Stat Midterm

Determine whether statement is true or false. A statistic is a measure that describes a population characteristic.

False. A statistic is a measure that describes a sample characteristic.

What is the level of measurement for "Year of birth?"

Interval

What are some benefits of using graphs of frequency distributions?

It can be easier to identify patterns of a data set by looking at a graph of frequency distributions.

What is the level of measurement of "Martial status"?

Nominal

What are some benefits of representing data sets using frequency distributions?

Organizing the data into a frequency distribution can make patterns within the data more evident.

Describe the relationship between quartiles and percentiles.

Quartiles are special cases of percentiles. Q1 is the 25th percentile, Q2 is the 50th, & Q3 is the 75th percentile.

What is the level of measurement for "Change in health"?

Ratio

What is the level of measurement for "Time since last visit"?

Ratio

What is the difference between frequency and cumulative frequency?

Relative frequency of a class is the proportion of the data in that class, while cumulative frequency of a class is the sum of the frequencies of that class and all previous classes.

Determine whether the given variable is a statistic or a parameter. A sample of seniors is selected and it is found that 25% own a television.

Statistic because the value is a numerical measurement describing a characteristic of a sample.

Explain how the complement can be used to find the probability of getting at least one item of a particular type.

The complement of "at least one" is "none". So, the probability at least one item is equal to 1-p(none of the items)

Determine whether the variable is qualitative or quantitive. Explain. Carrying capacities of flatbed trucks.

The variable is quantitative because carrying capacities are numerical measurements.

What is the difference between independent and dependent variable?

Two events are independent when the occurrence of one event does not affect the probability of the occurrence of the other event. Two events are dependent when the occurrence of one event affects the probability of the occurrence of the other event.

Decide whether the graph represents a discrete random variable or a continuous random variable. Does the graph represent a discrete or continuous random​ variable? Choose the correct answer below.

​continuous , because the length of time is a random variable that is uncountable.the length of time is a random variable that is uncountable.

What is the difference between an outcome and an event?

An outcome is the result of a single probability experiment. An event is a set of one or more possible outcomes.

in terms of displaying data, how is a stem-and-leaf plot similar to a dot plot?

both show how data is distributed both can be used to determine specific data entries both can be used to identify unusual data values

What are the two conditions that determine a probability distribution?

is between 0 and 1, inclusive, and the sum of the all the probabilities is 1.

What is discrete probability distribution?

it lists each possible value a random variable can assume, together with its probability