WEEK #4 - research method Flashcards
TRUEP OR FALSE
if everything is equal we should expect a normal curve
TRUE
TRUE OR FALSE
computers are better at random generated numbers
FALSE
computers are not good at random generated numbers
what are standard scores ?
indicates how many standard deviations a datum is above or below the population/sample mean
what are standard deviations ?
measure of the amount of variation of a random variable expected about its mean
when are standard scores useful ?
to describe data points on different measures, in terms of a common scale
the following is an example of what ?
“
standard scores
what is the easiest way to compare scores on a common scale ?
to use standard scores
what type of standard scores are most commonly used ?
z score or T score
between a T and z score which is more commonly used to compare scores on a common scale ?
T score
what is the z-score ?
indicates how much a given value differs from the standard deviation
what is the z-distribution ?
- ranges from negative infinity to positive infinity
- has a mean of 0
- has a standard deviation of 1
TRUE OR FALSE
z-scores may NOT be thought of as “standard deviation units”
FALSE
z-scores MAY be thought of as “standard deviation units”
what is the t score ?
another way of standardizing scores by convention and is a standard score (like z), but without negative values
when do we use T-scores ?
to make numbers more valuable as their positive numbers
what are percentiles ?
refers to the proportion scoring less than a particular value
TRUE OR FALSE
we can also express z-scores as percentiles ?
TRUE
where are percentiles obtained by ?
a z-table
what do we obtain from a z-table ?
percentiles
YES OR NO
can we sample a population ?
NO we can’t
what do we look for during sample distribution ?
- pretty close @ random sample
- sample age
- diversity
- sex & gender
what are “alternative hypotheses” ?
alternative explanation from the status quo
what is “research hypotheses” ?
researchers true expectation of results