13.) In the following dataset: 2, 3, 3, 1, 4. What are the Mean and Standard Deviation (estimate of the population SD)? M = 2.6, SD= .5 M = 2.6, SD=1.14 M = 3, SD=1.87 M = 3.6, SD=.5
13.) In the following dataset: 2, 3, 3, 1, 4. What are the Mean and Standard Deviation (estimate of the population SD)? M = 2.6, SD= .5 M = 2.6, SD=1.14 M = 3, SD=1.87 M = 3.6, SD=.5
13.) In the following dataset: 2, 3, 3, 1, 4. What are the Mean and Standard Deviation (estimate of the population SD)? M = 2.6, SD= .5 M = 2.6, SD=1.14 M = 3, SD=1.87 M = 3.6, SD=.5
13.) In the following dataset: 2, 3, 3, 1, 4. What are the Mean and Standard Deviation (estimate of the population SD)?
M = 2.6, SD= .5
M = 2.6, SD=1.14
M = 3, SD=1.87
M = 3.6, SD=.5
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14.) The following are percentiles associated with Variable X:
5th percentile = 25
10th percentile = 30
25th percentile = 40
50th percentile = 45
75th percentile = 55
90th percentile = 70
What is the value corresponding to the upper fence of a boxplot?
77.5
70
17.5
32.5
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15.) Which of the following corresponds to the power of a study with α = .05 and β = .30?
.7
.95
.8
None of the above
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16.) If I am running a one-sample t-test on a sample of size 25, mean of 4, sd of 2, what are the degrees of freedom?
18
24
19
20
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17.) For a normally-distributed variable with a Mean of 50 and an SD of 10, approximately 95% of the scores will be between the values ________ & ________
30 & 70
2.5 & 95.5
20 & 80
40 & 60
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18.) A researcher is running a one sample t-test. In the reported results, the researcher indicates that the test had 50 degrees of freedom, and a t-value of 1.5. What was N?
19.) In the standard normal model, what is the percentile associated with the value x = 0?
99th
25th
50th
75th
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20.) What are the approximate critical values for a two-sided t-test (alpha = .05) with an N = 1000000
-1.96 & 1.96
-0.05 & 0.05
-2 & 2
Cannot know because the value is not included in the t-table
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21.) Jude scored a 56 in an exam. The Mean for the class was 50 and the standard deviation was 5. Which of the following best describes Jude's score relative to the rest of the class?
11.5% of students scored higher than Jude
88.5% of students scored higher than Jude
55% of students scored lower than Jude
Jude's score is an outlier
Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.
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