A clinical psychologist posits that drug use leads to conduct problems. To test this, he examines whether his adolescent inpatient drug users were elevated in terms of conduct disorder (CD). A sample of 100 was evaluated using a standard measure of CD; they had a mean score of 53. The population mean (µ) for the CD scale is 50 with a standard deviation (σ) of 10. Show calculations for the appropriate test.What are the null and alternative hypotheses? What inferential test did you use? Using an alpha level of .05, determine whether the sample was significantly different from population. Report and interpret an effect size. Given your conclusion in part b, what type of error might you be making? A forensic psychologist is interested in testing whether serial killers are more introverted thanthe general population. A sample of 16 serial killers serving life sentences was tested and foundto have a sample mean introversion score of 41 and a standard deviation (s) of 10. Thepopulation mean (µ) for introversion is 36. Show calculations for the appropriate testa. What are the null and alternative hypotheses?b. What significance test did you use? Using an alpha level of .05, determine whether thesample was significantly different from population.c. Report and interpret an effect size.d. Given your conclusion in part b, what type of error might you be making? 1. A clinical psychologist posits that drug use leads to conduct problems. To test this, he examineswhether his adolescent inpatient drug users were elevated in terms of conduct disorder (CD). Asample of 100 was evaluated using a standard measure of CD; they had a mean score of 53. Thepopulation mean (µ) for the CD scale is 50 with a standard deviation (6) of 10. Showcalculations for the appropriate test.What are the null and alternative hypotheses?а.b. What inferential test did you use? Using an alpha level of .05, determine whether thesample was significantly different from population.c. Report and interpret an effect size.d. Given your conclusion in part b, what type of error might you be making?

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A clinical psychologist posits that drug use leads to conduct problems. To test this, he examines whether his adolescent inpatient drug users were elevated in terms of conduct disorder (CD). A sample of 100 was evaluated using a standard measure of CD; they had a mean score of 53. The population mean (µ) for the CD scale is 50 with a standard deviation (σ) of 10. Show calculations for the appropriate test.

A forensic psychologist is interested in testing whether serial killers are more introverted than
the general population. A sample of 16 serial killers serving life sentences was tested and found
to have a sample mean introversion score of 41 and a standard deviation (s) of 10. The
population mean (µ) for introversion is 36. Show calculations for the appropriate test
a. What are the null and alternative hypotheses?
b. What significance test did you use? Using an alpha level of .05, determine whether the
sample was significantly different from population.
c. Report and interpret an effect size.
d. Given your conclusion in part b, what type of error might you be making?

1. A clinical psychologist posits that drug use leads to conduct problems. To test this, he examines
whether his adolescent inpatient drug users were elevated in terms of conduct disorder (CD). A
sample of 100 was evaluated using a standard measure of CD; they had a mean score of 53. The
population mean (µ) for the CD scale is 50 with a standard deviation (6) of 10. Show
calculations for the appropriate test.
What are the null and alternative hypotheses?
а.
b. What inferential test did you use? Using an alpha level of .05, determine whether the
sample was significantly different from population.
c. Report and interpret an effect size.
d. Given your conclusion in part b, what type of error might you be making?

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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