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Terms in this set (47)
Choose all variables for which it is appropriate to look at a histogram and/or a box & whisker plot to determine distribution shape?
Age
GPA
Average hours spent weekly studying
Choose all variables for which it makes sense to do a SOCS analysis.
Age
GPA
Average hours spent weekly studying
What type of display(s) would you use to study whether or not there is a relationship between whether or not a person is in a fraternity or a sorority and whether or not they worked during the school year?
Contingency table
What type of display would you use to study whether or not there is a relationship between GPA and the average number of hours per week spent studying outside of class.
Scatter
Choose all variables for which it is appropriate to create a frequency table and a bar chart.
Gender, Whether or not they are in a fraternity or sorority, Whether or not they worked during the school year
Slope
when median income increases by 1 housing costs will change on average by the slope
What is the contextual interpretation of the y-intercept in this situation?
the mean value of housing costs when median income is 0
The calculated values of b0 and b1 are the unique values that:
minimize the sum of the squared residuals
R2
the model has accounted for 45% of the observed variation in the dependent variable
You are going to randomly sample one vehicle from a full parking lot and write down its dominant color. What kind of events are G, the car is green and R, the car is red. Choose all that apply.
Mutually Exclusive Events
2. You run an experiment where you roll a fair die twice and write down the the number of dots that are face up for roll one and roll two. What kind of events are the number of dots on roll one and the number of dots on roll two? Choose all that apply.
Independent Events
3. If X is a variable that follows a binomial distribution with n = 4 and p = 0.4 choose all answers that equal P(X < 1).
P(X = 0), 0.1296
6. A sample of size 36 is taken from a slightly skewed right population with a mean of 20 and a standard deviation of 6. What is the sampling distribution (model) for the sample mean.
Normal distribution with a mean of 20 and a standard deviation of 1.
7. A random sample of 200 customers at a grocery store is taken. For each person it is noted whether or not they use a frequent shopper card when they check out. It is known that for this particular store the fraction of the population having a frequent shopper card is 0.30. If p-hat is the fraction of the sample of 200 who use a frequent shopper card, what is the sampling distribution model of p-hat?
Normal distribution with a mean of 0.30 and a standard deviation of 0.032
A 95% confidence interval for a population mean is formed from a random sample. The interval is (22, 46). The margin of error for this interval is:
12
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