The value or values that occur most frequently in a number set.
The mode.
100
What is a random sample?
Each member of the population has an equal chance of being selected.
100
What is the definition of a biased sample?
One that does not fairly represent the population.
100
How do you find the range of a number set?
Subtract the smallest value from the largest value in the set.
200
You find this by adding up all the values in a number set and then dividing by the total number in the set.
The mean.
200
A question that leads people to give a certain answer is as ________ _________.
Biased question
200
Determine whether the survey question is biased or not. Explain.
"How many hours do you exercise each week?"
No, because it is not a leading question that would persuade the sample to answer a certain way.
200
What are the lines making up the right angle on a graph called?
Axes - horizontal and vertical
300
Number Set: 12, 14, 21, 9, 11, 10
How do you find the median and what is it?
By adding 11 and 12 together, and dividing by 2.
median = 11.5
300
The owner of a sporting goods store wants to know how many of his customers play basketball, so he takes a random sample of every fifth customer that comes in one day.
What is the population?
All customers of the sporting goods store.
300
A park employee surveys 20 joggers in a park to determine whether more bike trails should be added to the park.
Is this sample biased? Explain.
Yes, because this may not be representative of all park users.
300
Determine whether the sample is biased or not. Explain.
Theo surveys every fourth person entering a grocery store to find out the average number of pets in people's homes.
Not biased because the sample is random.
400
Number Set: 48, 39, 27, 52, 45, 47, 49, 37
Find the mean.
43
400
A researcher wants to know how many brands of oatmeal a grocery store sells. Would it make sense for him to use a sample?
No, because the population (total number of brands) is small enough that he can record them all.
400
Do you prefer the sleek and stylish cell phone or this plain one?
Is this question biased? Explain.
Yes, because people may be more likely to choose a cell phone that is described as sleek and shiny.
400
Find the mean, median, and range.
Number Set: 22, 16, 19, 22, 25, 18
Mean: 20.33
Median: 20.5
Range: 9
500
Number Set: 10, 4, 7, 8, 34, 7, 7, 12, 5, 8
Find the mean, median, mode, and range
mean - 10.2
median - 7.5
mode - 7
range - 30
500
Think of your own unbiased survery. How would you choose your sample and what is the question you want answered?
Answers will vary.
500
Ashley conducts a survey to find out how teenagers in her town spend their free time. She asks 40 teenagers at a local soccer game, "What is your favorite hobby?" The majority of teenagers said they liked playing sports.
Is Ashley's claim valid? Explain.
No, because the sample is biased. Teenagers at a soccer game may be more likely to play sports than other teenagers would.
500
A school's yearbook includes 1,350 photos. Steve estimates that 35 of the photos are black and white. In a random sample of 150 yearbook photos, 4 of them are black and white. Determine whether Steve's estimate is likely to be accurate. Explain.
4/150 = x/1,350
5,400 = 150x
x=36
Based on the sample, about 36 of the photos are black and white. Steve's estimate of 35 is likely to be valid.