Questions and answers by

Lyndyc

Questions (36)

Why is the Rorschach so controversial?
1. 1 answer
2. 522 views
What are two strategies to follow when critically evaluating a study?
1. 1 answer
2. 404 views
For a particular population, a sample of n = 4 scores has an expected value of 10. For the same population, a sample of n = 25
1. 2 answers
2. 2,735 views
A sample from a population with  = 40 and  = 10 has a mean of M = 44. If the sample mean corresponds to a z = 2.00, then
1. 1 answer
2. 2,264 views
True Or FalseUsing the average score to describe a sample is an example of inferential statistics. By reading the definition in
1. 1 answer
2. 1,120 views
True or FalseIf one score is randomly selected from a normal distribution with  = 100 and  = 20, the probability of
1. 2 answers
2. 872 views
True or FalseFor any normal distribution, the proportion corresponding to scores greater than z = +1.00 is exactly equal to the
1. 2 answers
2. 713 views
True or FalseFor a sample with M = 20 and s = 1, a score of X = 17 would be considered an extremely low score.
1. 2 answers
2. 1,107 views
True or FalseA sample mean with a z-score value between 1.00 and +1.00 would be considered a fairly typical, representative
1. 2 answers
2. 478 views
true or falseThe value for the standard deviation cannot be larger than the value for the range.
1. 2 answers
2. 533 views
True or FalseThe class interval of 25-29 has real limits of 24.5 and 29.5.
1. 2 answers
2. 1,347 views
A random sample of n = 4 scores is selected from a population with ƒÝ = 80 and ƒã = 20. On average, how much difference
1. 1 answer
2. 889 views
Last week Tom had exams in Math and in Spanish. He had a score of 45 on the Math exam and a score of 65 on the Spanish exam. For
1. 1 answer
2. 1,386 views
The sum of the squared deviation scores is SS = 20 for a population of N = 5 scores. What is the variance for this population?a.
1. 3 answers
2. 3,319 views
Which of the following is an accurate definition of a Type II error?a. rejecting a false null hypothesis b. rejecting a true
1. 1 answer
2. 2,178 views
What is the consequence of a Type II error?a. concluding that a treatment has an effect when it really does b. concluding that a
1. 1 answer
2. 1,814 views
When is there a risk of a Type II error?a. whenever H0 is rejected b. whenever H1 is rejected c. whenever the decision is "fail
1. 2 answers
2. 1,253 views
Which of the following will increase the power of a statistical test?a. Change ƒÑ from .05 to .01. b. Change from a one-tailed
1. 1 answer
2. 3,482 views
For a population with a mean of µ=60 and standard deviation of Ợ=24, find the z=score corresponding to each of the following
1. 1 answer
2. 1,137 views
If the population standard deviation is Ợ=8, how large a sample is necessary to have a standard error that isa. Less than 4
1. 4 answers
2. 486 views
True or FalseThe mean for a sample of n = 4 scores has a standard error of 5 points. This sample was selected from a population
1. 2 answers
2. 670 views
True or FalseAs sample size increases, the value of the standard error also increases.
1. 3 answers
2. 1,977 views
True or FalseAccording to the central limit theorem, the expected value for a sample mean becomes smaller, approaching zero, as
1. 3 answers
2. 2,502 views
True or FalseIn order for the distribution of sample means to be normal, it must be based on samples of at least n = 30 scores.
1. 1 answer
2. 804 views
True or FalseIf a sample of at least 30 scores is randomly selected from a normal population, the sample mean will be equal to
1. 2 answers
2. 1,100 views
A sample of n = 9 scores is obtained from a population with ƒÝ = 70 and ƒã = 18. If the sample mean is M = 76, then what is
1. 2 answers
2. 1,563 views
How would you find the z-score for the following X=86 and the n=17.
1. 1 answer
2. 368 views
Find the Standard Deviation for this distribution of scores. Then find the z score for X=86. N=1798, 92, 86, 84 , 76, 74 , 72 ,
1. 1 answer
2. 504 views
Draw a vertical line through a normal distribution for each of the following z-score locations. Determine whether the body is on
1. 1 answer
2. 2,234 views
Draw a vertical line through s normal distribution for each of the following z-score locations. Determine whether the tail is on
1. 1 answer
2. 1,165 views
A normal distribution has a mean of ƒÝ = 100 with ƒã = 20. If one score is randomly selected from this distribution, what is
1. 1 answer
2. 1,215 views
True or FalseFor any normal distribution, the proportion in the tail beyond z = 2.00 is p = 0.0228.
1. 2 answers
2. 993 views
True or FalseA jar contains 15 red marbles and 75 blue marbles. If you randomly select a marble from this jar, the probability
1. 1 answer
2. 796 views
True or FalseOne requirement of a random sample is that every individual in the population has an equal chance of being
1. 1 answer
2. 470 views
True or FalseThe value for a probability can never be less than zero, unless you have made a computational error.
1. 1 answer
2. 835 views
True or FalseAll probabilities can be expressed as decimal values ranging from 0 to 1.00.
1. 2 answers
2. 1,106 views