name test/interval
Below is the data for the amount of money paid for parking tickets separated by gender for the rockville area. Use the 96% confidence interval for the true difference in the amount of money paid by men and women.
What is 2 sample t interval?
An ad agency gathers information about the habits of Texas consumers who live in very small towns (less than 100 adults). They randomly select 12 of these small towns and then interview all of the adults in each of these towns.
Type 1 error
What is rejecting the null hypothesis when it is actually true?
The diameter of a spindle is a small motor that is supposed to be 5 mm. If the spindle is either too small or too large, the motor will not work properly. The manufacturer measures the diameter in a sample of motors to determine whether the mean diameter has moved away from the target.
What is
H0μ = 5mm
HAμ =/ 5mm
?
Double blind
What is where neither the researcher nor the subjects knows if they are being given the treatment or the placebo?
A psychologist claims that the mean age at which children start walking is 12.5 months. The following data give the age at which 18 randomly selected children start walking.
What is t test?
At the start of each shift, randomly select a number from 1 to 10, choose that person as they arrive and then test every 10th person after who arrives for work.
What is systematic?
Type 2 error
What is failing to reject null hypothesis when it is actually false?
Census Bureau data show that the mean household income in the area served by a shopping mall is
$42,500 per year. A market research firm questions shoppers at the mall. The researchers suspect the mean household income of mall shoppers is higher than that of the general population.
What is
H0μ = $42500
HAμ > $42500
?
Confounding/lurking variable
What is a factor that isn’t being accounted for that may affect the result ?
A random sample of eight students was selected to test for the effectiveness of hypnosis on their academic performance. The following table gives the GPA for the semester before and after they tried hypnosis.
What is matched pairs t test?
There are four employee classifications: doctor, medical staff (nurses, techs, etc), office staff, support staff (custodians, etc). Randomly select 10 employees from each category.
What is SRS?
Parameter
What is describes characteristics of the population?
Last year, your company’s service technicians took an average of 2.6 hours to respond to trouble call
from business customers who had purchased service contracts. Do this year’s data show a different average response time?
What is
H0μ = 2.6 hrs
HAμ =/ 2.6 hrs
?
Factors
What is the explanatory variable manipulated by the experimenter?
In a random sample of 60 people, it was found that 14% had blonde hair. Find the 90% confidence interval for the true proportion of people who have blonde hair.
What is 1 prop z int?
A business wants to know what its customers think of a new product and they think that men and women may view the product differently. A random sample of 45 men and 50 women is selected to complete a survey on the product.
What is stratified?
Statistic
What is describes characteristics of the sample?
According to the MVA 35% of drivers will be in an accident in the next 5 years. Dr. Allen, believes this
is too high.
What is
H0μ = 0.35
HAμ < 0.35
?
Treatments
What is the different levels of factors?
A sample of 800 items produced on a new machine showed that 48 of them are defective. The factory will get rid of the machine if the data indicates that the proportion of defective items is significantly more than 5%. At a significance level of 10%, does the factory get rid of the machine or not.
The Podunk school district wishes to give a survey to some of its middle school students regarding the quality of the school lunches served in the cafeteria. From the fifteen middle schools in the district, three of the schools are randomly selected. The survey is then sent home to all the students of those three selected schools.
What is cluster?
P-value
What is probability of observing a value at least as extreme as sample if null is correct?
The average student spends 6 hours on homework every week. Ms. Osborne believes that Wheaton
students spend more than that bettering their grades.
What is
H0μ = 6 hrs
HAμ > 6 hrs
?
Response variable
What is the outcome of the experiment, the thing being measured?