Probability
A bag contains marbles; 3 red, 2 green, 5 yellow, 8 black, 4 purple. The probability of drawing a yellow marble and then a black marble.
What is 20/231
A coin and a die are both rolled. What is the probability of flipping tails and an even number?
What is 1/4
Convenience sample
What is choosing samples that are easy to reach
-Can be biased-
A company wishes to survey what people think about a new product it plans to market. They decide to randomly sample from their customer database as this includes phone numbers and addresses" is an example of this kind of sampling method.
What is convenience sampling?
Before taking an exam, students either went to bed at their normal times or were sleep deprived 4 or 8 hours. Half of each group were given a caffeine pill before taking the exam. Determine the number of factors, levels for each, and number of treatments.
What is two factors, one with two and one with three levels, six treatments.
Flipping a coin and if it is tails rolling a die for 4 or greater.
What is 1/4
A spinner has 6 equal sections, red, blue, yellow, green, orange, and pink. What is the probability that the spinner will land on yellow?
What is 1/6
Bias
What is when you data gets overestimated or underestimated
To conduct a survey on holiday shopping patterns, a researcher opens a telephone book to a random page, closes his eyes, puts his finger down on the page, and then reads off the next 100 names. This is an example of...
What is Systematic sample.
An advantage to using surveys as opposed to experiments is that. A. surveys are generally cheaper to conduct. B. it is generally easier to conclude cause and effect from surveys. C. surveys are generally not subject to bias
What is A. surveys are generally cheaper to conduct
How many different ways can 5 airplanes be arranged at 5 gates?
What is P(5,5) = 5*4*3*2*1 = 120?
A spinner has 10 equal sections, 1,2,3,4,5,6,7,8,9, and 10. If the spinner is spun, what is the probability of spinning a number less than 7?
What is 3/5
Infernce
what is drawing conclusions about a population based on a sample.
Suppose your local school district decides to randomly test high school students from ADD. There are three high schools in the district, each with grades 9-12. The school board pools all of the students together and randomly samples 250 students. Is this a simple random sample?
Yes, because they could have chosen any 250 students from throughout the district
100 volunteers who suffer from depression. 50 were randomly selected to receive a new drug thought to treat severe depression, while 50 others were given an existing drug for treating severe depression. A psychiatrists evaluates all of the symptoms after four weeks in order to determine if there has been a substantial improvement in the severity of depression. The factor is...
What is the treatment the volunteers received.
Selecting from 30 named sticks (no repeats) from a cup with replacement. Of drawing the names Caitlin and Amairis
What is 1/900
A blue number cube and an orange number cube are rolled. What is the P(3, then even)?
What is 1/12?
colors are not important ha tricked ya
Intersection of events
What is two events that are in both A and B A∩B
∩ = and
Which of the principle of experimental design is not required?
What is Blocking
50 migraine patients are randomly selected from hospital records. Half the patients are told to drink ice water and sit in the dark when they next experience a migraine; the remaining patients are told to use neither of these possible remedies. Participants then report back as to relief, if any. Faults of this experimental design include all of the following except: A. Lack of randomization B. Confounding variables C. Lack of blinding
What is C. Lack of blinding
5 unique bunnies in a bag. The probability that a black bunny will escape once the white and the spotted one have escaped.
What is 1/60.
Ms. Ryebread and Ms. Beefcakes class has 20 boys and 12 girls. What is the percent chance that they will choose a girl to answer a question?
What is 12/32 so 37.5%?
Union of events
What is all events that are in A or B or both A∪B
∪= or
A candy manufacturer wants to test consistency of the sugar content of chocolate-covered cherries produced. They decide to randomly select three boxes of chocolate-covered cherries from each day's production at the factory and analyze every cherry in each of these boxes as to sugar content. What type of sampling is this? A. Cluster B. Convenience C. Simple random D. Stratified E. Systematic
What is a Cluster
A chemistry professor who teaches a large lecture class surveys his students who attend his class about how he can make the class more interesting, hoping he can get more students to attend. This survey method suffers from...
What is voluntary response bias