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A researcher wants to create a 99% confidence interval for the population mean. He has a sample of n=120, an x-bar of $340, and a sample standard deviation of $122. What is the margin of error?
What is correlation? Does correlation directly support causation, what are both sides of the argument?
Need a behavioral research situation that could use a Pearson coefficient research study and a chi square research study; also understanding the rational of each one.
Public transportation and the automobile are two methods an employee can use to get to work each day. Samples of times recorded for each method are shown. Times are in minutes.
Conduct a test to determine whether blood lactate level (y) is linearly related to perceived recovery (x). Use alpha = .05. Find the p-value for testing the hypotheses you gave in the previous problem. Show all decimal places in your answer.
You are the production manager of a company. Parachutes are woven in your factory using a synthetic fiber purchased from one of four different suppliers. The most important outcome for parachutes is strength of the fabric.
How much variability will you have if you predict sales with this model?
What sample size would be needed for an error of ± 1.5 with 98 percent confidence? (Data are from a project by MBA student Wendy Blomquist.)
At a = 0.05, can you reject claim that at least 52% of adults are more probable to purchase a product when there are free samples?
At a large commercial bakery, one of the measures familiar with evaluate employees is the number of broken cookies per 1000 produced. The quality control department wants to determine if there is a relationship between years of experience and bro..
Given that the mean of 100 observations is 42.5 and that their standard deviation is 6.313, find the sum of the squares of the observations.
Variance hour 100 and battery y: sample size 12,mean hour 1020,variance hour 121. can you conclude that two types of batteries are having the same mean life?
State the statistical assumptions of this test Using the data set you have selected, select independent and dependent variables.
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