Ap Stats Summer(part 5)

Question 1

How do you find relative frequency?

Answer 1

divide frequency by TOTAL…

Question 2

What is meant by cumulative frequency?

Answer 2

Adding up the frequencies as they occur(such as 10 in 1st minute, 5 in 2nd minute(15) and 7 in the 3rd minute(22)

Question 3

what is relative cumulative frequency

Answer 3

Added up percentages of frequencies

Question 4

What is the difference between a bar chart and a histogram

Answer 4

bar charts are for categorical data (bars don’t touch) and histograms are for quantitative data (bars touch)

Question 5

What is the mean?

Answer 5

Calculated average for data, balancing point of the histogram

Question 6

What is the difference between a population mean and a sample mean?

Answer 6

population mean is the mean of a population, it is a parameter, sample mean is a mean of a sample, so it is a statistic. We use sample statistics to make inferences about population parameters.

Question 7

What symbols do we use for population mean and sample mean?

Answer 7

Mu for population mean (parameter), x-bar ̅ for sample mean (statistic)

Question 8

Difference between mean and median on a histogram

Answer 8

mean is balancing point of histogram, median splits the area of the histogram in half.

Question 9

What is the median?

Answer 9

the middlest number, it splits area in half (always in the POSITION (n+1)/2 )

Question 10

What is the mode?

Answer 10

the most common data value, or the peaks of a histogram. We often use mode with categorical data