Data collection and sampling methods
A sampling method where the sample is easy to access/reach
convenience sampling
How do you calculate the mean?
sum of data points / number of total data points
what does "stem" mean in stem and leaf plot?
The first few digits (apart from the units digit) in a number/s.
what is the basic probability formula?
number of successful outcomes/ total number of outcomes
What data collection method involves comparing the outcomes of two groups
experiment
Is positively skewed data bunched to the left of the graph or the right?
left
Are dot plots or stem and leaf plots better to use for data with a large range?
stem and leaf plots
The probability of James being late for school is 0.1. How would you write out the formula to calculate the probability of James not being late for school?
0.1 + Pr(not late) = 1
A researcher randomly selects 10 students from each year level to provide feedback on the new canteen menu. What sampling method is this
stratified sampling
Would using the mean or median be better in this scenario: finding the average household income in Australia
median
If the stem is '3' and the leaves are '1' , '5' and '9', what are the numbers?
31, 35, 39
Draw a two-way table to represent the following information:
You are growing 200 beans, some short and some tall. 130 of your beans are tall beans.
Some of the plants got attacked by slugs and some did not. 30 of your tall beans got attacked by slugs and 50 of your short beans got attacked as well.
I will check your table
Determine the number of female students required to be part of a sample of 30 students if stratified sampling is used and there are 180 male students and 120 female students.
12
from left to right, what would the order of the mean, median and mode be in for negatively skewed data?
mean, median, mode
If a dot plot has values ranging from 1 to 10 but most of the dots are clustered around 3 and 7, what does that tell you about the distribution?
bimodal distribution
100 customers tried two new sauce flavours at MacDonalds. 40 liked Sauce A, 58 liked Sauce B and 20 liked neither sauce.
How many people liked both sauces?
18