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A study was carried out to see whether acupuncture can relieve stress; another study looked at whether Rogaine results in significant hair restoration.
a. Which of the two studies is more susceptible to the placebo effect? Explain.
b. For which of the studies would it be easier to make the subjects blind to whether or not they are receiving the actual treatment?
suppose 3 of cotton fabric rolls and 3 of nylon rolls contain flaws. of the rolls used by a manufacturer 70 are cotton
Compute the value of the test statistic. Determine the p-value; and at 93.7% confidence, test the above hypotheses.
What is the Spearman coefficient of rank correlation, what range of values can it have, and how is its numerical value interpreted? Two travel editors have each ranked 10 popular vacation spots according to the value they represent for the money..
Use the value 20 for the population standard deviation of scores on this subsection.
Compare the mean in USD with the mean in cents; do not forget the units. Explain what multiplying each number in a data set by 100 does to the mean.
your task is to interview a representative sample of attendees to a large concert.the schedule includes 200 live
A dataset has 1000 records and 50 variables with 5% of the values missing, spread randomly throughout the records and variables. An analysis decides to remove records that have missing values. About how many records would you expect would be remov..
The body mass index (BMI) was measured in 1,200 randomly selected adults, with the results shown in the table.
An investigator wants to design a study to estimate the difference in the mean BMI between boys and girls age 12 living in new york city. How many boys and girls are needed to ensure 95% confidence interval estimate for the difference in mean BMI ..
describe some benchmarking performance metrics for the airline
What is the 99% confidence interval, if the population standard deviation is known to be 10 days? What is the 99% confidence interval, if the sample standard deviation is 10 days?
Dr. Mack Lemore, an expert in consumer behavior, wants to estimate the average amount of money that people spend in thrift shops. He takes a small sample of 8 individuals and asks them to report how much money they had in their pockets the last ti..
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