affected by outliers because it depends only on the ordered position of values, not on the numerical magnitude of extreme observations. To find the median, the data are arranged from least to greatest and the middle value is identified, or the average of the two middle values is taken when the sample size is even. If an extremely large or extremely small value is added to a data set, the mean can shift substantially because every value contributes to the arithmetic average. The median, however, usually remains stable unless the extreme value changes the middle position. The mode is also not directly affected by magnitude, but it may be absent or non-unique and is often less informative for numerical data. Range is not a measure of central tendency and is highly sensitive to outliers because it uses the minimum and maximum. Study Guide references/topics: descriptive statistics, measures of center, median, resistance to outliers.
NEW QUESTION # 48
There are 20 men in a room whose heights are reflected in inches as 68, 70, 73, 67, 71, 68, 76, 70, 73, 66, 68,
69, 71, 74, 73, 72, 65, 60, 70, and 78 inches respectively.
What is the median of these data?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: D
Explanation:
The median is the middle value of an ordered data set. Because there are 20 observations, the number of data values is even, so the median is the average of the 10th and 11th values after the data are arranged from least to greatest. Ordering the heights gives 60, 65, 66, 67, 68, 68, 68, 69, 70, 70, 70, 71, 71, 72, 73, 73, 73, 74, 76,
78. The 10th value is 70, and the 11th value is also 70. The median is therefore (70 + 70) ÷ 2 = 70. This value divides the ordered heights into two equal halves: ten values are at or below 70, and ten values are at or above
70. The median is resistant to extreme values, so the low value 60 and the high value 78 do not distort it the way they could affect the mean. References/topics from the Study Guide: median, ordered data, measures of center, quantitative data.
NEW QUESTION # 49
Regression R² = 0.64. Interpretation?
- A. Slope = 0.64
- B. Correlation = 0.64
- C. 64% chance of prediction
- D. 64% of variation in Y explained by X
Answer: D
Explanation:
The coefficient of determination, R², measures the proportion of variability in the response variable Y that is explained by the regression model using explanatory variable X. If R² = 0.64, then 64% of the variation in Y is explained by its linear relationship with X. The remaining 36% is unexplained by the model and may reflect other variables, random variation, measurement error, or nonlinear patterns. Option B is incorrect because R² is not the same as correlation. In simple linear regression, correlation r would be either +0.8 or #0.8, depending on the slope direction, because r² = 0.64. Option C is incorrect because the slope measures change in Y per one-unit change in X, not explained variation. Option D is incorrect because R² is not a probability of making a correct prediction. It is a proportion of variation accounted for by the model. Study Guide references
/topics: regression, coefficient of determination, explained variation, linear modeling.
NEW QUESTION # 50
Sample mean = 40, SD = 8, n = 16. Standard error = ?
- A. 0.5
- B. 0
- C. 1
- D. 2
Answer: C
Explanation:
The standard error of the sample mean is calculated as SE = s/#n, where s is the sample standard deviation and n is the sample size. Here, the standard deviation is 8 and the sample size is 16. The square root of 16 is 4, so SE = 8/4 = 2. The sample mean of 40 is not used directly in the standard error formula; it identifies the center of the sample, not the variability of the sample mean across repeated samples. Option B, 8, is the standard deviation, not the standard error. Option D, 4, is the square root of the sample size. Option C, 0.5, would result from an incorrect calculation. Standard error decreases as sample size increases because larger samples provide more precise estimates. Study Guide references/topics: standard error, standard deviation, sample size, sampling distribution.
NEW QUESTION # 51
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