The correlation when y tends to increase as x increases.
What is Positive Correlation?
100
The mean, median, and mode of this data set.
6, 22, 4, 15, 10, 8, 8, 7, 14, 20
What is...
Mean - 11.4
Median - 9
Mode - 8 ?
100
This kind of distribution had a symmetrical bell-shaped curve called a normal curve.
What is Normal Distribution?
100
What is the difference between and unbiased and biased sample?
An unbiased sample represents the population you want information about, and a biased sample overrepresents the population or underrepresents part of the population.
100
In this kind of study, an investigator assigns the individuals to the experimental group or the control group.
What is an experimental study?
200
The correlation when y tends to deease as x increases.
What is Negative Correlation?
200
The range and standard deviation of this data set
47, 18, 65, 28, 43, 18
What is...
Range - 47
Standard Deviation - 18.56 ?
200
A normal distribution has a mean of 27 and a standard deviation of 5. This is the probability that a randomly selected X value from the distribution is
between 12 and 27.
What is 0.4985?
200
Amy, a reporter, wants to survey workers about where they eat lunch during a typical work week. She writes a column asking workers to call a special phone number and identify where they eat lunch during a typical work week. This is an example of what type of sampling method?
What is self-selected. The workers can choose whether or not to respond.
200
In this kind of study, the assignments of individuals to the experimental group or the control group is our of the investigator's control.
What is an observational study?
300
The equation for the median-median line of the data
x 5 | 5 | 7 | 8 | 9 | 11 | 12 | 12 | 14
y 3 | 8 | 5 | 7 |11| 10 | 15 | 19 | 20
What is y=2x-6
300
The mean, median, and mode of this data.
0.12, 0.54, 0.36, 0.17, 0.36, 0.94, 0.88
What is....
Mean - about 0.48
Median - 0.36
Mode - 0.36 ?
300
A normal distribution has a mean of 27 and a standard deviation of 5. This is the probability that a randomly selected X value from the distribution is
at most 32
What is 0.84?
300
A real estate agent wants to know if first-time home buyers used the Internet to research home listings. The real-estate agent calls every fifth first-time home buyer and asks them if they used the Internet to research home listings. What type of sample is described?
A Systematic Sample
300
you want to study the effect that music has on the ability to recall knowledge. Each individual in your study is given a piece of unfamiliar reading material and then asked to take a factual quiz on the reading material. The control group is individuals who read the material and take the quiz in a quiet room. the experimental group is individuals who read the material and take the quiz in a room that has classical music playing. Tell whether this study is experimental or observational.
This is an experimental study because you assign individuals to groups.
400
This data has this type of correlation.
x 36 | 67.2 | 92.9 | 141.6
y 810| 864 | 136 | 23
What is Negative Correlation?
400
The range and standard deviation of this data set.
29.4, 22.9, 15.7, 26.9, 24.0, 27.5, 11.4
What is...
Range - 18
Standard Deviation - 6.1 ?
400
A normal distribution has a mean of 125.8 and a standard deviation of 10.4. Use the standard normal table on page 296 of your Purple Math II bookto find the indicated probability for a randomly selected X value from the distribution.
P(x≤92.6)
What is 0.0007?
400
Find the margin of error for a survey that has a sample size of 8968. Round to the nearest tenth of a percent.
What is ±1.1%
400
A manager wants to study the effects that positive reinforcement has on an employee's willingness to work overtime. The control group is employees who are given no reinforcement. The experimental group is employees who are given positive reinforcement during their weekly meeting with their manager. Is this study experimental or observational? Explain.
Experimental study; the manager is assigning employees to the control group and the experimental group.
500
The equation of the median-median line for the data.
x| 1 | 2 | 2 | 4 | 5 | 6 | 7 | 7 | 8
y| 48 | 42 | 50 | 45 | 69 | 44 | 82 | 93 | 96
What is y=9x+20?
500
The mean, median, mode, range, and standard deviation of this data set.
51, 48, 47, 46, 45, 43, 41, 40, 40, 39
What is...
Mean - 44
Median - 44
Mode - 40
Range - 12
Standard Deviation - 3.8 ?
500
An obstacle course was set up for gym class. THe time to complete the course is normally distributed with a mean of ! minute and 25 seconds and a standard deviation of 8.7 seconds.
Rory completed the course in 1 minute and 31 seconds.
Find the z-score for Rory's time.
What is 0.7?
500
A survey reported that 510 kids ages 8 to 18, or 68% of them surveyed, have a TV in their bedroom. What is the margin of error for this survey? Round your answer to the nearest tenth of a percent.
The margin or error is 3.7%
500
A professor wants to study the effects that teaching outdoors has on his test scores. Each individual in the study is given the same lectures for a month, and tested indoors. The control group is individuals who were lectured and tested outdoors. Tell whether the study was experimental or observational.
The study was experimental; the professor is assigning individuals to the control group and the experimental group.