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The managers in a company’s East and West regions were rated on the basis of the company’s evaluation system. A researcher wishes to conduct a t-test of means to determine if there is a difference between the East and West regions. Perform this calculation.
Region Manager Rating Region Manager Rating
West 1 74 East 1 81
West 2 88 East 2 63
West 3 78 East 3 56
West 4 85 East 4 68
West 5 100 East 5 80
West 6 114 East 6 79
West 7 98 East 7 69
A total of 61,647 people responded to an Elle/ MSNBC.com survey. It was reported that 50% of the respondents were women and 50% men.
Find the mean for the random variable X, the number of students who work full time in sample of size 16. Please round your answer to two decimal places.
We want to test a hypothesis at the .01 level of significance. Based on your computations, would we reject or fail to reject the null hypothesis?
You know that all sociology majors study 2.5 hours per day with a standard deviation of 1.
Use graphical sensitivity analysis to find out range of probabilities of state of nature S1 for which each of decision alternatives has largest expected value.
Four homes are selected at random: What is the probability all four of the selected homes have a security system? (Round your answer to 4 decimal places.
If the test contains 250 questions, what is the probability that Julie will score 75% or lower? (Use the normal approximation to the sampling distribution to solve this problem.)
A national Retail Foundation survey found housholds intended to spend an average of $932 during the December holiday season. Assume that the survey included 850 households and that the standard deviation of the sample is $215.
Show the odds of any two individuals having the same birthday are slightly greater than 1:1 (1:.9732 actually).
Statisticians use terms like trial, outcome and success in a particular way in reference to probability. What do each of these three terms mean in this context?
What is the null hypothesis? Use a = 0.05 .
According to an IRS study, it takes an average of 330 minutes for taxpayers to prepare, copy, and electronically file a 1040 tax form. A consumer watchdog agency selects a random sample of 40 taxpayers and finds the standard deviation of the time ..
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