How is the data distribute if the mean is 30 units and the median is 65 units?
What is skewed to the left
100
Statistically significant means
What is the effect is unlikely to have occurred by chance
100
The assumptions for a 2 Sample T test are
What is Independence, Normal population, 2 groups are independent
100
What are the assumptions of a Paired T test?
What is Independence, Normal population, paired data
100
When working with proportions, what distribution table do you use?
What is z table
200
The probability that a student owns a dog is .3. The probability of a student being male is .6. The probability of a student who owns a dog is male is .1. What is the probability that a student is either a male or owns a dog?
What is .3 + .6 - .1 =.8
200
Correlation coefficient measures...
What is the linear relationship between 2 quantitative variables
200
In this course, the df for a 2 smaple T-test is
What is min(n1-1, n2-1)
200
What is the standard error for paired data?
What is s_d/sqrt(n_d)
200
What is wrong with this statement:
The correlation between age and hair color is 0.8
What is hair color is not a quantitative variable
300
Given the following probability distn, what is the expected value?
X: 2, 1, 3, 2, 1
P(X): .4, .1, 0, .3, .2
What is 1.7
300
What is wrong with this statement: The correlation between age and hair color is 0.8
What is hair color is not quantitative
300
What is the margin of error for a 2 sample t test?
What is t*_[min(n1-1,n2-1)]*sqrt[(s1^2/n1)+(s2^2/n2)]
300
What is the t value if d_bar=-0.933, n=15, and s_d=1
What is (-.933-0)/(1/sqrt(14))=-3.49
300
In a deck of cards, there are 4 kings. If you drawl 3 cards (w/replacement), what is the probability of getting all kings?
What is 4/52*4/52*4/52
400
Exam scores follow a normal distribution. If the mean of exam scores is .7 and the sd of exam scores is .1. The 68th percentile of exam scores is
What is .47=(x-.7)/.1=.747
400
The definition of type II error is
What is when one fail to rejects the null even though it is really false
400
With a CI of (-2.585, .719) and a null hyp Mu1-Mu2=0, what would you conclude?
What is Fail to reject
400
Bound the p-value if your calculated t -value is 2.5 with n=11. The alternative is not equals.
What is .02 < pvalue < .05
400
In a deck of cards, there are 4 kings. If you drawl 3 cards (w/o replacement), what is the probability of getting all kings?
What is 4/52*3/51*2/50
500
What is it called when inherent sample to sample differences are seen when repeated sample statistics are taken?
What is sampling variability
500
10 Freshman and 10 seniors are recruited in a study. Researchers want to know whether watching tv while studying decreases memory skills. The researchers have each participant study something and then test them on how well they remembered. For the same participants, they had them watch tv while studying and then gave them a test to see how well they remembered. Is this a 2 sample T-test or Paired T-test? Why?
What is Paired T-test because the same participants are used for each treatment.
500
What is the standard deviation in a 2-sample T test?
What is sqrt[(sigma1^2/n1)+(sigma2^2/n2)]
500
Paired t-interval and t-tests for mu_d have the same form as...