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# Statistics (Social And Behavioral Sciences) MCQ

### Multiplying or dividing each score using the same constant will change the standard deviation.

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### For normal distributions, 95% of data will fall within two standard deviations of the mean.

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### The definitional formula for the standard deviation requires that you know the value of the mean.

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### The variance is the best estimate of variability since it takes into account all values except the mean.

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### The range takes into consideration only two values regardless of the number of scores in a distribution.

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### A researcher records the number of songs played by a station in one hour on weekdays, with commercial interruptions. In his study, he found that the average number of songs played, the M = 16, and standard deviation = 3. Assuming the data are normally distributed, which of the following is an appropriate conclusion?

Correct Answer: During weekdays 95% of the time, the station played between 22 and 10 songs per hour.

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### Using the computational formula to compute SS for a specific array of values, Σx = 31 and Σx2 = 267. If this is a sample of 4 scores, then what would SS equal using the definitional formula?

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### Using the computational formula to compute SS for a specific array of values, Σx = 31 and Σx2 = 267. If this is a sample of 4 scores, then what would SS equal using the definitional formula?

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### The only difference in computing sample and population variance is that the SS is divided by ______ for the sample variance.

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### The SS in two similar experiments was found to be 104. Experiment 1 had 10 participants and experiment 2 had 20 participants. Which experiment is associated with the largest variance?

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### The variance and standard deviation can only be:

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### A psychologist records the time in seconds it takes a sample of children to complete a set of problems and computes the SS = 1600. Assuming that the psychologist observed a sample of 25 children in this study, what is the variance and standard deviation for these data?

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### A swimmer measures the time it takes for each of his laps and determines that a time of 15 s is at the 25th percentile, a score of 17 s is at the 50th percentile, and a score of 21 s is at the 75th percentile. What is the interquartile range (IQR) for these data?

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### The interquartile range (IQR) is the range of a distribution of scores:

Correct Answer: After the top 25% and bottom 25% of the scores in that distribution are remove

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### Which of the following distributions has the smallest variability?

Correct Answer: Scores: 2, 3, 4, 5, and 6

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### A researcher records the following data: 10, 10, 10, 10, and 10. How would you describe the variability of these data?

Correct Answer: It is equal to zero because scores are the same.

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### Which of the following is not a symbol used with populations?

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### A measure of variability for the average squared distance that scores deviate from their mean is known as_____

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### The example of variability includes_____

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### The example of variability includes_____

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### Upper Quartile is the median value of the upper half of a data set at the _____ percentile of a distribution.

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### Unbiased Estimator is any sample statistic obtained from a randomly selected sample that does not equals the value of its respective population parameter.

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### Sum Of Squares is the _____ of scores from their mean.

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### Sum Of Squares is the _____ of scores from their mean.

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### Standard Deviation is also known as_____

Correct Answer: Root Mean Square Deviation

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### Standard Deviation is also known as_____

Correct Answer: Root Mean Square Deviation

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### A measure of_____ between the upper quartile (Q3) and lower quartile (Q1) of a data set is known as Semi-Interquartile Range.

Correct Answer: Half of the distance

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### A measure of_____ between the upper quartile (Q3) and lower quartile (Q1) of a data set is known as Semi-Interquartile Range.

Correct Answer: Half of the distance

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### Sample Variance is computed when only a portion or sample of data is measured in a population.

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### Sample Standard Deviation Is calculated by taking the square root of the_____

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### Root Mean Square Deviation is calculated by taking the _____of the variance.

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### A way to calculate the population variance and the sample variance without needing to sum the squared differences of scores from their mean to compute the SS in the numerator is known as Raw Score Method For Variance.

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### The difference between the largest (L) and the smallest value (S) in a data set is known as_____

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### Quartiles divide data evenly into _____ equal parts.

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### Quartile Deviation is computed by dividing the IQR in_____

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### Population Variance is computed when all scores in a given population are unknown.

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### Population Standard Deviation is measured by taking the _____ of the population variance.

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### Percentiles divide a set of data into _____ equal parts.

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### Median Quartile is the median value of a data set at the _____ percentile of a distribution.

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### Median is the _____ value in a distribution of data listed in numeric order.

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### Lower Quartile is the median value of the lower half of a data set at the _____ percentile of a distribution.

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### Lower Quartile is the median value of the lower half of a data set at the _____ percentile of a distribution.

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### Interquartile Range is the range of values between the Q3 and lower Q1 quartiles of a data set.

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### _____ is an example of Fractiles.

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### Empirical Rule states that for data that are normally distributed, at least 68% of data lie within _____ standard deviation of the mean.

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### Empirical Rule states that for data that are normally distributed, at least _____% of data lie within two standard deviations of the mean.

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### Empirical Rule states that for data that are normally distributed, at least _____% of data lie within three standard deviations of the mean.

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### Deviation is denoted by _____ for a sample.

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### Deviation is denoted by _____ for a population.

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### Degree Of Freedom is represented as _____

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### DEfinitional Formula For Variance requires summing the _____ of scores from their mean to compute the SS in the numerator.

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### Deciles divide a set of data into_____equal parts.

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### Computational Formula For Variance is a way to calculate_____ without needing to sum the squared differences of scores from their mean to compute the SS in the numerator.

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