CH 5

For a population with µ = 84 and σ = 4, what is the z-score corresponding to X = 80? a) -1.00 b) +1.00 c) +1.25 d) -1.50

a) -1.00

What is z for the population? X = 34 μ = 26 σ = 4 a) 2 b) 4 c) 8 d) 6

a) 2

For the population, would a score of X = 85 be considered a central score (near the middle of the distribution) or an extreme score (far out in the tail of the distribution)? Mean = 75, standard deviation = 15. a) All of these answers are true. b) Extreme Score c) Central Score d) Average Score

b) Extreme Score

A z-score establishes a relationship between the score, mean, and _____________. Question options: a) standard deviation. b) the range. c) the variance. d) the degrees of freedom.

b) the range.

Which z-score value represents the location farthest from the mean? a) z = +0.50 b) z = -2.00 c) z = -0.50 d) z = -1.00

b) z = -2.00

Question 2 Which z-score corresponds to a score that is above the mean by 2 standard deviations? a) -2 b) +2 c) This is impossible to determine without knowing the value of the standard deviation. d) +10

b) +2

If the mean on an intelligence test is 100, what score indicates an excellent score? Question options: a) 45 b) 100 c) 55 d) 145

b) 100

A large z indicates... Question options: a) a moderate score. b) a non-significant score. c) an extreme score. d) a small score.

c) an extreme score.

Which position in a distribution corresponds to a z-score of z = -1.00? a) below the mean by 1 point b) above the mean by 1 point c) below the mean by 1 standard deviation d) above the mean by 1 standard deviation

c) below the mean by 1 standard deviation

The numerical value of the z-score specifies the distance from the __________. Question options: a) X Score b) standard deviation c) mean d) variance

c) mean

A person scores X = 65 on an exam. Which set of parameters would give this person the worst grade on the exam relative to others? Question options: a) µ = 70 and σ = 10 b) Can't be determined. c) µ = 70 and σ = 5 d) µ = 60 and σ = 10

c) µ = 70 and σ = 5

For a population with µ = 40 and σ = 8, what is the z-score corresponding to X = 34? Question options: a) z = -0.50 b) z = -1.50 c) z = -0.75 d) z = -1.00

c) z = -0.75

Z-scores are useful with regard to inferential statistics primarily because they offer a tool by which to determine whether _____. Question options: a) an individual is different from a sample. b) a distribution of scores is symmetrically shaped. c) a sample is noticeably different from a population. d) a distribution of scores is standardized.

d) a distribution of scores is standardized.

What kind of formula is this? z = X - μ σ a) Melissa Sollom's made up formula b) Sample c) E = MC^2 d) Population

d) Population