Exploring 1 Variable Data
John wants to model the average number of calories that he gets per day. What type of data is this (categorical vs. quantitative and discrete vs. continuous)
What is quantitative and continuous?
What type of relationship depicts a positive slope? (as x increases so does y)
What is a positive linear association
There are 10 marbles in a bag. 2 of the marbles are red, 3 of the marbles and white, and the rest are blue. What is the probability that you pick a red or blue marble from the bag?
7/10
If a test has a power of 0.85, what is the probability of Type II error?
What is 0.15
What is the format of the least squares regression line?
What is ŷ = a + bx
One of the graphs or charts used for one variable data
What is a bar chart, histogram, box and whisker, pie chart, or dot chart
What is the formula for calculating the residual?
What is y - ŷ; observed y - predicted y
Which of these 3 events mean the same thing: Mutually Exclusive, Disjoint, and Independent? Explain what the two similar terms mean
What is Mutually Exclusive and Disjoint and two events that cannot happen at the same time
A two-sample t-test is conducted, and a p-value of 0.0036 is procured. At the a = 0.05 significance level, the researcher should _______ the _________ hypothesis
Reject; null
When the p value is less than the alpha value, what conclusion do you draw?
What is reject the null hypothesis?
Find the mean of the data:17, 27, 26, 2, 1, 21, 13, 16, 19, 5, 7
What is 14?
When r is closer to +/- 1, how does this impact correlation?
What is stronger coefficient correlation?
The combined mean of random variable X that has mean 3 and standard deviation 0.5 and random variable Y that has mean 2.5 and standard deviation 1.6.
What is 5.5
A study is conducted on a population of size 10,000. In order to satisfy the condition of independence, the sample size cannot be greater than what?
What is 1000 people
What is a type 2 error?
What is the null hypothesis is false but is failed to be rejected
Acronym for describing distribution of one variable data and what each letter stands for
What is CSOCS (Context, Shape, Outlier, Center, Spread)
When graphing a scatterplot of data points involving two variables, what do the letters LSRL stand for?
What is the Least Squares Regression Line
What is the formula for the probability of A and B if A and B are independent? P(A and B)
What is P(A) x P(B)
An decrease in the significance level increases the likelihood of what type of error?
Type 2 error
What does the following statistical symbol represent: x̄
What is the sample mean or What is x-bar
The amount of candy dispensed by a candy machine is normally distributed with a mean of 0.9 oz and a standard deviation of 0.15 oz. If the machine is used 500 times, how many times will it dispense more than 1.05 oz of candy?
What are 79 (or 80) candies?
The percent of variation in the response variable that is explained by the explanatory variable in the model
What is coefficient of determination
85 percent of teens say they get less than 8 hours of sleep a day. A random sample of 25 employed young adults will be selected. What is the formula to find the probability that 15 of the teens got less than 8 hours of sleep?
What is P(X=15) = (25 choose 15)(.85)^15(.26)^10
What assumptions must be met to make an inference for a two sample z test?
What is Independence, Normal, Simple Random Sample
What does the given formula represent?: statistic ± (critical value) (standard deviation of statistic)
What is the confidence interval