SOC 305 EXAM 2 CHAE
true
a researcher will have more confidence that the sample mean estimates the unknown population mean when the sample size is larger
true
an important use of the probability distribution is that they enable a researcher to make a decision about the relationship between 2 variable that are tested empirircally in a situation of uncertainty
confidence interval
the margin of error around the point estimate that consists of a range of values in to which the population value falls
probability
the number of times a specific event can occur relative to the total number of times that any event can occur
interquartile range
the range of the middle 50% of scores in a data set
Z distribution
used for a sample size smaller then 30
true
when a researcher says they are 99% confident they are saying that the population mean will not fall within the confidence interval 1% of the time
true
when an event is an independent event, its occurrence does not affect nor is it affected by another events occurance
true
when calculating the confidence interval for a small sample the T distribution is utilized the obtain the critical value
population mean
U (meu)
sample mean
X bar
Central Limit Theorem
an infinite number of random samples of size n are drawn from any population with mean and standard deviation, then as the sample size becomes larger, the sampling distribution of sample means will approach normality even if the population distribution is not normally distributed
increases
as a sample size ___________________ the SD of the sampling distribution decreases indication that the sample means cluster more tightly around the population mean
a binomial distribution has a variable that
consists of 2 categories
false
given a continuous x score that is 1.95 SD from the mean, one would conclude that this would be a rare or unusual event
false
if 2 different sets of data have the same range the variability for both sets has to be the same
false
if the sample size is larger then 120 the T distribution is used instead of the Z distribution
true
if the variance has to be calculated the researcher then only needs to take the square root of it to find the standard deviation
measures of dispersion aka variability
measures that capture differences within a variable.
usual
1.99 (usual or unusual)
unusual
2.01 (usual or unusual)
Lance loves you and knows you will do wondful
4-8-2019
true
99% of scores fall between 3 and -3 SD from the mean
true
a researcher wants to understand the probability of jury verdicts. this is an example of a variable that would be considered a binomial variable (guilty VS not guilty)
N
number of trials or sample size
true
point estimates are the estimate of the mean and proportion we obtain from a sample
P
probability of a successful outcome in a SINGLE trial
false
researcher prefer to report the variance instead of the standard deviation because it is easier to interpret and understand
true
the 99% confidence interval will be wider then the 95% confidence interval
variance
the average squared difference of each score in a set of scores from the mean of those scores
point estimates
the estimates of the mean and proportion that are obtained from a sample are referred to as _______________ of the same values in the population
false
the greater magnitude of the variance the less disperse the data are
true
the greater magnitude of the variance the more disperse the data are