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A researcher conducts a hypothesis test to evaluate the effect of a treatment. The hypothesis test produces a z-score of z = -2.60. Assuming that the researcher is using a two-tailed test, what is the correct statistical decision? Explain your answer.
Use exponential smoothing to forcast Aug. income. Assume that the initial forecast for Feb. is $65,000. The smoothing constant selected is x=0.1
A random sample of 49 employees took a computer literacy test. The sample resulted in a mean score of 75 with a standard deviation of 21. Estimate the standard error of the mean.
Is there any significant relationship between gender and the variable IQcat? If so, what is it and is the mean exam grade significantly larger than 75?
Compare the effectiveness of three methods of teaching (IV). You plan to administer a standardized test (DV measured on an interval scale measuring knowledge acquisition) to the students in three classes with each class using a different teaching ..
A telephone survey utilized a sampling frame of 2000 numbers, and had a response rate of 25%. A question asked respondents if they preferred Brand 1, Brand 2, or Brand 3.
JBGHI demands a sample large enough to ensure an error of ± 2% with 90% confidence. What is the necessary sample size?
Which statement is true for a statistical study?
Test claim that mean responses are same for all populations of patients receiving either treatment and of either gender.
Analysis of data sets assignment
A fast food arrives at a fast drive through rest restaurant 6 minutes after it opens and then the arrival times for the next four customers in order are 3minutes, 8 minutes, 2 minute, and 5minutes.
What is the sampling distribution of sample means? What is the mean of the sampling distribution of sample means?
Find the probability distribution for X defined as the number of defective items drawn (Hint: You have to find P(X=0), P(X=1) and P(X=2). You may have to use both multiplicative and additive rules to find P (X=1)).
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