Vocabulary
A controlled study in which groups are applied treatments
What is experiment?
Which type of study would make the most sense if the superintendent wants to determine which meal choice students prefer the most; an experiment, an observational study, or a survey?
What is a survey
A car comes in 3 different body styles and 5 different colors. How many possible options are there?
What is 15
Dog weights at a local vet have a mean of 45 pounds and a standard deviation of 5 pounds. Estimate the percentage of dogs between 40 and 50 pounds?
What is .6826 or 68.3% or roughly 68%
Given a normal distribution with a mean of 70 and a standard deviation of 4.5, what is the probability a value is between 60 and 85?
What is 0.9864 or 98.6%
Non-numerical data based on type
What is qualitative (or categorical) data?
A survey was given to a randomly selected sample of 500 students at Brockton High School to determine which television shows are preferred by high school aged teenagers. What is the population in this study?
What is high school aged teenagers
The probability it will rain any given day is 0.21. What is the probability it will not rain any given day?
What is 0.79
Heights of high school male seniors are normally distributed with a mean of 67 inches and a standard deviation of 3 inches. Estimate the percentage of male high school seniors between 67 and 73 inches?
What is .0.4772 or 47.7% or roughly 47.5%
What is the probability of picking two vowels in a row from the word "alphabet" if the letters are selected at random and not replaced.
What is 3/28 or 0.107 or 10.7%
Errors that result in a misrepresentation of members of a population.
What is bias?
In an experiment to determine whether taking an aspirin every day lowers the risk of having a heart attack, 700 people in one group take an aspirin and the other group of 700 people take a pill with inactive ingredients. The group that does not take the aspirin is called...
What is the control group
What is the probability of picking two vowels in a row from the word "break" if the letters are selected at random and not replaced.
What is 1/10 or 0.1 or 10%
The class average on a test was 78 with a standard deviation of 8 points. What is probability a student got 70% or less?
What is 0.16 or 16%
What percent of data in a Normal Distribution is above 3 SD and below 3 SD?
What is 0.3%?
A variable that measures an outcome or result of a study.
What is response variable?
An error that results in misrepresentation of members of a population.
What is bias
A spinner with the numbers 1 through 8 is spun and a normal die is rolled. What is the probability of spinning an even number greater than 2 on the spinner and an odd number greater than 2 on the die?
What is 1/8 or 0.125
An average female is 5'4'' (64 inches). The standard deviation for average female heights is 2.5 inches. Madee is 5'2". Approximately what percentage of women are taller than her? (round to a whole number)
What is 84%
(0.34+0.34+13.5+2.35+0.15 = 0.84)
The actual weights of bags of pet food are normally distributed. The mean of the weights is 50lb. with a standard deviation of 0.2lb. In a group of 250 bags, how many bags would you expect to weigh more than 50.4lb?
What is 6 bags
(2.5% of 250).
Also known as the 68 95 99.7 rule, used for normal distributions
What is Empirical Rule?
A pill that looks and tastes like the real medication but contains no active ingredients.
What is a placebo
If I am rolling two fair dice, what is the probability that the sum of the two dice is 6?
What is 5/36 or 0.139
Freshman GPAs at Walla-Walla High School have a mean of 2.93 and standard deviation of .39. What is the probability a student has a GPA of between 2.15 and 3.32?
What is 0.815 or 81.5%
When neither the subject nor the researcher know who receives treatment or placebo.
What is a double-blind experiment.