Definitions
A numerical summary of a population.
What is a PARAMETER?
The MEDIAN of these numbers:
80, 95, 97, 23, 105
What is 95?
This type of random variable
x = 0, 1, 2, ....., 150
What is DISCRETE?
The shape of the distribution when the mean is less than the median
What is skewed left?
The name for this type of hypothesis test:
H0: p = .45
H1: p < .45
What is a Left-Tailed Test?
A quantitative variable that has an infinite number of possible values it can take on and can be measured to any desired level of accuracy.
What is a CONTINUOUS variable?
The numbers in the Five number summary
What is Q1, Median, Q3, MIN, & MAX
n =15, p = 0.3, x = 4
The probability of 4 successes.
What is .2186?
Varying the value of the explanatory variable affects the value of this variable.
What is the RESPONSE VARIABLE?
A GSU survey of 125 students found 65 of them prefer morning classes.
the 99% confidence interval for students that prefer morning classes is (____).
What is ( 0.4049 - 0.6351)?
Measures the value of the response variable without attempting to influence the value of either the response or explanatory variables.
What is an OBSERVATIONAL STUDY?
Q1 = 10. Q3 = 15
The number 2 in this data set.
What is an outlier?
n = 8, p = 0.35, x < 4
The probability of less than 4 successes
What is 0.7064?
The linear corelation coefficient of this data:
(1, 16) (2, 35) 3, 46) (6, 74) (8, 92)
What is 0.992
H0: mean = 50. H1: mean < 50. n = 23
Sample mean = 47.9 s = 10.6
The proper conclusion of this hypothesis test at the 5% level of significance.
(Must compute test statistic & critical value)
What is fail to reject null hypothesis?
The expected z-score of a data value, assuming the distribution of the random variable is normal.
What is a NORMAL SCORE?
The sample standard deviation of this data set:
20, 14, 3, 7, 12.
What is s = 6.53
42% of GSU students have above a 3.0 GPA
In a sample of 300 students the mean is___.
What is 126?
IQ scores are normally distributed with a mean of 100 and standard deviation of 19
The percentage of people with an IQ score less than 81 OR greater than 119.
What is 32%
Population is normally distributed
sample mean = 100. n = 16. s = 12.5 Two tailed test
The 99% Confidence interval is ____.
What is (90.792 - 109.21)
Measures the proportion of total variation in the response variable that is explained by the least-squares regression line.
What is the Coefficient of Determination?
Average male height 69.6 inches s = 3.2
Average female height 64.5 inches s = 3.8
Jack is 75 inches Jill is 70 inches.
________ is relatively taller.
(Must show z scores)
Who is Jack?
55% of GSU students prefer chocolate ice cream.
In a sample of 500 students. The standard deviation is_______.
What is 11.12?
Human pregnancies are normally distributed & have a mean length of 266 days with a standard deviation of 16 days.
The proportion of pregnancies more than 300 days long is _____.
What is 0.0168?
n1= 23, x1= 46, s1= 6.3. n2= 16 x2= 38.2 s2= 7.7
Right tailed test.
____ the null hypothesis
(Must show test statistic & critical value)
What is Reject?