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What is a random sample?

A set of items drawn from a population

Descriptive statistics

summarize and describe data.

A good way to portray a bivariate relationship is with a

scatter plot

What is the median of the following set of numbers: 3,3,3,4,5,6,7,8,8,9?

5.5

What is the level of measurement of the Celsius temperature scale?

Temperature is measured on the interval scale

A symmetric distribution

has no skew.

What is a sample?

A subset of units - for example, people - drawn from a population, usually intended to represent that population in a study.

Which are other names for the normal distribution?

Gaussian curve, Bell-shaped curve

Strictly speaking, what is the best interpretation of a 95% confidence interval for the mean?

If repeated samples were taken and the 95% confidence interval was computed for each sample, 95% of the intervals would contain the population mean.

What are the mean, median and mode best described as?

Measures of central tendency.

Which of the following is a measure of central tendency?

Mode

You are interested in whether Republican or Democratic voters are more likely to be able to swim. You have two categories, swimmer and non-swimmer, and you allocate the Republicans and Democrats in your sample accordingly. What's your level of measurement?

Nominal.

A researcher is looking at the effect of heat upon the ability to recall items in a list. What is the dependent variable?

The ability to recall items in a list

Which of the following is not true of individuals in the control condition of an experiment?

The correct answer is: They receive, or might receive, the experimental treatment.

What is the range of a distribution?

The distance from the lowest to the highest score.

When does the sampling distribution equal the relative frequency distribution?

The more samples, the closer the relative frequency distribution will come to the sampling distribution.

A researcher is interested in the effects of loud music on learning. A group of 30 students is selected to participate in a research study. The group of students is...?

The sample.

What is the standard error of the mean?

The standard deviation of the sampling distribution of the mean

What is the T-Distribution

The t distribution (aka, Student's t-distribution) is a probability distribution that is used to estimate population parameters when the sample size is small and/or when the population variance is unknown.

Two basic divisions of statistics are

inferential and descriptive.

When the points tend to cluster along a line then the relationship is called a

linear relationship

Which of the following are part(s) of statistics?

numerical calculations, graphs, interpretations and decisions based on the numbers and graphs

Uncertainty regarding conclusions about a population can be eliminated if you

obtain data from all members of the population.

What is a P Value

p-value helps you determine the significance of your results. To test the validity of a Null Hypothesis

When participants who arrive for a research study are put into treatment groups on the basis of chance

random assignment has occurred.

What is a degree of freedom

the number of independent pieces of information that went into calculating the estimate

A grouped frequency distribution should be used instead of a frequency distribution when the

variable is continuous.