Which of the following statements about z-scores is NOT true?

Z-scores cannot be calculated for Populations, only Samples

A sampling distribution of the mean for random samples of n=5 from a given population is a

theoretical distribution of means of all possible n=5 sample

Increasing the sample size of an opinion poll will reduce the…

variability of the estimates made from the poll data

studbud

Week 5: Sampling Distribution

12 termsStudBud Administration714 plays

#samplingdistribution

Flashcards12 cardsFPractice quizPHost liveL

Questions 12

Answers

1
The standard deviation of a sampling distribution of the mean is called the
deviated error
statistical deviant, a calculator-carrying suspicious dude
standard error of the mean
standard deviation of the mean
2
Which of the following statements about z-scores is NOT true?
The mean has a z-score of 0
Z-score is the number of SDs the score lies from the mean
Can compare scores drawn from different normal distributions
Z-scores cannot be calculated for Populations, only Samples
3
What is the salary of a psychologist with z=2.5, μ=$70,000, σ=$12,000? Hint: z=(X-μ)/σ
$40,000
$82,000
$94,000
$100,000
4
What is the standard deviation of the SAT Math Population distribution? (Graph appears shortly)
√100
100
There is not enough information to calculate the SD
460
5
A sampling distribution of the mean for random samples of n=5 from a given population is a
theoretical distribution of means of all possible n=5 sample
theoretical distribution of every score from the population
observed distribution of scores from a single n=5 sample
outlier
6
Increasing the sample size of an opinion poll will reduce the…
variability of opinions in the population
variability of opinions in the sample
variability of the estimates made from the poll data
bias of the estimates made from the poll data
7
The author of this quiz studied statistics from 1992 - 94. What didn’t she do during this time?
Watched Natural Born Killers
Listened to Hits from the Bong, Cypress Hill
Neglected statistics
Wore flannelette shirts and ripped jeans
8
Calculate estimate of the SD for the population? (Sample n = 10,X = 68,SS = 36)
4
3.6
6.8
2
9
Am I keeping up in PSYC123?
Yup!
Almost
Not quite...
Throw me a lifesaver!!!
10
To calculate an estimate of the population variance based on sample data, we use...
s2 = SS/N
ŝ = √ŝ2
s = SS/N
ŝ2 = SS/N-1
11
In a normal distribution, what % of scores fall within +/- 2 standard deviations of the mean?
68%
99.7%
90%
95%
12
What is the z-score when X=60, μ=100, σ=15 Hint: z=(X-μ)/σ
-2.67
2
2.67
-2.42

Week 5: Sampling Distribution Flashcards | StudBud