"Concepts of a Plan"
A confidence interval is a(n) _____ that includes the population mean a certain percentage of the time if the same population is sampled from repeatedly.
Interval estimate
Normal distributions are described as:
1. _______________
2. ________________
3. ________________
1. Unimodal
2. Symmetrical
3. Mathematically defined
_____ is the symbol that represents standard error (population).
๐M
This question gets 120 seconds:
Here is a list of datapoints:
1, 3, 3, 3, 4, 6, 12, 16, 24, 27
Please calculate the Mean, Median, & Mode
Mean = 9.9
Median = 5
Mode = 3
When attempting to find a percentage associated with a particular z score, an important step involves looking at a:
z table
Which "branch" of statistics uses numerical observations and incorporates them into an organized and informative summary of the data?
Descriptive
Below or Above?
A negative skew may have a tail that indicates extreme scores _____ the center of the distribution.
Below
The equation z(๐) + ยต is used to convert a _____ to a _____.
z score to a raw score
This question gets 90 seconds:
Here is a list of datapoints:
1, 3, 3, 3, 4, 6, 12, 16, 24, 27
Calculate the Range
Range = 26
The critical value(s) associated with a p level of 0.05 for a two-tailed hypothesis test using the z statistic is (are):
-1.96 and 1.96
Fill in the Blank:
1.) A _______________design has different people in each group and can be analyzed using an Independent Samples t Test.
2.) A _______________ design has the same people in each group and can be analyzed using a Paired Samples t Test.
1.) Between-Subjects/Groups
2.) Within-Subjects/Groups
In a _________ skewed distribution, the tail of the distribution extends to the right.
Positively
Jillian wants to see if there is a difference between the U.S population of coffee drinkers (ยต = 3.1, ๐ = 0.9) to a sample of 34 coffee drinkers at a local coffee shop (M = 3.8). What equation would be of most use to her?
Please write the equation on your whiteboard.
z = M - ยต / ๐M
This question gets 120 seconds:
Here is a list of datapoints:
1, 3, 3, 3, 4, 6, 12, 16, 24, 27
Calculate the Interquartile Range
Q3 โ Q1 = 17
To conduct a single-sample t test, you need:
(A known population and sample mean and) an unknown standard deviation of the population (๐ )
Rita wants to compare young children's reading test scores across three instructional conditions: phonics, whole language, and one control group (no instruction). What type of statistical test should she use?
ANOVA
A standard deviation is equal to 6.40. This number means that the numbers in the sample deviates ____________________ from the mean.
6.40 units from the mean.
Which equation is the correct formula for the t statistic?
M - ยต / sM
This question gets 120 seconds:
The Mean of the dataset from prior questions is M = 9.9. Please calculate the appropriate values for scores (X) 1 and 3. Use prompt below:
X X โ M (X โ M)2
1 # #
3 # #
X X โ M (X โ M)2
1 1-9.9 = -8.9 (-8.9)2 = 79.21
3 3-9.9 = -6.9 (-6.9)2 = 47.61
F is obtained by dividing _____ by _____.
MSbetween; MSwithin
Scatterplots are often used to assess what type of pattern the data create between two variables. For example, when the data form a pattern that flows downward and toward the right in a straight line, this is considered to be a(n):
negative linear relation
Use your whiteboard, this question gets 90 seconds:
Draw a normal curve and plot the critical values of a z-test. Label the space within and outside of the critical values with the appropriate decision phrases.
Critical values for a z test: -1.96 and 1.96
Within -1.96 and 1.96: "Fail the Reject the Null Hypothesis"
Outside of -1.96 and 1.96: "Reject the Null Hypothesis"
This question gets 120 seconds:
George wants to conduct an independent samples t test. The value for the standard error for the difference between the means (sM) is 2.45. Group A has a mean of 14 (MX), and group B has a mean of 17 (MY). What is the value of t?
t = -1.22
This question gets 90 seconds:
The sum of squares has been calculated for all of our data points of interest. We calculated a value of 804.9 as our sum of squares for a sample of 10 datapoints (N = 10). Please calculate the standard deviation.
sq root of 804.9/ 10 = 8.97
This question gets 120 seconds:
What is the paired-samples t statistic when using Mdifference = 8.0, s = 9.3, N = 24?
t = 4.21