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A consumer group decides to test the effectiveness of a new "organic" laundry detergent. They intentionally get grass stains on a sample of 60 white T-shirts in order to see how well the detergent will clean them. Each shirt is randomly assigned to one of three water temperatures ( cold, warm or hot), and one of two wash cycles ( regular or delicate). The level of cleaning for each shirt is recorded on a scale from one to ten; the person evaluating the cleaning level is unaware of the treatment used on the shirt. The average cleaning level for each treatment group is calculated.
Identify the following for the experiment:
A. 1) Explanatory variables
2) Response variable
3) Number of treatments
4) The experiment units are:
B. The average cleaning level is a Parameter or Statistic ?
C. Is blinding used in the experiment? (Explain the reason for using blinding in a n experiment)
Use Hypothesis Testing and the data in the course materials folder to analyze the difference in milk production in California. Formulate both a numerical and verbal hypothesis statement regarding your research issue.
Using the following data, test the question that an equal number of Democrats, Republicans, and Independents voted during the most recent election.
Within each of your current careers/ jobs, there are sets of data that can be analyzed. For example, a teacher can use a set of test scores, a dietician can analyze a set of patient weights and correlate them to incidences of diabetes, and a sales..
nbspuse the following data to answer questions. total no. of problems correct out of a possible 20attitude toward test
The cost of gasoline will decrease or stay the same over the next 30 days because of summer holiday travel. What is your alternative hypothesis statement?
Using a one-sided hypothesis test with a 90% confidence level, which of the following statements do these data support?
Puret grinder has required repair service according to the following distribution. Compute the mean, for the following probability distribution of the number of breakdowns per week.
question as a student you probably have noticed a curious phenomenon. in every class there are some students who zip
A random sample of 15 paired observations has a correlation of -.46. Can we conclude that the correlation in the population is less than zero? Use the .05 significance level.
If the monthly demand for videos on average is 180 and standard deviation = 60, what is the number of videos the manager should order to meet 90% customer demand?
A population that starts at 100 and doubles in growth every eight years: The expression would give the population t years after the growth starts.
Standard deviation is $0.10. At α = 0.01, is there significant difference in price? Determine the 99% confidence interval of the difference in the means.
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