*BE SURE TO SHOW YOUR WORK. 1) A psychologist is studying children's aggression in different play areas. She trains observers to rate children's aggression on a scale from 1 (low) to 10 (high), then has them observe preschool children randomly assigned to in either the art or block play areas of the classroom. She obtains the following results: Art area (n=6) x-x(x-x)² Block area (n=6) x-x (x-x)² 1-3 = -2 6-5 = 1 1 4-3 = 1 5-5 0 0 4-3 = 1 3-5 4 4-3 = 1 5-5 0 2-3 = -1 6-5 3-3 = 0 5-5 Σ = 18 Σ = 30 (X-X)² N-1 x=3.0 4 1 1 1 1 0 = (x-x) =8 = = -2 = ON = 0 1 = 0 x=5.0 1 0 =(x-x)=6
*BE SURE TO SHOW YOUR WORK. 1) A psychologist is studying children's aggression in different play areas. She trains observers to rate children's aggression on a scale from 1 (low) to 10 (high), then has them observe preschool children randomly assigned to in either the art or block play areas of the classroom. She obtains the following results: Art area (n=6) x-x(x-x)² Block area (n=6) x-x (x-x)² 1-3 = -2 6-5 = 1 1 4-3 = 1 5-5 0 0 4-3 = 1 3-5 4 4-3 = 1 5-5 0 2-3 = -1 6-5 3-3 = 0 5-5 Σ = 18 Σ = 30 (X-X)² N-1 x=3.0 4 1 1 1 1 0 = (x-x) =8 = = -2 = ON = 0 1 = 0 x=5.0 1 0 =(x-x)=6
*BE SURE TO SHOW YOUR WORK. 1) A psychologist is studying children's aggression in different play areas. She trains observers to rate children's aggression on a scale from 1 (low) to 10 (high), then has them observe preschool children randomly assigned to in either the art or block play areas of the classroom. She obtains the following results: Art area (n=6) x-x(x-x)² Block area (n=6) x-x (x-x)² 1-3 = -2 6-5 = 1 1 4-3 = 1 5-5 0 0 4-3 = 1 3-5 4 4-3 = 1 5-5 0 2-3 = -1 6-5 3-3 = 0 5-5 Σ = 18 Σ = 30 (X-X)² N-1 x=3.0 4 1 1 1 1 0 = (x-x) =8 = = -2 = ON = 0 1 = 0 x=5.0 1 0 =(x-x)=6
la) compute the mean, variance, and standard deviation for each group.
1b) Compute a t-test to see whether the block area results in significantly higher aggression.
Definition Definition Measure of central tendency that is the average of a given data set. The mean value is evaluated as the quotient of the sum of all observations by the sample size. The mean, in contrast to a median, is affected by extreme values. Very large or very small values can distract the mean from the center of the data. Arithmetic mean: The most common type of mean is the arithmetic mean. It is evaluated using the formula: μ = 1 N ∑ i = 1 N x i Other types of means are the geometric mean, logarithmic mean, and harmonic mean. Geometric mean: The nth root of the product of n observations from a data set is defined as the geometric mean of the set: G = x 1 x 2 ... x n n Logarithmic mean: The difference of the natural logarithms of the two numbers, divided by the difference between the numbers is the logarithmic mean of the two numbers. The logarithmic mean is used particularly in heat transfer and mass transfer. ln x 2 − ln x 1 x 2 − x 1 Harmonic mean: The inverse of the arithmetic mean of the inverses of all the numbers in a data set is the harmonic mean of the data. 1 1 x 1 + 1 x 2 + ...
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